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// -*- 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++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"
int arr[] = {1,2,3};
const int carr[] = {4,5,6};
volatile int varr[] = {7,8,9};
const volatile int cvarr[] = {1,3,5};
template<class T, size_t extent>
std::span<T, extent> createImplicitSpan(T* first, T* last) {
return {first, last}; // expected-error {{chosen constructor is explicit in copy-initialization}}
}
int main(int, char**)
{
// We can't check that the size doesn't match - because that's a runtime property
// std::span<int, 2> s1(arr, arr + 3);
// Type wrong
{
std::span<float> s1(arr, arr + 3); // expected-error {{no matching constructor for initialization of 'std::span<float>'}}
std::span<float, 3> s2(arr, arr + 3); // expected-error {{no matching constructor for initialization of 'std::span<float, 3>'}}
}
// CV wrong (dynamically sized)
{
std::span< int> s1{ carr, carr + 3}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
std::span< int> s2{ varr, varr + 3}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
std::span< int> s3{cvarr, cvarr + 3}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
std::span<const int> s4{ varr, varr + 3}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
std::span<const int> s5{cvarr, cvarr + 3}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
std::span< volatile int> s6{ carr, carr + 3}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
std::span< volatile int> s7{cvarr, cvarr + 3}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
}
// CV wrong (statically sized)
{
std::span< int,3> s1{ carr, carr + 3}; // expected-error {{no matching constructor for initialization of 'std::span<int, 3>'}}
std::span< int,3> s2{ varr, varr + 3}; // expected-error {{no matching constructor for initialization of 'std::span<int, 3>'}}
std::span< int,3> s3{cvarr, cvarr + 3}; // expected-error {{no matching constructor for initialization of 'std::span<int, 3>'}}
std::span<const int,3> s4{ varr, varr + 3}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 3>'}}
std::span<const int,3> s5{cvarr, cvarr + 3}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 3>'}}
std::span< volatile int,3> s6{ carr, carr + 3}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 3>'}}
std::span< volatile int,3> s7{cvarr, cvarr + 3}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 3>'}}
}
// explicit constructor necessary
{
createImplicitSpan<int, 1>(arr, arr + 1);
}
return 0;
}
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