144 lines
5.0 KiB
C++
144 lines
5.0 KiB
C++
// -*- C++ -*-
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//===------------------------------ span ---------------------------------===//
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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++98, c++03, c++11, c++14, c++17
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// <span>
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// template<class OtherElementType, ptrdiff_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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void checkCV()
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{
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std::span< int> sp;
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// std::span<const int> csp;
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std::span< volatile int> vsp;
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// std::span<const volatile int> cvsp;
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std::span< int, 0> sp0;
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// std::span<const int, 0> csp0;
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std::span< volatile int, 0> vsp0;
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// std::span<const volatile int, 0> cvsp0;
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// dynamic -> dynamic
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{
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std::span<const int> s1{ sp}; // a span<const int> pointing at int.
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std::span< volatile int> s2{ sp}; // a span< volatile int> pointing at int.
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std::span<const volatile int> s3{ sp}; // a span<const volatile int> pointing at int.
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std::span<const volatile int> s4{ vsp}; // a span<const volatile int> pointing at volatile int.
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assert(s1.size() + s2.size() + s3.size() + s4.size() == 0);
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}
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// static -> static
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{
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std::span<const int, 0> s1{ sp0}; // a span<const int> pointing at int.
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std::span< volatile int, 0> s2{ sp0}; // a span< volatile int> pointing at int.
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std::span<const volatile int, 0> s3{ sp0}; // a span<const volatile int> pointing at int.
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std::span<const volatile int, 0> s4{ vsp0}; // a span<const volatile int> pointing at volatile int.
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assert(s1.size() + s2.size() + s3.size() + s4.size() == 0);
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}
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// static -> dynamic
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{
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std::span<const int> s1{ sp0}; // a span<const int> pointing at int.
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std::span< volatile int> s2{ sp0}; // a span< volatile int> pointing at int.
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std::span<const volatile int> s3{ sp0}; // a span<const volatile int> pointing at int.
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std::span<const volatile int> s4{ vsp0}; // a span<const volatile int> pointing at volatile int.
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assert(s1.size() + s2.size() + s3.size() + s4.size() == 0);
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}
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// dynamic -> static
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{
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std::span<const int, 0> s1{ sp}; // a span<const int> pointing at int.
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std::span< volatile int, 0> s2{ sp}; // a span< volatile int> pointing at int.
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std::span<const volatile int, 0> s3{ sp}; // a span<const volatile int> pointing at int.
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std::span<const volatile int, 0> s4{ vsp}; // a span<const volatile int> pointing at volatile int.
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assert(s1.size() + s2.size() + s3.size() + s4.size() == 0);
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}
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}
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template <typename T>
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constexpr bool testConstexprSpan()
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{
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std::span<T> s0{};
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std::span<T, 0> s1(s0); // dynamic -> static
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std::span<T> s2(s1); // static -> dynamic
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ASSERT_NOEXCEPT(std::span<T> {s0});
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ASSERT_NOEXCEPT(std::span<T, 0>{s1});
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ASSERT_NOEXCEPT(std::span<T> {s1});
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ASSERT_NOEXCEPT(std::span<T, 0>{s0});
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return
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s1.data() == nullptr && s1.size() == 0
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&& s2.data() == nullptr && s2.size() == 0;
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}
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template <typename T>
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void testRuntimeSpan()
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{
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std::span<T> s0{};
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std::span<T, 0> s1(s0); // dynamic -> static
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std::span<T> s2(s1); // static -> dynamic
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ASSERT_NOEXCEPT(std::span<T> {s0});
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ASSERT_NOEXCEPT(std::span<T, 0>{s1});
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ASSERT_NOEXCEPT(std::span<T> {s1});
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ASSERT_NOEXCEPT(std::span<T, 0>{s0});
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assert(s1.data() == nullptr && s1.size() == 0);
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assert(s2.data() == nullptr && s2.size() == 0);
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}
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template <typename Dest, typename Src>
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bool testConversionSpan()
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{
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static_assert(std::is_convertible_v<Src(*)[], Dest(*)[]>, "Bad input types to 'testConversionSpan");
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std::span<Src> s0d{};
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std::span<Src> s0s{};
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std::span<Dest, 0> s1(s0d); // dynamic -> static
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std::span<Dest> s2(s0s); // static -> dynamic
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s1.data() == nullptr && s1.size() == 0
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&& s2.data() == nullptr && s2.size() == 0;
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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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static_assert(testConstexprSpan<int>(), "");
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static_assert(testConstexprSpan<long>(), "");
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static_assert(testConstexprSpan<double>(), "");
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static_assert(testConstexprSpan<A>(), "");
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testRuntimeSpan<int>();
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testRuntimeSpan<long>();
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testRuntimeSpan<double>();
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testRuntimeSpan<std::string>();
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testRuntimeSpan<A>();
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// TODO: Add some conversion tests here that aren't "X --> const X"
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// assert((testConversionSpan<unsigned char, char>()));
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checkCV();
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return 0;
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}
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