forked from OSchip/llvm-project
115 lines
4.5 KiB
C++
115 lines
4.5 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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// constexpr span(pointer first, pointer last);
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// Requires: [first, last) shall be a valid range.
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// If extent is not equal to dynamic_extent, then last - first shall be equal to extent.
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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, arr + 3}; // a span< int> pointing at int.
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std::span<const int> s2{ carr, carr + 3}; // a span<const int> pointing at const int.
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std::span< volatile int> s3{ varr, varr + 3}; // a span< volatile int> pointing at volatile int.
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std::span<const volatile int> s4{cvarr, cvarr + 3}; // 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, arr + 3}; // a span< int> pointing at int.
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std::span<const int,3> s2{ carr, carr + 3}; // a span<const int> pointing at const int.
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std::span< volatile int,3> s3{ varr, varr + 3}; // a span< volatile int> pointing at volatile int.
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std::span<const volatile int,3> s4{cvarr, cvarr + 3}; // 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, arr + 3}; // a span<const int> pointing at int.
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std::span< volatile int> s2{ arr, arr + 3}; // a span< volatile int> pointing at int.
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std::span< volatile int> s3{ arr, arr + 3}; // a span< volatile int> pointing at const int.
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std::span<const volatile int> s4{ arr, arr + 3}; // a span<const volatile int> pointing at int.
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std::span<const volatile int> s5{carr, carr + 3}; // a span<const volatile int> pointing at const int.
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std::span<const volatile int> s6{varr, varr + 3}; // 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, arr + 3}; // a span<const int> pointing at int.
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std::span< volatile int,3> s2{ arr, arr + 3}; // a span< volatile int> pointing at int.
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std::span< volatile int,3> s3{ arr, arr + 3}; // a span< volatile int> pointing at const int.
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std::span<const volatile int,3> s4{ arr, arr + 3}; // a span<const volatile int> pointing at int.
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std::span<const volatile int,3> s5{carr, carr + 3}; // a span<const volatile int> pointing at const int.
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std::span<const volatile int,3> s6{varr, varr + 3}; // 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 <typename T>
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constexpr bool testConstexprSpan()
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{
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constexpr T val[2] = {};
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std::span<const T> s1{val, val+2};
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std::span<const T,2> s2{val, val+2};
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return
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s1.data() == &val[0] && s1.size() == 2
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&& s2.data() == &val[0] && s2.size() == 2;
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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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T val[2] = {};
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std::span<T> s1{val, val+2};
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std::span<T,2> s2{val, val+2};
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assert(s1.data() == &val[0] && s1.size() == 2);
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assert(s2.data() == &val[0] && s2.size() == 2);
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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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checkCV();
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return 0;
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}
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