| // -*- C++ -*- |
| //===------------------------------ span ---------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===---------------------------------------------------------------------===// |
| // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 |
| |
| // <span> |
| |
| // constexpr span(pointer first, pointer last); |
| // Requires: [first, last) shall be a valid range. |
| // If extent is not equal to dynamic_extent, then last - first shall be equal to extent. |
| // |
| |
| #include <span> |
| #include <cassert> |
| #include <string> |
| |
| #include "test_macros.h" |
| |
| void checkCV() |
| { |
| int arr[] = {1,2,3}; |
| const int carr[] = {4,5,6}; |
| volatile int varr[] = {7,8,9}; |
| const volatile int cvarr[] = {1,3,5}; |
| |
| // Types the same (dynamic sized) |
| { |
| std::span< int> s1{ arr, arr + 3}; // a span< int> pointing at int. |
| std::span<const int> s2{ carr, carr + 3}; // a span<const int> pointing at const int. |
| std::span< volatile int> s3{ varr, varr + 3}; // a span< volatile int> pointing at volatile int. |
| std::span<const volatile int> s4{cvarr, cvarr + 3}; // a span<const volatile int> pointing at const volatile int. |
| assert(s1.size() + s2.size() + s3.size() + s4.size() == 12); |
| } |
| |
| // Types the same (static sized) |
| { |
| std::span< int,3> s1{ arr, arr + 3}; // a span< int> pointing at int. |
| std::span<const int,3> s2{ carr, carr + 3}; // a span<const int> pointing at const int. |
| std::span< volatile int,3> s3{ varr, varr + 3}; // a span< volatile int> pointing at volatile int. |
| std::span<const volatile int,3> s4{cvarr, cvarr + 3}; // a span<const volatile int> pointing at const volatile int. |
| assert(s1.size() + s2.size() + s3.size() + s4.size() == 12); |
| } |
| |
| |
| // types different (dynamic sized) |
| { |
| std::span<const int> s1{ arr, arr + 3}; // a span<const int> pointing at int. |
| std::span< volatile int> s2{ arr, arr + 3}; // a span< volatile int> pointing at int. |
| std::span< volatile int> s3{ arr, arr + 3}; // a span< volatile int> pointing at const int. |
| std::span<const volatile int> s4{ arr, arr + 3}; // a span<const volatile int> pointing at int. |
| std::span<const volatile int> s5{carr, carr + 3}; // a span<const volatile int> pointing at const int. |
| std::span<const volatile int> s6{varr, varr + 3}; // a span<const volatile int> pointing at volatile int. |
| assert(s1.size() + s2.size() + s3.size() + s4.size() + s5.size() + s6.size() == 18); |
| } |
| |
| // types different (static sized) |
| { |
| std::span<const int,3> s1{ arr, arr + 3}; // a span<const int> pointing at int. |
| std::span< volatile int,3> s2{ arr, arr + 3}; // a span< volatile int> pointing at int. |
| std::span< volatile int,3> s3{ arr, arr + 3}; // a span< volatile int> pointing at const int. |
| std::span<const volatile int,3> s4{ arr, arr + 3}; // a span<const volatile int> pointing at int. |
| std::span<const volatile int,3> s5{carr, carr + 3}; // a span<const volatile int> pointing at const int. |
| std::span<const volatile int,3> s6{varr, varr + 3}; // a span<const volatile int> pointing at volatile int. |
| assert(s1.size() + s2.size() + s3.size() + s4.size() + s5.size() + s6.size() == 18); |
| } |
| } |
| |
| |
| template <typename T> |
| constexpr bool testConstexprSpan() |
| { |
| constexpr T val[2] = {}; |
| std::span<const T> s1{val, val+2}; |
| std::span<const T,2> s2{val, val+2}; |
| return |
| s1.data() == &val[0] && s1.size() == 2 |
| && s2.data() == &val[0] && s2.size() == 2; |
| } |
| |
| |
| template <typename T> |
| void testRuntimeSpan() |
| { |
| T val[2] = {}; |
| std::span<T> s1{val, val+2}; |
| std::span<T,2> s2{val, val+2}; |
| assert(s1.data() == &val[0] && s1.size() == 2); |
| assert(s2.data() == &val[0] && s2.size() == 2); |
| } |
| |
| struct A{}; |
| |
| int main(int, char**) |
| { |
| static_assert(testConstexprSpan<int>(), ""); |
| static_assert(testConstexprSpan<long>(), ""); |
| static_assert(testConstexprSpan<double>(), ""); |
| static_assert(testConstexprSpan<A>(), ""); |
| |
| testRuntimeSpan<int>(); |
| testRuntimeSpan<long>(); |
| testRuntimeSpan<double>(); |
| testRuntimeSpan<std::string>(); |
| testRuntimeSpan<A>(); |
| |
| checkCV(); |
| |
| return 0; |
| } |