124 lines
3.8 KiB
C++
124 lines
3.8 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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// <array>
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// implicitly generated array constructors / assignment operators
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#include <array>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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// std::array is explicitly allowed to be initialized with A a = { init-list };.
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// Disable the missing braces warning for this reason.
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#include "disable_missing_braces_warning.h"
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// In C++03 the copy assignment operator is not deleted when the implicitly
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// generated operator would be ill-formed; like in the case of a struct with a
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// const member.
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#if TEST_STD_VER < 11
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# define TEST_NOT_COPY_ASSIGNABLE(T) ((void)0)
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#else
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# define TEST_NOT_COPY_ASSIGNABLE(T) static_assert(!std::is_copy_assignable<T>::value, "")
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#endif
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struct NoDefault {
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TEST_CONSTEXPR NoDefault(int) { }
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};
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struct NonTrivialCopy {
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TEST_CONSTEXPR NonTrivialCopy() { }
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TEST_CONSTEXPR NonTrivialCopy(NonTrivialCopy const&) { }
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TEST_CONSTEXPR_CXX14 NonTrivialCopy& operator=(NonTrivialCopy const&) { return *this; }
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};
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TEST_CONSTEXPR_CXX14 bool tests()
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{
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{
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typedef std::array<double, 3> Array;
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Array array = {1.1, 2.2, 3.3};
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Array copy = array;
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copy = array;
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static_assert(std::is_copy_constructible<Array>::value, "");
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static_assert(std::is_copy_assignable<Array>::value, "");
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}
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{
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typedef std::array<double const, 3> Array;
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Array array = {1.1, 2.2, 3.3};
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Array copy = array; (void)copy;
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static_assert(std::is_copy_constructible<Array>::value, "");
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TEST_NOT_COPY_ASSIGNABLE(Array);
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}
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{
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typedef std::array<double, 0> Array;
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Array array = {};
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Array copy = array;
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copy = array;
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static_assert(std::is_copy_constructible<Array>::value, "");
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static_assert(std::is_copy_assignable<Array>::value, "");
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}
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{
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// const arrays of size 0 should disable the implicit copy assignment operator.
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typedef std::array<double const, 0> Array;
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Array array = {};
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Array copy = array; (void)copy;
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static_assert(std::is_copy_constructible<Array>::value, "");
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TEST_NOT_COPY_ASSIGNABLE(Array);
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}
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{
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typedef std::array<NoDefault, 0> Array;
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Array array = {};
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Array copy = array;
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copy = array;
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static_assert(std::is_copy_constructible<Array>::value, "");
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static_assert(std::is_copy_assignable<Array>::value, "");
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}
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{
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typedef std::array<NoDefault const, 0> Array;
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Array array = {};
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Array copy = array; (void)copy;
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static_assert(std::is_copy_constructible<Array>::value, "");
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TEST_NOT_COPY_ASSIGNABLE(Array);
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}
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// Make sure we can implicitly copy a std::array of a non-trivially copyable type
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{
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typedef std::array<NonTrivialCopy, 0> Array;
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Array array = {};
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Array copy = array;
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copy = array;
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static_assert(std::is_copy_constructible<Array>::value, "");
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}
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{
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typedef std::array<NonTrivialCopy, 1> Array;
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Array array = {};
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Array copy = array;
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copy = array;
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static_assert(std::is_copy_constructible<Array>::value, "");
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}
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{
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typedef std::array<NonTrivialCopy, 2> Array;
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Array array = {};
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Array copy = array;
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copy = array;
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static_assert(std::is_copy_constructible<Array>::value, "");
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}
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return true;
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}
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int main(int, char**)
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{
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tests();
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#if TEST_STD_VER >= 14
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static_assert(tests(), "");
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#endif
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return 0;
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}
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