dr18xx.cpp
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// RUN: %clang_cc1 -std=c++98 -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++11 -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++14 -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++17 -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++2a -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
#if __cplusplus < 201103L
// expected-error@+1 {{variadic macro}}
#define static_assert(...) __extension__ _Static_assert(__VA_ARGS__)
#endif
namespace dr1813 { // dr1813: 7
struct B { int i; };
struct C : B {};
struct D : C {};
struct E : D { char : 4; };
static_assert(__is_standard_layout(B), "");
static_assert(__is_standard_layout(C), "");
static_assert(__is_standard_layout(D), "");
static_assert(!__is_standard_layout(E), "");
struct Q {};
struct S : Q {};
struct T : Q {};
struct U : S, T {};
static_assert(__is_standard_layout(Q), "");
static_assert(__is_standard_layout(S), "");
static_assert(__is_standard_layout(T), "");
static_assert(!__is_standard_layout(U), "");
}
namespace dr1815 { // dr1815: no
#if __cplusplus >= 201402L
// FIXME: needs codegen test
struct A { int &&r = 0; }; // expected-note {{default member init}}
A a = {}; // FIXME expected-warning {{not supported}}
struct B { int &&r = 0; }; // expected-error {{binds to a temporary}} expected-note {{default member init}}
B b; // expected-note {{here}}
#endif
}
namespace dr1872 { // dr1872: 9
#if __cplusplus >= 201103L
template<typename T> struct A : T {
constexpr int f() const { return 0; }
};
struct X {};
struct Y { virtual int f() const; };
struct Z : virtual X {};
constexpr int x = A<X>().f();
constexpr int y = A<Y>().f();
#if __cplusplus <= 201703L
// expected-error@-2 {{constant expression}} expected-note@-2 {{call to virtual function}}
#else
static_assert(y == 0);
#endif
// Note, this is invalid even though it would not use virtual dispatch.
constexpr int y2 = A<Y>().A<Y>::f();
#if __cplusplus <= 201703L
// expected-error@-2 {{constant expression}} expected-note@-2 {{call to virtual function}}
#else
static_assert(y == 0);
#endif
constexpr int z = A<Z>().f(); // expected-error {{constant expression}} expected-note {{non-literal type}}
#endif
}
namespace dr1881 { // dr1881: 7
struct A { int a : 4; };
struct B : A { int b : 3; };
static_assert(__is_standard_layout(A), "");
static_assert(!__is_standard_layout(B), "");
struct C { int : 0; };
struct D : C { int : 0; };
static_assert(__is_standard_layout(C), "");
static_assert(!__is_standard_layout(D), "");
}
void dr1891() { // dr1891: 4
#if __cplusplus >= 201103L
int n;
auto a = []{}; // expected-note 0-4{{}}
auto b = [=]{ return n; }; // expected-note 0-4{{}}
typedef decltype(a) A;
typedef decltype(b) B;
static_assert(!__has_trivial_constructor(A), "");
#if __cplusplus > 201703L
// expected-error@-2 {{failed}}
#endif
static_assert(!__has_trivial_constructor(B), "");
// C++20 allows default construction for non-capturing lambdas (P0624R2).
A x;
#if __cplusplus <= 201703L
// expected-error@-2 {{no matching constructor}}
#endif
B y; // expected-error {{no matching constructor}}
// C++20 allows assignment for non-capturing lambdas (P0624R2).
a = a;
a = static_cast<A&&>(a);
#if __cplusplus <= 201703L
// expected-error@-3 {{copy assignment operator is implicitly deleted}}
// expected-error@-3 {{copy assignment operator is implicitly deleted}}
#endif
b = b; // expected-error {{copy assignment operator is implicitly deleted}}
b = static_cast<B&&>(b); // expected-error {{copy assignment operator is implicitly deleted}}
#endif
}