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97 lines
2.6 KiB
97 lines
2.6 KiB
// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++11
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// Implicitly-defined default constructors are constexpr if the implicit
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// definition would be.
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struct NonConstexpr1 { // expected-note {{here}}
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int a;
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};
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struct NonConstexpr2 { // expected-note {{here}}
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NonConstexpr1 nl;
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};
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struct NonConstexpr2a : NonConstexpr1 { };
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constexpr NonConstexpr1 nc1 = NonConstexpr1(); // ok, does not call constructor
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constexpr NonConstexpr2 nc2 = NonConstexpr2(); // ok, does not call constructor
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constexpr NonConstexpr2a nc2a = NonConstexpr2a(); // ok, does not call constructor
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constexpr int nc2_a = NonConstexpr2().nl.a; // ok
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constexpr int nc2a_a = NonConstexpr2a().a; // ok
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struct Helper {
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friend constexpr NonConstexpr1::NonConstexpr1(); // expected-error {{follows non-constexpr declaration}}
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friend constexpr NonConstexpr2::NonConstexpr2(); // expected-error {{follows non-constexpr declaration}}
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};
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struct Constexpr1 {};
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constexpr Constexpr1 c1 = Constexpr1(); // ok
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struct NonConstexpr3 : virtual Constexpr1 {}; // expected-note {{struct with virtual base}} expected-note {{declared here}}
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constexpr NonConstexpr3 nc3 = NonConstexpr3(); // expected-error {{non-literal type 'const NonConstexpr3'}}
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struct Constexpr2 {
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int a = 0;
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};
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constexpr Constexpr2 c2 = Constexpr2(); // ok
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int n;
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struct Member {
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Member() : a(n) {}
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constexpr Member(int&a) : a(a) {}
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int &a;
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};
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struct NonConstexpr4 { // expected-note {{here}}
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Member m;
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};
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constexpr NonConstexpr4 nc4 = NonConstexpr4(); // expected-error {{constant expression}} expected-note {{non-constexpr constructor 'NonConstexpr4'}}
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struct Constexpr3 {
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constexpr Constexpr3() : m(n) {}
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Member m;
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};
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constexpr Constexpr3 c3 = Constexpr3(); // ok
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struct Constexpr4 {
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Constexpr3 m;
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};
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constexpr Constexpr4 c4 = Constexpr4(); // ok
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// This rule breaks some legal C++98 programs!
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struct A {}; // expected-note {{here}}
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struct B {
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friend A::A(); // expected-error {{non-constexpr declaration of 'A' follows constexpr declaration}}
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};
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namespace UnionCtors {
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union A { // expected-note {{here}}
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int a;
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int b;
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};
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union B {
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int a;
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int b = 5;
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};
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union C {
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int a = 5;
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int b;
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};
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struct D {
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union {
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int a = 5;
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int b;
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};
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union {
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int c;
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int d = 5;
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};
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};
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struct E { // expected-note {{here}}
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union {
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int a;
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int b;
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};
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};
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struct Test {
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friend constexpr A::A() noexcept; // expected-error {{follows non-constexpr declaration}}
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friend constexpr B::B() noexcept;
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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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};
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}
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