forked from OSchip/llvm-project
346 lines
9.2 KiB
C++
346 lines
9.2 KiB
C++
// RUN: %clang_cc1 -std=c++98 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
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// RUN: %clang_cc1 -std=c++11 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
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// RUN: %clang_cc1 -std=c++14 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
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// RUN: %clang_cc1 -std=c++1z %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
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#if __cplusplus < 201103L
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// expected-no-diagnostics
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#endif
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namespace dr1460 { // dr1460: 3.5
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#if __cplusplus >= 201103L
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namespace DRExample {
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union A {
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union {};
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union {};
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constexpr A() {}
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};
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constexpr A a = A();
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union B {
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union {};
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union {};
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constexpr B() = default;
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};
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constexpr B b = B();
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union C {
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union {};
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union {};
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};
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constexpr C c = C();
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#if __cplusplus > 201103L
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constexpr void f() { C c; }
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static_assert((f(), true), "");
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#endif
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}
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union A {};
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union B { int n; }; // expected-note +{{here}}
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union C { int n = 0; };
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struct D { union {}; };
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struct E { union { int n; }; }; // expected-note +{{here}}
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struct F { union { int n = 0; }; };
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struct X {
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friend constexpr A::A() noexcept;
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friend constexpr B::B() noexcept; // expected-error {{follows non-constexpr declaration}}
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friend constexpr C::C() noexcept;
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friend constexpr D::D() noexcept;
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friend constexpr E::E() noexcept; // expected-error {{follows non-constexpr declaration}}
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friend constexpr F::F() noexcept;
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};
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// These are OK, because value-initialization doesn't actually invoke the
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// constructor.
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constexpr A a = A();
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constexpr B b = B();
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constexpr C c = C();
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constexpr D d = D();
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constexpr E e = E();
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constexpr F f = F();
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namespace Defaulted {
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union A { constexpr A() = default; };
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union B { int n; constexpr B() = default; }; // expected-error {{not constexpr}}
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union C { int n = 0; constexpr C() = default; };
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struct D { union {}; constexpr D() = default; };
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struct E { union { int n; }; constexpr E() = default; }; // expected-error {{not constexpr}}
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struct F { union { int n = 0; }; constexpr F() = default; };
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struct G { union { int n = 0; }; union { int m; }; constexpr G() = default; }; // expected-error {{not constexpr}}
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struct H {
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union {
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int n = 0;
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};
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union { // expected-note 2{{member not initialized}}
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int m;
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};
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constexpr H() {} // expected-error {{must initialize all members}}
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constexpr H(bool) : m(1) {}
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constexpr H(char) : n(1) {} // expected-error {{must initialize all members}}
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constexpr H(double) : m(1), n(1) {}
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};
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}
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#if __cplusplus > 201103L
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template<typename T> constexpr bool check() {
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T t; // expected-note-re 2{{non-constexpr constructor '{{[BE]}}'}}
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return true;
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}
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static_assert(check<A>(), "");
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static_assert(check<B>(), ""); // expected-error {{constant}} expected-note {{in call}}
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static_assert(check<C>(), "");
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static_assert(check<D>(), "");
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static_assert(check<E>(), ""); // expected-error {{constant}} expected-note {{in call}}
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static_assert(check<F>(), "");
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#endif
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union G {
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int a = 0; // expected-note {{previous initialization is here}}
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int b = 0; // expected-error {{initializing multiple members of union}}
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};
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union H {
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union {
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int a = 0; // expected-note {{previous initialization is here}}
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};
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union {
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int b = 0; // expected-error {{initializing multiple members of union}}
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};
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};
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struct I {
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union {
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int a = 0; // expected-note {{previous initialization is here}}
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int b = 0; // expected-error {{initializing multiple members of union}}
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};
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};
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struct J {
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union { int a = 0; };
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union { int b = 0; };
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};
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namespace Overriding {
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struct A {
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int a = 1, b, c = 3;
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constexpr A() : b(2) {}
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};
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static_assert(A().a == 1 && A().b == 2 && A().c == 3, "");
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union B {
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int a, b = 2, c;
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constexpr B() : a(1) {}
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constexpr B(char) : b(4) {}
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constexpr B(int) : c(3) {}
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constexpr B(const char*) {}
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};
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static_assert(B().a == 1, "");
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static_assert(B().b == 2, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(B('x').a == 0, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(B('x').b == 4, "");
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static_assert(B(123).b == 2, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(B(123).c == 3, "");
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static_assert(B("").a == 1, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(B("").b == 2, "");
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static_assert(B("").c == 3, ""); // expected-error {{constant}} expected-note {{read of}}
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struct C {
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union { int a, b = 2, c; };
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union { int d, e = 5, f; };
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constexpr C() : a(1) {}
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constexpr C(char) : c(3) {}
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constexpr C(int) : d(4) {}
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constexpr C(float) : f(6) {}
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constexpr C(const char*) {}
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};
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static_assert(C().a == 1, "");
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static_assert(C().b == 2, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(C().d == 4, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(C().e == 5, "");
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static_assert(C('x').b == 2, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(C('x').c == 3, "");
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static_assert(C('x').d == 4, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(C('x').e == 5, "");
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static_assert(C(1).b == 2, "");
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static_assert(C(1).c == 3, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(C(1).d == 4, "");
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static_assert(C(1).e == 5, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(C(1.f).b == 2, "");
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static_assert(C(1.f).c == 3, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(C(1.f).e == 5, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(C(1.f).f == 6, "");
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static_assert(C("").a == 1, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(C("").b == 2, "");
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static_assert(C("").c == 3, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(C("").d == 4, ""); // expected-error {{constant}} expected-note {{read of}}
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static_assert(C("").e == 5, "");
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static_assert(C("").f == 6, ""); // expected-error {{constant}} expected-note {{read of}}
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struct D;
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extern const D d;
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struct D {
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int a;
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union {
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int b = const_cast<D&>(d).a = 1; // not evaluated
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int c;
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};
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constexpr D() : a(0), c(0) {}
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};
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constexpr D d {};
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static_assert(d.a == 0, "");
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}
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#endif
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}
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#if __cplusplus >= 201103L
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namespace std {
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typedef decltype(sizeof(int)) size_t;
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// libc++'s implementation
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template <class _E>
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class initializer_list
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{
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const _E* __begin_;
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size_t __size_;
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initializer_list(const _E* __b, size_t __s)
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: __begin_(__b), __size_(__s) {}
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public:
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typedef _E value_type;
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typedef const _E& reference;
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typedef const _E& const_reference;
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typedef size_t size_type;
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typedef const _E* iterator;
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typedef const _E* const_iterator;
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initializer_list() : __begin_(nullptr), __size_(0) {}
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size_t size() const {return __size_;}
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const _E* begin() const {return __begin_;}
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const _E* end() const {return __begin_ + __size_;}
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};
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} // std
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namespace dr1467 { // dr1467: 3.7 c++11
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// List-initialization of aggregate from same-type object
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namespace basic0 {
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struct S {
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int i = 42;
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};
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S a;
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S b(a);
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S c{a};
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struct SS : public S { } x;
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S y(x);
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S z{x};
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} // basic0
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namespace basic1 {
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struct S {
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int i{42};
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};
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S a;
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S b(a);
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S c{a};
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struct SS : public S { } x;
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S y(x);
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S z{x};
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} // basic1
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namespace basic2 {
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struct S {
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int i = {42};
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};
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S a;
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S b(a);
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S c{a};
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struct SS : public S { } x;
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S y(x);
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S z{x};
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} // basic2
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namespace dr_example {
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struct OK {
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OK() = default;
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OK(const OK&) = default;
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OK(int) { }
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};
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OK ok;
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OK ok2{ok};
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struct X {
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X() = default;
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X(const X&) = default;
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};
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X x;
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X x2{x};
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} // dr_example
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namespace nonaggregate {
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struct NonAggregate {
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NonAggregate() {}
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};
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struct WantsIt {
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WantsIt(NonAggregate);
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};
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void f(NonAggregate);
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void f(WantsIt);
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void test1() {
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NonAggregate n;
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f({n});
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}
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void test2() {
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NonAggregate x;
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NonAggregate y{x};
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NonAggregate z{{x}};
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}
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} // nonaggregate
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namespace SelfInitIsNotListInit {
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struct S {
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S();
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explicit S(S &);
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S(const S &);
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};
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S s1;
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S s2 = {s1}; // ok, not list-initialization so we pick the non-explicit constructor
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}
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struct NestedInit { int a, b, c; };
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NestedInit ni[1] = {{NestedInit{1, 2, 3}}};
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namespace NestedInit2 {
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struct Pair { int a, b; };
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struct TwoPairs { TwoPairs(Pair, Pair); };
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struct Value { Value(Pair); Value(TwoPairs); };
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void f() { Value{{{1,2},{3,4}}}; }
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}
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} // dr1467
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namespace dr1490 { // dr1490: 3.7 c++11
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// List-initialization from a string literal
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char s[4]{"abc"}; // Ok
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std::initializer_list<char>{"abc"}; // expected-error {{expected unqualified-id}}}
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} // dr190
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#endif
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