forked from OSchip/llvm-project
890 lines
29 KiB
C++
890 lines
29 KiB
C++
// RUN: %clang_cc1 -triple i686-linux -fsyntax-only -verify -std=c++11 %s
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// This version of static_assert just requires a foldable value as the
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// expression, not an ICE.
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// FIXME: Once we implement the C++11 ICE rules, most uses of this here should
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// be converted to static_assert.
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#define static_assert_fold(expr, str) \
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static_assert(__builtin_constant_p(expr), "not an integral constant expression"); \
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static_assert(__builtin_constant_p(expr) ? expr : true, str)
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namespace StaticAssertFoldTest {
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int x;
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static_assert_fold(++x, "test"); // expected-error {{not an integral constant expression}}
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static_assert_fold(false, "test"); // expected-error {{test}}
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}
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// FIXME: support const T& parameters here.
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//template<typename T> constexpr T id(const T &t) { return t; }
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template<typename T> constexpr T id(T t) { return t; }
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// FIXME: support templates here.
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//template<typename T> constexpr T min(const T &a, const T &b) {
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// return a < b ? a : b;
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//}
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//template<typename T> constexpr T max(const T &a, const T &b) {
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// return a < b ? b : a;
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//}
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constexpr int min(const int &a, const int &b) { return a < b ? a : b; }
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constexpr int max(const int &a, const int &b) { return a < b ? b : a; }
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struct MemberZero {
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constexpr int zero() { return 0; }
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};
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namespace DerivedToVBaseCast {
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struct U { int n; };
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struct V : U { int n; };
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struct A : virtual V { int n; };
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struct Aa { int n; };
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struct B : virtual A, Aa {};
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struct C : virtual A, Aa {};
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struct D : B, C {};
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D d;
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constexpr B *p = &d;
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constexpr C *q = &d;
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static_assert_fold((void*)p != (void*)q, "");
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static_assert_fold((A*)p == (A*)q, "");
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static_assert_fold((Aa*)p != (Aa*)q, "");
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constexpr B &pp = d;
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constexpr C &qq = d;
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static_assert_fold((void*)&pp != (void*)&qq, "");
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static_assert_fold(&(A&)pp == &(A&)qq, "");
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static_assert_fold(&(Aa&)pp != &(Aa&)qq, "");
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constexpr V *v = p;
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constexpr V *w = q;
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constexpr V *x = (A*)p;
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static_assert_fold(v == w, "");
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static_assert_fold(v == x, "");
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static_assert_fold((U*)&d == p, "");
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static_assert_fold((U*)&d == q, "");
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static_assert_fold((U*)&d == v, "");
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static_assert_fold((U*)&d == w, "");
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static_assert_fold((U*)&d == x, "");
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struct X {};
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struct Y1 : virtual X {};
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struct Y2 : X {};
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struct Z : Y1, Y2 {};
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Z z;
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static_assert_fold((X*)(Y1*)&z != (X*)(Y2*)&z, "");
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}
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namespace ConstCast {
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constexpr int n1 = 0;
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constexpr int n2 = const_cast<int&>(n1);
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constexpr int *n3 = const_cast<int*>(&n1);
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constexpr int n4 = *const_cast<int*>(&n1);
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constexpr const int * const *n5 = const_cast<const int* const*>(&n3);
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constexpr int **n6 = const_cast<int**>(&n3);
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constexpr int n7 = **n5;
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constexpr int n8 = **n6;
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}
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namespace TemplateArgumentConversion {
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template<int n> struct IntParam {};
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using IntParam0 = IntParam<0>;
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// FIXME: This should be accepted once we implement the new ICE rules.
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using IntParam0 = IntParam<id(0)>; // expected-error {{not an integral constant expression}}
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using IntParam0 = IntParam<MemberZero().zero>; // expected-error {{did you mean to call it with no arguments?}} expected-error {{not an integral constant expression}}
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}
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namespace CaseStatements {
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void f(int n) {
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switch (n) {
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// FIXME: Produce the 'add ()' fixit for this.
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case MemberZero().zero: // desired-error {{did you mean to call it with no arguments?}} expected-error {{not an integer constant expression}}
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// FIXME: This should be accepted once we implement the new ICE rules.
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case id(1): // expected-error {{not an integer constant expression}}
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return;
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}
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}
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}
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extern int &Recurse1;
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int &Recurse2 = Recurse1, &Recurse1 = Recurse2;
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constexpr int &Recurse3 = Recurse2; // expected-error {{must be initialized by a constant expression}}
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namespace MemberEnum {
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struct WithMemberEnum {
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enum E { A = 42 };
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} wme;
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static_assert_fold(wme.A == 42, "");
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}
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namespace DefaultArguments {
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const int z = int();
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constexpr int Sum(int a = 0, const int &b = 0, const int *c = &z, char d = 0) {
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return a + b + *c + d;
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}
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const int four = 4;
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constexpr int eight = 8;
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constexpr const int twentyseven = 27;
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static_assert_fold(Sum() == 0, "");
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static_assert_fold(Sum(1) == 1, "");
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static_assert_fold(Sum(1, four) == 5, "");
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static_assert_fold(Sum(1, eight, &twentyseven) == 36, "");
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static_assert_fold(Sum(1, 2, &four, eight) == 15, "");
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}
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namespace Ellipsis {
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// Note, values passed through an ellipsis can't actually be used.
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constexpr int F(int a, ...) { return a; }
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static_assert_fold(F(0) == 0, "");
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static_assert_fold(F(1, 0) == 1, "");
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static_assert_fold(F(2, "test") == 2, "");
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static_assert_fold(F(3, &F) == 3, "");
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int k = 0;
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static_assert_fold(F(4, k) == 3, ""); // expected-error {{constant expression}}
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}
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namespace Recursion {
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constexpr int fib(int n) { return n > 1 ? fib(n-1) + fib(n-2) : n; }
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static_assert_fold(fib(11) == 89, "");
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constexpr int gcd_inner(int a, int b) {
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return b == 0 ? a : gcd_inner(b, a % b);
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}
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constexpr int gcd(int a, int b) {
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return gcd_inner(max(a, b), min(a, b));
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}
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static_assert_fold(gcd(1749237, 5628959) == 7, "");
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}
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namespace FunctionCast {
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// When folding, we allow functions to be cast to different types. Such
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// cast functions cannot be called, even if they're constexpr.
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constexpr int f() { return 1; }
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typedef double (*DoubleFn)();
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typedef int (*IntFn)();
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int a[(int)DoubleFn(f)()]; // expected-error {{variable length array}}
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int b[(int)IntFn(f)()]; // ok
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}
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namespace StaticMemberFunction {
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struct S {
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static constexpr int k = 42;
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static constexpr int f(int n) { return n * k + 2; }
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} s;
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constexpr int n = s.f(19);
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static_assert_fold(S::f(19) == 800, "");
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static_assert_fold(s.f(19) == 800, "");
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static_assert_fold(n == 800, "");
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constexpr int (*sf1)(int) = &S::f;
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constexpr int (*sf2)(int) = &s.f;
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constexpr const int *sk = &s.k;
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}
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namespace ParameterScopes {
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const int k = 42;
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constexpr const int &ObscureTheTruth(const int &a) { return a; }
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constexpr const int &MaybeReturnJunk(bool b, const int a) {
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return ObscureTheTruth(b ? a : k);
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}
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static_assert_fold(MaybeReturnJunk(false, 0) == 42, ""); // ok
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constexpr int a = MaybeReturnJunk(true, 0); // expected-error {{constant expression}}
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constexpr const int MaybeReturnNonstaticRef(bool b, const int a) {
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// If ObscureTheTruth returns a reference to 'a', the result is not a
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// constant expression even though 'a' is still in scope.
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return ObscureTheTruth(b ? a : k);
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}
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static_assert_fold(MaybeReturnNonstaticRef(false, 0) == 42, ""); // ok
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constexpr int b = MaybeReturnNonstaticRef(true, 0); // expected-error {{constant expression}}
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constexpr int InternalReturnJunk(int n) {
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// FIXME: We should reject this: it never produces a constant expression.
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return MaybeReturnJunk(true, n);
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}
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constexpr int n3 = InternalReturnJunk(0); // expected-error {{must be initialized by a constant expression}}
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constexpr int LToR(int &n) { return n; }
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constexpr int GrabCallersArgument(bool which, int a, int b) {
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return LToR(which ? b : a);
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}
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static_assert_fold(GrabCallersArgument(false, 1, 2) == 1, "");
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static_assert_fold(GrabCallersArgument(true, 4, 8) == 8, "");
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}
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namespace Pointers {
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constexpr int f(int n, const int *a, const int *b, const int *c) {
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return n == 0 ? 0 : *a + f(n-1, b, c, a);
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}
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const int x = 1, y = 10, z = 100;
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static_assert_fold(f(23, &x, &y, &z) == 788, "");
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constexpr int g(int n, int a, int b, int c) {
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return f(n, &a, &b, &c);
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}
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static_assert_fold(g(23, x, y, z) == 788, "");
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}
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namespace FunctionPointers {
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constexpr int Double(int n) { return 2 * n; }
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constexpr int Triple(int n) { return 3 * n; }
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constexpr int Twice(int (*F)(int), int n) { return F(F(n)); }
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constexpr int Quadruple(int n) { return Twice(Double, n); }
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constexpr auto Select(int n) -> int (*)(int) {
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return n == 2 ? &Double : n == 3 ? &Triple : n == 4 ? &Quadruple : 0;
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}
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constexpr int Apply(int (*F)(int), int n) { return F(n); }
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static_assert_fold(1 + Apply(Select(4), 5) + Apply(Select(3), 7) == 42, "");
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constexpr int Invalid = Apply(Select(0), 0); // expected-error {{must be initialized by a constant expression}}
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}
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namespace PointerComparison {
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int x, y;
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static_assert_fold(&x == &y, "false"); // expected-error {{false}}
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static_assert_fold(&x != &y, "");
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constexpr bool g1 = &x == &y;
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constexpr bool g2 = &x != &y;
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constexpr bool g3 = &x <= &y; // expected-error {{must be initialized by a constant expression}}
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constexpr bool g4 = &x >= &y; // expected-error {{must be initialized by a constant expression}}
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constexpr bool g5 = &x < &y; // expected-error {{must be initialized by a constant expression}}
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constexpr bool g6 = &x > &y; // expected-error {{must be initialized by a constant expression}}
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struct S { int x, y; } s;
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static_assert_fold(&s.x == &s.y, "false"); // expected-error {{false}}
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static_assert_fold(&s.x != &s.y, "");
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static_assert_fold(&s.x <= &s.y, "");
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static_assert_fold(&s.x >= &s.y, "false"); // expected-error {{false}}
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static_assert_fold(&s.x < &s.y, "");
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static_assert_fold(&s.x > &s.y, "false"); // expected-error {{false}}
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static_assert_fold(0 == &y, "false"); // expected-error {{false}}
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static_assert_fold(0 != &y, "");
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constexpr bool n3 = 0 <= &y; // expected-error {{must be initialized by a constant expression}}
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constexpr bool n4 = 0 >= &y; // expected-error {{must be initialized by a constant expression}}
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constexpr bool n5 = 0 < &y; // expected-error {{must be initialized by a constant expression}}
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constexpr bool n6 = 0 > &y; // expected-error {{must be initialized by a constant expression}}
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static_assert_fold(&x == 0, "false"); // expected-error {{false}}
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static_assert_fold(&x != 0, "");
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constexpr bool n9 = &x <= 0; // expected-error {{must be initialized by a constant expression}}
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constexpr bool n10 = &x >= 0; // expected-error {{must be initialized by a constant expression}}
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constexpr bool n11 = &x < 0; // expected-error {{must be initialized by a constant expression}}
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constexpr bool n12 = &x > 0; // expected-error {{must be initialized by a constant expression}}
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static_assert_fold(&x == &x, "");
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static_assert_fold(&x != &x, "false"); // expected-error {{false}}
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static_assert_fold(&x <= &x, "");
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static_assert_fold(&x >= &x, "");
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static_assert_fold(&x < &x, "false"); // expected-error {{false}}
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static_assert_fold(&x > &x, "false"); // expected-error {{false}}
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constexpr S* sptr = &s;
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// FIXME: This is not a constant expression; check we reject this and move this
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// test elsewhere.
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constexpr bool dyncast = sptr == dynamic_cast<S*>(sptr);
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extern char externalvar[];
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// FIXME: This is not a constant expression; check we reject this and move this
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// test elsewhere.
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constexpr bool constaddress = (void *)externalvar == (void *)0x4000UL; // expected-error {{must be initialized by a constant expression}}
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constexpr bool litaddress = "foo" == "foo"; // expected-error {{must be initialized by a constant expression}} expected-warning {{unspecified}}
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static_assert_fold(0 != "foo", "");
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}
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namespace MaterializeTemporary {
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constexpr int f(const int &r) { return r; }
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constexpr int n = f(1);
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constexpr bool same(const int &a, const int &b) { return &a == &b; }
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constexpr bool sameTemporary(const int &n) { return same(n, n); }
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static_assert_fold(n, "");
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static_assert_fold(!same(4, 4), "");
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static_assert_fold(same(n, n), "");
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static_assert_fold(sameTemporary(9), "");
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}
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constexpr int strcmp_ce(const char *p, const char *q) {
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return (!*p || *p != *q) ? *p - *q : strcmp_ce(p+1, q+1);
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}
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namespace StringLiteral {
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// FIXME: Refactor this once we support constexpr templates.
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constexpr int MangleChars(const char *p) {
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return *p + 3 * (*p ? MangleChars(p+1) : 0);
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}
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constexpr int MangleChars(const char16_t *p) {
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return *p + 3 * (*p ? MangleChars(p+1) : 0);
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}
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constexpr int MangleChars(const char32_t *p) {
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return *p + 3 * (*p ? MangleChars(p+1) : 0);
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}
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static_assert_fold(MangleChars("constexpr!") == 1768383, "");
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static_assert_fold(MangleChars(u"constexpr!") == 1768383, "");
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static_assert_fold(MangleChars(U"constexpr!") == 1768383, "");
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constexpr char c0 = "nought index"[0];
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constexpr char c1 = "nice index"[10];
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constexpr char c2 = "nasty index"[12]; // expected-error {{must be initialized by a constant expression}} expected-warning {{is past the end}}
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constexpr char c3 = "negative index"[-1]; // expected-error {{must be initialized by a constant expression}} expected-warning {{is before the beginning}}
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constexpr char c4 = ((char*)(int*)"no reinterpret_casts allowed")[14]; // expected-error {{must be initialized by a constant expression}}
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constexpr const char *p = "test" + 2;
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static_assert_fold(*p == 's', "");
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constexpr const char *max_iter(const char *a, const char *b) {
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return *a < *b ? b : a;
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}
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constexpr const char *max_element(const char *a, const char *b) {
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return (a+1 >= b) ? a : max_iter(a, max_element(a+1, b));
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}
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constexpr const char *begin(const char (&arr)[45]) { return arr; }
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constexpr const char *end(const char (&arr)[45]) { return arr + 45; }
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constexpr char str[] = "the quick brown fox jumped over the lazy dog";
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constexpr const char *max = max_element(begin(str), end(str));
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static_assert_fold(*max == 'z', "");
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static_assert_fold(max == str + 38, "");
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static_assert_fold(strcmp_ce("hello world", "hello world") == 0, "");
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static_assert_fold(strcmp_ce("hello world", "hello clang") > 0, "");
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static_assert_fold(strcmp_ce("constexpr", "test") < 0, "");
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static_assert_fold(strcmp_ce("", " ") < 0, "");
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}
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namespace Array {
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// FIXME: Use templates for these once we support constexpr templates.
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constexpr int Sum(const int *begin, const int *end) {
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return begin == end ? 0 : *begin + Sum(begin+1, end);
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}
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constexpr const int *begin(const int (&xs)[5]) { return xs; }
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constexpr const int *end(const int (&xs)[5]) { return xs + 5; }
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constexpr int xs[] = { 1, 2, 3, 4, 5 };
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constexpr int ys[] = { 5, 4, 3, 2, 1 };
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constexpr int sum_xs = Sum(begin(xs), end(xs));
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static_assert_fold(sum_xs == 15, "");
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constexpr int ZipFoldR(int (*F)(int x, int y, int c), int n,
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const int *xs, const int *ys, int c) {
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return n ? F(*xs, *ys, ZipFoldR(F, n-1, xs+1, ys+1, c)) : c;
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}
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constexpr int MulAdd(int x, int y, int c) { return x * y + c; }
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constexpr int InnerProduct = ZipFoldR(MulAdd, 5, xs, ys, 0);
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static_assert_fold(InnerProduct == 35, "");
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constexpr int SubMul(int x, int y, int c) { return (x - y) * c; }
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constexpr int DiffProd = ZipFoldR(SubMul, 2, xs+3, ys+3, 1);
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static_assert_fold(DiffProd == 8, "");
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static_assert_fold(ZipFoldR(SubMul, 3, xs+3, ys+3, 1), ""); // expected-error {{constant expression}}
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constexpr const int *p = xs + 3;
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constexpr int xs4 = p[1]; // ok
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constexpr int xs5 = p[2]; // expected-error {{constant expression}}
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constexpr int xs0 = p[-3]; // ok
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constexpr int xs_1 = p[-4]; // expected-error {{constant expression}}
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constexpr int zs[2][2][2][2] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
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static_assert_fold(zs[0][0][0][0] == 1, "");
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static_assert_fold(zs[1][1][1][1] == 16, "");
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static_assert_fold(zs[0][0][0][2] == 3, ""); // expected-error {{constant expression}}
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static_assert_fold((&zs[0][0][0][2])[-1] == 2, "");
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static_assert_fold(**(**(zs + 1) + 1) == 11, "");
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static_assert_fold(*(&(&(*(*&(&zs[2] - 1)[0] + 2 - 2))[2])[-1][-1] + 1) == 11, "");
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constexpr int arr[40] = { 1, 2, 3, [8] = 4 };
|
|
constexpr int SumNonzero(const int *p) {
|
|
return *p + (*p ? SumNonzero(p+1) : 0);
|
|
}
|
|
constexpr int CountZero(const int *p, const int *q) {
|
|
return p == q ? 0 : (*p == 0) + CountZero(p+1, q);
|
|
}
|
|
static_assert_fold(SumNonzero(arr) == 6, "");
|
|
static_assert_fold(CountZero(arr, arr + 40) == 36, "");
|
|
|
|
struct ArrayElem {
|
|
constexpr ArrayElem() : n(0) {}
|
|
int n;
|
|
constexpr int f() { return n; }
|
|
};
|
|
struct ArrayRVal {
|
|
constexpr ArrayRVal() {}
|
|
ArrayElem elems[10];
|
|
};
|
|
static_assert_fold(ArrayRVal().elems[3].f() == 0, "");
|
|
|
|
}
|
|
|
|
namespace DependentValues {
|
|
|
|
struct I { int n; typedef I V[10]; };
|
|
I::V x, y;
|
|
template<bool B> struct S {
|
|
int k;
|
|
void f() {
|
|
I::V &cells = B ? x : y;
|
|
I &i = cells[k];
|
|
switch (i.n) {}
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
namespace Class {
|
|
|
|
struct A { constexpr A(int a, int b) : k(a + b) {} int k; };
|
|
constexpr int fn(const A &a) { return a.k; }
|
|
static_assert_fold(fn(A(4,5)) == 9, "");
|
|
|
|
struct B { int n; int m; } constexpr b = { 0, b.n }; // expected-warning {{uninitialized}}
|
|
struct C {
|
|
constexpr C(C *this_) : m(42), n(this_->m) {} // ok
|
|
int m, n;
|
|
};
|
|
struct D {
|
|
C c;
|
|
constexpr D() : c(&c) {}
|
|
};
|
|
static_assert_fold(D().c.n == 42, "");
|
|
|
|
struct E {
|
|
constexpr E() : p(&p) {}
|
|
void *p;
|
|
};
|
|
constexpr const E &e1 = E(); // expected-error {{constant expression}}
|
|
// This is a constant expression if we elide the copy constructor call, and
|
|
// is not a constant expression if we don't! But we do, so it is.
|
|
// FIXME: The move constructor is not currently implicitly defined as constexpr.
|
|
// We notice this when evaluating an expression which uses it, but not when
|
|
// checking its initializer.
|
|
constexpr E e2 = E(); // unexpected-error {{constant expression}}
|
|
static_assert_fold(e2.p == &e2.p, ""); // unexpected-error {{constant expression}}
|
|
// FIXME: We don't pass through the fact that 'this' is ::e3 when checking the
|
|
// initializer of this declaration.
|
|
constexpr E e3; // unexpected-error {{constant expression}}
|
|
static_assert_fold(e3.p == &e3.p, "");
|
|
|
|
extern const class F f;
|
|
struct F {
|
|
constexpr F() : p(&f.p) {}
|
|
const void *p;
|
|
};
|
|
constexpr F f = F();
|
|
|
|
struct G {
|
|
struct T {
|
|
constexpr T(T *p) : u1(), u2(p) {}
|
|
union U1 {
|
|
constexpr U1() {}
|
|
int a, b = 42;
|
|
} u1;
|
|
union U2 {
|
|
constexpr U2(T *p) : c(p->u1.b) {}
|
|
int c, d;
|
|
} u2;
|
|
} t;
|
|
constexpr G() : t(&t) {}
|
|
} constexpr g;
|
|
|
|
static_assert_fold(g.t.u1.a == 42, ""); // expected-error {{constant expression}}
|
|
static_assert_fold(g.t.u1.b == 42, "");
|
|
static_assert_fold(g.t.u2.c == 42, "");
|
|
static_assert_fold(g.t.u2.d == 42, ""); // expected-error {{constant expression}}
|
|
|
|
struct S {
|
|
int a, b;
|
|
const S *p;
|
|
double d;
|
|
const char *q;
|
|
|
|
constexpr S(int n, const S *p) : a(5), b(n), p(p), d(n), q("hello") {}
|
|
};
|
|
|
|
S global(43, &global);
|
|
|
|
static_assert_fold(S(15, &global).b == 15, "");
|
|
|
|
constexpr bool CheckS(const S &s) {
|
|
return s.a == 5 && s.b == 27 && s.p == &global && s.d == 27. && s.q[3] == 'l';
|
|
}
|
|
static_assert_fold(CheckS(S(27, &global)), "");
|
|
|
|
struct Arr {
|
|
char arr[3];
|
|
constexpr Arr() : arr{'x', 'y', 'z'} {}
|
|
};
|
|
constexpr int hash(Arr &&a) {
|
|
return a.arr[0] + a.arr[1] * 0x100 + a.arr[2] * 0x10000;
|
|
}
|
|
constexpr int k = hash(Arr());
|
|
static_assert_fold(k == 0x007a7978, "");
|
|
|
|
|
|
struct AggregateInit {
|
|
const char &c;
|
|
int n;
|
|
double d;
|
|
int arr[5];
|
|
void *p;
|
|
};
|
|
|
|
constexpr AggregateInit agg1 = { "hello"[0] };
|
|
|
|
static_assert_fold(strcmp_ce(&agg1.c, "hello") == 0, "");
|
|
static_assert_fold(agg1.n == 0, "");
|
|
static_assert_fold(agg1.d == 0.0, "");
|
|
static_assert_fold(agg1.arr[-1] == 0, ""); // expected-error {{constant expression}}
|
|
static_assert_fold(agg1.arr[0] == 0, "");
|
|
static_assert_fold(agg1.arr[4] == 0, "");
|
|
static_assert_fold(agg1.arr[5] == 0, ""); // expected-error {{constant expression}}
|
|
static_assert_fold(agg1.p == nullptr, "");
|
|
|
|
namespace SimpleDerivedClass {
|
|
|
|
struct B {
|
|
constexpr B(int n) : a(n) {}
|
|
int a;
|
|
};
|
|
struct D : B {
|
|
constexpr D(int n) : B(n) {}
|
|
};
|
|
constexpr D d(3);
|
|
static_assert_fold(d.a == 3, "");
|
|
|
|
}
|
|
|
|
struct Bottom { constexpr Bottom() {} };
|
|
struct Base : Bottom {
|
|
constexpr Base(int a = 42, const char *b = "test") : a(a), b(b) {}
|
|
int a;
|
|
const char *b;
|
|
};
|
|
struct Base2 : Bottom {
|
|
constexpr Base2(const int &r) : r(r) {}
|
|
int q = 123;
|
|
// FIXME: When we track the global for which we are computing the initializer,
|
|
// use a reference here.
|
|
//const int &r;
|
|
int r;
|
|
};
|
|
struct Derived : Base, Base2 {
|
|
constexpr Derived() : Base(76), Base2(a) {}
|
|
int c = r + b[1];
|
|
};
|
|
|
|
constexpr bool operator==(const Base &a, const Base &b) {
|
|
return a.a == b.a && strcmp_ce(a.b, b.b) == 0;
|
|
}
|
|
|
|
constexpr Base base;
|
|
constexpr Base base2(76);
|
|
constexpr Derived derived;
|
|
static_assert_fold(derived.a == 76, "");
|
|
static_assert_fold(derived.b[2] == 's', "");
|
|
static_assert_fold(derived.c == 76 + 'e', "");
|
|
static_assert_fold(derived.q == 123, "");
|
|
static_assert_fold(derived.r == 76, "");
|
|
static_assert_fold(&derived.r == &derived.a, ""); // expected-error {{}}
|
|
|
|
static_assert_fold(!(derived == base), "");
|
|
static_assert_fold(derived == base2, "");
|
|
|
|
constexpr Bottom &bot1 = (Base&)derived;
|
|
constexpr Bottom &bot2 = (Base2&)derived;
|
|
static_assert_fold(&bot1 != &bot2, "");
|
|
|
|
constexpr Bottom *pb1 = (Base*)&derived;
|
|
constexpr Bottom *pb2 = (Base2*)&derived;
|
|
static_assert_fold(pb1 != pb2, "");
|
|
static_assert_fold(pb1 == &bot1, "");
|
|
static_assert_fold(pb2 == &bot2, "");
|
|
|
|
constexpr Base2 &fail = (Base2&)bot1; // expected-error {{constant expression}}
|
|
constexpr Base &fail2 = (Base&)*pb2; // expected-error {{constant expression}}
|
|
constexpr Base2 &ok2 = (Base2&)bot2;
|
|
static_assert_fold(&ok2 == &derived, "");
|
|
|
|
constexpr Base2 *pfail = (Base2*)pb1; // expected-error {{constant expression}}
|
|
constexpr Base *pfail2 = (Base*)&bot2; // expected-error {{constant expression}}
|
|
constexpr Base2 *pok2 = (Base2*)pb2;
|
|
static_assert_fold(pok2 == &derived, "");
|
|
static_assert_fold(&ok2 == pok2, "");
|
|
static_assert_fold((Base2*)(Derived*)(Base*)pb1 == pok2, "");
|
|
static_assert_fold((Derived*)(Base*)pb1 == (Derived*)pok2, "");
|
|
|
|
constexpr Base *nullB = 42 - 6 * 7;
|
|
static_assert_fold((Bottom*)nullB == 0, "");
|
|
static_assert_fold((Derived*)nullB == 0, "");
|
|
static_assert_fold((void*)(Bottom*)nullB == (void*)(Derived*)nullB, "");
|
|
|
|
}
|
|
|
|
namespace Temporaries {
|
|
|
|
struct S {
|
|
constexpr S() {}
|
|
constexpr int f();
|
|
};
|
|
struct T : S {
|
|
constexpr T(int n) : S(), n(n) {}
|
|
int n;
|
|
};
|
|
constexpr int S::f() {
|
|
// 'this' must be the postfix-expression in a class member access expression,
|
|
// so we can't just use
|
|
// return static_cast<T*>(this)->n;
|
|
return this->*(int(S::*))&T::n;
|
|
}
|
|
// The T temporary is implicitly cast to an S subobject, but we can recover the
|
|
// T full-object via a base-to-derived cast, or a derived-to-base-casted member
|
|
// pointer.
|
|
static_assert_fold(T(3).f() == 3, "");
|
|
|
|
constexpr int f(const S &s) {
|
|
return static_cast<const T&>(s).n;
|
|
}
|
|
constexpr int n = f(T(5));
|
|
static_assert_fold(f(T(5)) == 5, "");
|
|
|
|
}
|
|
|
|
namespace Union {
|
|
|
|
union U {
|
|
int a;
|
|
int b;
|
|
};
|
|
|
|
constexpr U u[4] = { { .a = 0 }, { .b = 1 }, { .a = 2 }, { .b = 3 } };
|
|
static_assert_fold(u[0].a == 0, "");
|
|
static_assert_fold(u[0].b, ""); // expected-error {{constant expression}}
|
|
static_assert_fold(u[1].b == 1, "");
|
|
static_assert_fold((&u[1].b)[1] == 2, ""); // expected-error {{constant expression}}
|
|
static_assert_fold(*(&(u[1].b) + 1 + 1) == 3, ""); // expected-error {{constant expression}}
|
|
static_assert_fold((&(u[1]) + 1 + 1)->b == 3, "");
|
|
|
|
}
|
|
|
|
namespace MemberPointer {
|
|
struct A {
|
|
constexpr A(int n) : n(n) {}
|
|
int n;
|
|
constexpr int f() { return n + 3; }
|
|
};
|
|
constexpr A a(7);
|
|
static_assert_fold(A(5).*&A::n == 5, "");
|
|
static_assert_fold((&a)->*&A::n == 7, "");
|
|
static_assert_fold((A(8).*&A::f)() == 11, "");
|
|
static_assert_fold(((&a)->*&A::f)() == 10, "");
|
|
|
|
struct B : A {
|
|
constexpr B(int n, int m) : A(n), m(m) {}
|
|
int m;
|
|
constexpr int g() { return n + m + 1; }
|
|
};
|
|
constexpr B b(9, 13);
|
|
static_assert_fold(B(4, 11).*&A::n == 4, "");
|
|
static_assert_fold(B(4, 11).*&B::m == 11, "");
|
|
static_assert_fold(B(4, 11).*(int(A::*))&B::m == 11, "");
|
|
static_assert_fold((&b)->*&A::n == 9, "");
|
|
static_assert_fold((&b)->*&B::m == 13, "");
|
|
static_assert_fold((&b)->*(int(A::*))&B::m == 13, "");
|
|
static_assert_fold((B(4, 11).*&A::f)() == 7, "");
|
|
static_assert_fold((B(4, 11).*&B::g)() == 16, "");
|
|
static_assert_fold((B(4, 11).*(int(A::*)()const)&B::g)() == 16, "");
|
|
static_assert_fold(((&b)->*&A::f)() == 12, "");
|
|
static_assert_fold(((&b)->*&B::g)() == 23, "");
|
|
static_assert_fold(((&b)->*(int(A::*)()const)&B::g)() == 23, "");
|
|
|
|
struct S {
|
|
constexpr S(int m, int n, int (S::*pf)() const, int S::*pn) :
|
|
m(m), n(n), pf(pf), pn(pn) {}
|
|
constexpr S() : m(), n(), pf(&S::f), pn(&S::n) {}
|
|
|
|
constexpr int f() { return this->*pn; }
|
|
virtual int g() const;
|
|
|
|
int m, n;
|
|
int (S::*pf)() const;
|
|
int S::*pn;
|
|
};
|
|
|
|
constexpr int S::*pm = &S::m;
|
|
constexpr int S::*pn = &S::n;
|
|
constexpr int (S::*pf)() const = &S::f;
|
|
constexpr int (S::*pg)() const = &S::g;
|
|
|
|
constexpr S s(2, 5, &S::f, &S::m);
|
|
|
|
static_assert_fold((s.*&S::f)() == 2, "");
|
|
static_assert_fold((s.*s.pf)() == 2, "");
|
|
|
|
template<int n> struct T : T<n-1> {};
|
|
template<> struct T<0> { int n; };
|
|
template<> struct T<30> : T<29> { int m; };
|
|
|
|
T<17> t17;
|
|
T<30> t30;
|
|
|
|
constexpr int (T<10>::*deepn) = &T<0>::n;
|
|
static_assert_fold(&(t17.*deepn) == &t17.n, "");
|
|
|
|
constexpr int (T<15>::*deepm) = (int(T<10>::*))&T<30>::m;
|
|
constexpr int *pbad = &(t17.*deepm); // expected-error {{constant expression}}
|
|
static_assert_fold(&(t30.*deepm) == &t30.m, "");
|
|
|
|
constexpr T<5> *p17_5 = &t17;
|
|
constexpr T<13> *p17_13 = (T<13>*)p17_5;
|
|
constexpr T<23> *p17_23 = (T<23>*)p17_13; // expected-error {{constant expression}}
|
|
static_assert_fold(&(p17_5->*(int(T<3>::*))deepn) == &t17.n, "");
|
|
static_assert_fold(&(p17_13->*deepn) == &t17.n, "");
|
|
constexpr int *pbad2 = &(p17_13->*(int(T<9>::*))deepm); // expected-error {{constant expression}}
|
|
|
|
constexpr T<5> *p30_5 = &t30;
|
|
constexpr T<23> *p30_23 = (T<23>*)p30_5;
|
|
constexpr T<13> *p30_13 = p30_23;
|
|
static_assert_fold(&(p30_5->*(int(T<3>::*))deepn) == &t30.n, "");
|
|
static_assert_fold(&(p30_13->*deepn) == &t30.n, "");
|
|
static_assert_fold(&(p30_23->*deepn) == &t30.n, "");
|
|
static_assert_fold(&(p30_5->*(int(T<2>::*))deepm) == &t30.m, "");
|
|
static_assert_fold(&(((T<17>*)p30_13)->*deepm) == &t30.m, "");
|
|
static_assert_fold(&(p30_23->*deepm) == &t30.m, "");
|
|
}
|
|
|
|
namespace ArrayBaseDerived {
|
|
|
|
struct Base {
|
|
constexpr Base() {}
|
|
int n = 0;
|
|
};
|
|
struct Derived : Base {
|
|
constexpr Derived() {}
|
|
constexpr const int *f() { return &n; }
|
|
};
|
|
|
|
constexpr Derived a[10];
|
|
constexpr Derived *pd3 = const_cast<Derived*>(&a[3]);
|
|
constexpr Base *pb3 = const_cast<Derived*>(&a[3]);
|
|
static_assert_fold(pb3 == pd3, "");
|
|
|
|
// pb3 does not point to an array element.
|
|
constexpr Base *pb4 = pb3 + 1; // ok, one-past-the-end pointer.
|
|
constexpr int pb4n = pb4->n; // expected-error {{constant expression}}
|
|
constexpr Base *err_pb5 = pb3 + 2; // FIXME: reject this.
|
|
constexpr int err_pb5n = err_pb5->n; // expected-error {{constant expression}}
|
|
constexpr Base *err_pb2 = pb3 - 1; // FIXME: reject this.
|
|
constexpr int err_pb2n = err_pb2->n; // expected-error {{constant expression}}
|
|
constexpr Base *pb3a = pb4 - 1;
|
|
|
|
// pb4 does not point to a Derived.
|
|
constexpr Derived *err_pd4 = (Derived*)pb4; // expected-error {{constant expression}}
|
|
constexpr Derived *pd3a = (Derived*)pb3a;
|
|
constexpr int pd3n = pd3a->n;
|
|
|
|
// pd3a still points to the Derived array.
|
|
constexpr Derived *pd6 = pd3a + 3;
|
|
static_assert_fold(pd6 == &a[6], "");
|
|
constexpr Derived *pd9 = pd6 + 3;
|
|
constexpr Derived *pd10 = pd6 + 4;
|
|
constexpr int pd9n = pd9->n; // ok
|
|
constexpr int err_pd10n = pd10->n; // expected-error {{constant expression}}
|
|
constexpr int pd0n = pd10[-10].n;
|
|
constexpr int err_pdminus1n = pd10[-11].n; // expected-error {{constant expression}}
|
|
|
|
constexpr Base *pb9 = pd9;
|
|
constexpr const int *(Base::*pfb)() const =
|
|
static_cast<const int *(Base::*)() const>(&Derived::f);
|
|
static_assert_fold((pb9->*pfb)() == &a[9].n, "");
|
|
}
|
|
|
|
namespace Complex {
|
|
|
|
class complex {
|
|
int re, im;
|
|
public:
|
|
constexpr complex(int re = 0, int im = 0) : re(re), im(im) {}
|
|
constexpr complex(const complex &o) : re(o.re), im(o.im) {}
|
|
constexpr complex operator-() const { return complex(-re, -im); }
|
|
friend constexpr complex operator+(const complex &l, const complex &r) {
|
|
return complex(l.re + r.re, l.im + r.im);
|
|
}
|
|
friend constexpr complex operator-(const complex &l, const complex &r) {
|
|
return l + -r;
|
|
}
|
|
friend constexpr complex operator*(const complex &l, const complex &r) {
|
|
return complex(l.re * r.re - l.im * r.im, l.re * r.im + l.im * r.re);
|
|
}
|
|
friend constexpr bool operator==(const complex &l, const complex &r) {
|
|
return l.re == r.re && l.im == r.im;
|
|
}
|
|
constexpr bool operator!=(const complex &r) const {
|
|
return re != r.re || im != r.im;
|
|
}
|
|
constexpr int real() const { return re; }
|
|
constexpr int imag() const { return im; }
|
|
};
|
|
|
|
constexpr complex i = complex(0, 1);
|
|
constexpr complex k = (3 + 4*i) * (6 - 4*i);
|
|
static_assert_fold(complex(1,0).real() == 1, "");
|
|
static_assert_fold(complex(1,0).imag() == 0, "");
|
|
static_assert_fold(((complex)1).imag() == 0, "");
|
|
static_assert_fold(k.real() == 34, "");
|
|
static_assert_fold(k.imag() == 12, "");
|
|
static_assert_fold(k - 34 == 12*i, "");
|
|
static_assert_fold((complex)1 == complex(1), "");
|
|
static_assert_fold((complex)1 != complex(0, 1), "");
|
|
static_assert_fold(complex(1) == complex(1), "");
|
|
static_assert_fold(complex(1) != complex(0, 1), "");
|
|
constexpr complex makeComplex(int re, int im) { return complex(re, im); }
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static_assert_fold(makeComplex(1,0) == complex(1), "");
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static_assert_fold(makeComplex(1,0) != complex(0, 1), "");
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class complex_wrap : public complex {
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public:
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constexpr complex_wrap(int re, int im = 0) : complex(re, im) {}
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constexpr complex_wrap(const complex_wrap &o) : complex(o) {}
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};
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static_assert_fold((complex_wrap)1 == complex(1), "");
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static_assert_fold((complex)1 != complex_wrap(0, 1), "");
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static_assert_fold(complex(1) == complex_wrap(1), "");
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static_assert_fold(complex_wrap(1) != complex(0, 1), "");
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constexpr complex_wrap makeComplexWrap(int re, int im) {
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return complex_wrap(re, im);
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}
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static_assert_fold(makeComplexWrap(1,0) == complex(1), "");
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static_assert_fold(makeComplexWrap(1,0) != complex(0, 1), "");
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}
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