forked from OSchip/llvm-project
121 lines
4.0 KiB
C++
121 lines
4.0 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<size_t N>
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// constexpr span(array<value_type, N>& arr) noexcept;
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// template<size_t N>
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// constexpr span(const array<value_type, N>& arr) noexcept;
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//
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// Remarks: These constructors shall not participate in overload resolution unless:
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// - extent == dynamic_extent || N == extent is true, and
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// - remove_pointer_t<decltype(data(arr))>(*)[] is convertible to ElementType(*)[].
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//
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#include <span>
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#include <array>
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#include <cassert>
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#include <string>
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#include "test_macros.h"
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void checkCV()
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{
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std::array<int, 3> arr = {1,2,3};
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// STL says these are not cromulent
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// std::array<const int,3> carr = {4,5,6};
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// std::array<volatile int, 3> varr = {7,8,9};
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// std::array<const volatile int, 3> cvarr = {1,3,5};
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// Types the same (dynamic sized)
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{
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std::span< int> s1{ arr}; // a span< int> pointing at int.
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}
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// Types the same (static sized)
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{
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std::span< int,3> s1{ arr}; // a span< int> pointing at int.
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}
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// types different (dynamic sized)
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{
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std::span<const int> s1{ arr}; // a span<const int> pointing at int.
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std::span< volatile int> s2{ arr}; // a span< volatile int> pointing at int.
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std::span< volatile int> s3{ arr}; // a span< volatile int> pointing at const int.
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std::span<const volatile int> s4{ arr}; // a span<const volatile int> pointing at int.
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}
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// types different (static sized)
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{
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std::span<const int,3> s1{ arr}; // a span<const int> pointing at int.
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std::span< volatile int,3> s2{ arr}; // a span< volatile int> pointing at int.
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std::span< volatile int,3> s3{ arr}; // a span< volatile int> pointing at const int.
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std::span<const volatile int,3> s4{ arr}; // a span<const volatile int> pointing at int.
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}
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}
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template <typename T, typename U>
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constexpr bool testConstructorArray() {
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std::array<U, 2> val = {U(), U()};
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ASSERT_NOEXCEPT(std::span<T>{val});
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ASSERT_NOEXCEPT(std::span<T, 2>{val});
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std::span<T> s1{val};
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std::span<T, 2> s2{val};
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return s1.data() == &val[0] && s1.size() == 2 && s2.data() == &val[0] &&
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s2.size() == 2;
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}
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template <typename T, typename U>
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constexpr bool testConstructorConstArray() {
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const std::array<U, 2> val = {U(), U()};
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ASSERT_NOEXCEPT(std::span<const T>{val});
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ASSERT_NOEXCEPT(std::span<const T, 2>{val});
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std::span<const T> s1{val};
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std::span<const T, 2> s2{val};
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return s1.data() == &val[0] && s1.size() == 2 && s2.data() == &val[0] &&
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s2.size() == 2;
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}
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template <typename T>
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constexpr bool testConstructors() {
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static_assert(testConstructorArray<T, T>(), "");
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static_assert(testConstructorArray<const T, const T>(), "");
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static_assert(testConstructorArray<const T, T>(), "");
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static_assert(testConstructorConstArray<T, T>(), "");
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static_assert(testConstructorConstArray<const T, const T>(), "");
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static_assert(testConstructorConstArray<const T, T>(), "");
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return testConstructorArray<T, T>() &&
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testConstructorArray<const T, const T>() &&
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testConstructorArray<const T, T>() &&
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testConstructorConstArray<T, T>() &&
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testConstructorConstArray<const T, const T>() &&
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testConstructorConstArray<const T, T>();
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}
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struct A{};
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int main(int, char**)
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{
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assert(testConstructors<int>());
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assert(testConstructors<long>());
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assert(testConstructors<double>());
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assert(testConstructors<A>());
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assert(testConstructors<int*>());
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assert(testConstructors<const int*>());
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checkCV();
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return 0;
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}
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