forked from OSchip/llvm-project
63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
// RUN: %clang_cc1 %s -Wno-uninitialized -std=c++17 -fsyntax-only -verify
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struct A {
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constexpr A() : a(b + 1), b(a + 1) {} // expected-note 5{{outside its lifetime}}
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int a;
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int b;
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};
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struct B { // expected-note {{in call to 'A()'}}
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A a;
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};
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constexpr A a1; // expected-error {{constant expression}} expected-note {{in call to 'A()'}}
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constexpr A a2 = A(); // expected-error {{constant expression}} expected-note {{in call to 'A()'}}
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void f() {
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constexpr A a; // expected-error {{constant expression}} expected-note {{in call to 'A()'}}
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}
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constexpr B b1; // expected-error {{constant expression}} expected-note {{in call to 'B()'}}
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constexpr B b2 = B(); // ok
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static_assert(b2.a.a == 1, "");
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static_assert(b2.a.b == 2, "");
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struct C {
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int c;
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};
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struct D : C { int d; };
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constexpr C c1; // expected-error {{without a user-provided default constructor}}
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constexpr C c2 = C(); // ok
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constexpr D d1; // expected-error {{without a user-provided default constructor}}
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constexpr D d2 = D(); // ok with DR1452
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static_assert(D().c == 0, "");
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static_assert(D().d == 0, "");
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struct V : virtual C {};
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template<typename T> struct Z : T {
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constexpr Z() : V() {}
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};
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constexpr int n = Z<V>().c; // expected-error {{constant expression}} expected-note {{non-literal type 'Z<V>'}}
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struct E { // expected-note {{in call to 'A()'}}
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A a[2];
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};
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constexpr E e1; // expected-error {{constant expression}} expected-note {{in call to 'E()'}}
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constexpr E e2 = E();
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static_assert(e2.a[0].a == 1, "");
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static_assert(e2.a[0].b == 2, "");
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static_assert(e2.a[1].a == 1, "");
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static_assert(e2.a[1].b == 2, "");
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namespace InvalidDeclInsideConstExpr {
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template <int a> struct i; // expected-note {{template is declared here}}
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template <> struct i<0> {};
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template <int x> constexpr auto c() {
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// i<x> is valid, but it might be incomplete. g would be invalid in that case.
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i<x> g; // expected-error {{implicit instantiation of undefined template 'InvalidDeclInsideConstExpr::i<1>'}}
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return 0;
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}
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auto y = c<1>(); // expected-note {{in instantiation of function template specialization 'InvalidDeclInsideConstExpr::c<1>' requested here}}
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auto x = c<0>(); // this is valid.
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}
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