122 lines
2.8 KiB
C++
122 lines
2.8 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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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// <span>
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// template<class OtherElementType, size_t OtherExtent>
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// constexpr span(const span<OtherElementType, OtherExtent>& s) noexcept;
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//
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// Remarks: This constructor shall not participate in overload resolution unless:
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// Extent == dynamic_extent || Extent == OtherExtent is true, and
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// OtherElementType(*)[] is convertible to ElementType(*)[].
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#include <span>
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#include <cassert>
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#include <string>
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#include "test_macros.h"
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template <class T, class From>
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TEST_CONSTEXPR_CXX20 void check() {
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// dynamic -> dynamic
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{
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{
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std::span<From> from;
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std::span<T> span{from};
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ASSERT_NOEXCEPT(std::span<T>(from));
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assert(span.data() == nullptr);
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assert(span.size() == 0);
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}
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{
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From array[3] = {};
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std::span<From> from(array);
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std::span<T> span{from};
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ASSERT_NOEXCEPT(std::span<T>(from));
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assert(span.data() == array);
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assert(span.size() == 3);
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}
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}
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// static -> static
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{
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{
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std::span<From, 0> from;
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std::span<T, 0> span{from};
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ASSERT_NOEXCEPT(std::span<T, 0>(from));
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assert(span.data() == nullptr);
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assert(span.size() == 0);
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}
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{
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From array[3] = {};
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std::span<From, 3> from(array);
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std::span<T, 3> span{from};
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ASSERT_NOEXCEPT(std::span<T, 3>(from));
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assert(span.data() == array);
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assert(span.size() == 3);
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}
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}
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// static -> dynamic
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{
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{
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std::span<From, 0> from;
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std::span<T> span{from};
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ASSERT_NOEXCEPT(std::span<T>(from));
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assert(span.data() == nullptr);
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assert(span.size() == 0);
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}
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{
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From array[3] = {};
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std::span<From, 3> from(array);
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std::span<T> span{from};
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ASSERT_NOEXCEPT(std::span<T>(from));
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assert(span.data() == array);
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assert(span.size() == 3);
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}
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}
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// dynamic -> static (not allowed)
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}
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template <class T>
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TEST_CONSTEXPR_CXX20 void check_cvs() {
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check<T, T>();
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check<T const, T>();
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check<T const, T const>();
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check<T volatile, T>();
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check<T volatile, T volatile>();
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check<T const volatile, T>();
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check<T const volatile, T const>();
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check<T const volatile, T volatile>();
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check<T const volatile, T const volatile>();
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}
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struct A {};
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TEST_CONSTEXPR_CXX20 bool test() {
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check_cvs<int>();
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check_cvs<long>();
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check_cvs<double>();
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check_cvs<std::string>();
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check_cvs<A>();
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return true;
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}
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int main(int, char**) {
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static_assert(test());
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test();
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return 0;
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}
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