122 lines
4.4 KiB
C++
122 lines
4.4 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(element_type (&arr)[N]) 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 <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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int arr[] = {1,2,3};
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const int carr[] = {4,5,6};
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volatile int varr[] = {7,8,9};
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const volatile int 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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std::span<const int> s2{ carr}; // a span<const int> pointing at const int.
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std::span< volatile int> s3{ varr}; // a span< volatile int> pointing at volatile int.
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std::span<const volatile int> s4{cvarr}; // a span<const volatile int> pointing at const volatile int.
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assert(s1.size() + s2.size() + s3.size() + s4.size() == 12);
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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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std::span<const int,3> s2{ carr}; // a span<const int> pointing at const int.
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std::span< volatile int,3> s3{ varr}; // a span< volatile int> pointing at volatile int.
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std::span<const volatile int,3> s4{cvarr}; // a span<const volatile int> pointing at const volatile int.
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assert(s1.size() + s2.size() + s3.size() + s4.size() == 12);
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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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std::span<const volatile int> s5{carr}; // a span<const volatile int> pointing at const int.
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std::span<const volatile int> s6{varr}; // a span<const volatile int> pointing at volatile int.
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assert(s1.size() + s2.size() + s3.size() + s4.size() + s5.size() + s6.size() == 18);
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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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std::span<const volatile int,3> s5{carr}; // a span<const volatile int> pointing at const int.
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std::span<const volatile int,3> s6{varr}; // a span<const volatile int> pointing at volatile int.
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assert(s1.size() + s2.size() + s3.size() + s4.size() + s5.size() + s6.size() == 18);
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}
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}
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template<class T>
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constexpr bool testSpan()
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{
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T val[2] = {};
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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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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<T> s1 = val;
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std::span<T, 2> s2 = val;
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std::span<const T> s3 = val;
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std::span<const T, 2> s4 = val;
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assert(s1.data() == val && s1.size() == 2);
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assert(s2.data() == val && s2.size() == 2);
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assert(s3.data() == val && s3.size() == 2);
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assert(s4.data() == val && s4.size() == 2);
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std::span<const int> s5 = {{1,2}};
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std::span<const int, 2> s6 = {{1,2}};
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assert(s5.size() == 2); // and it dangles
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assert(s6.size() == 2); // and it dangles
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return true;
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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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testSpan<int>();
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testSpan<double>();
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testSpan<A>();
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testSpan<std::string>();
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static_assert(testSpan<int>());
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static_assert(testSpan<double>());
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static_assert(testSpan<A>());
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checkCV();
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return 0;
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}
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