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75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// UNSUPPORTED: libcpp-no-concepts
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// template<class T>
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// concept default_initializable = constructible_from<T> &&
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// requires { T{}; } &&
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// is-default-initializable<T>;
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#include <concepts>
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#include <cassert>
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#include "test_macros.h"
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template<class T>
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concept brace_initializable = requires { T{}; };
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void test() {
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// LWG3149
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// Changed the concept from constructible_from<T>
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// to constructible_from<T> &&
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// requires { T{}; } && is-default-initializable <T>
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struct S0 { explicit S0() = default; };
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S0 x0;
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S0 y0{};
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static_assert(std::constructible_from<S0>);
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static_assert(brace_initializable<S0>);
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LIBCPP_STATIC_ASSERT(std::__default_initializable<S0>);
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static_assert(std::default_initializable<S0>);
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struct S1 { S0 x; }; // Note: aggregate
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S1 x1;
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S1 y1{}; // expected-error {{chosen constructor is explicit in copy-initialization}}
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static_assert(std::constructible_from<S1>);
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static_assert(!brace_initializable<S1>);
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LIBCPP_STATIC_ASSERT(std::__default_initializable<S1>);
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static_assert(!std::default_initializable<S1>);
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const int x2; // expected-error {{default initialization of an object of const type 'const int'}}
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const int y2{};
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static_assert(std::constructible_from<const int>);
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static_assert(brace_initializable<const int>);
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LIBCPP_STATIC_ASSERT(!std::__default_initializable<const int>);
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static_assert(!std::default_initializable<const int>);
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const int x3[1]; // expected-error-re {{default initialization of an object of const type 'const int{{[ ]*}}[1]'}}
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const int y3[1]{};
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static_assert(std::constructible_from<const int[1]>);
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static_assert(brace_initializable<const int[1]>);
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LIBCPP_STATIC_ASSERT(!std::__default_initializable<const int[1]>);
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static_assert(!std::default_initializable<const int[1]>);
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// Zero-length array extension
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const int x4[]; // expected-error {{definition of variable with array type needs an explicit size or an initializer}}
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const int y4[]{};
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static_assert(!std::constructible_from<const int[]>);
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static_assert(brace_initializable<const int[]>);
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LIBCPP_STATIC_ASSERT(!std::__default_initializable<const int[]>);
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static_assert(!std::default_initializable<const int[]>);
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}
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int main(int, char**) {
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test();
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return 0;
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}
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