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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>
// template<class OtherElementType, size_t OtherExtent>
// constexpr span(const span<OtherElementType, OtherExtent>& s) noexcept;
//
// Remarks: This constructor shall not participate in overload resolution unless:
// Extent == dynamic_extent || Extent == OtherExtent is true, and
// OtherElementType(*)[] is convertible to ElementType(*)[].
#include <span>
#include <cassert>
#include <string>
#include "test_macros.h"
template<class T, size_t extent, size_t otherExtent>
std::span<T, extent> createImplicitSpan(std::span<T, otherExtent> s) {
return {s}; // expected-error {{chosen constructor is explicit in copy-initialization}}
}
void checkCV ()
{
// std::span< int> sp;
std::span<const int> csp;
std::span< volatile int> vsp;
std::span<const volatile int> cvsp;
// std::span< int, 0> sp0;
std::span<const int, 0> csp0;
std::span< volatile int, 0> vsp0;
std::span<const volatile int, 0> cvsp0;
// Try to remove const and/or volatile (dynamic -> dynamic)
{
std::span< int> s1{ csp}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
std::span< int> s2{ vsp}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
std::span< int> s3{cvsp}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
std::span<const int> s4{ vsp}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
std::span<const int> s5{cvsp}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
std::span< volatile int> s6{ csp}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
std::span< volatile int> s7{cvsp}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
}
// Try to remove const and/or volatile (static -> static)
{
std::span< int, 0> s1{ csp0}; // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
std::span< int, 0> s2{ vsp0}; // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
std::span< int, 0> s3{cvsp0}; // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
std::span<const int, 0> s4{ vsp0}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 0>'}}
std::span<const int, 0> s5{cvsp0}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 0>'}}
std::span< volatile int, 0> s6{ csp0}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 0>'}}
std::span< volatile int, 0> s7{cvsp0}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 0>'}}
}
// Try to remove const and/or volatile (static -> dynamic)
{
std::span< int> s1{ csp0}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
std::span< int> s2{ vsp0}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
std::span< int> s3{cvsp0}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
std::span<const int> s4{ vsp0}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
std::span<const int> s5{cvsp0}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
std::span< volatile int> s6{ csp0}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
std::span< volatile int> s7{cvsp0}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
}
// Try to remove const and/or volatile (static -> static)
{
std::span< int, 0> s1{ csp}; // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
std::span< int, 0> s2{ vsp}; // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
std::span< int, 0> s3{cvsp}; // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
std::span<const int, 0> s4{ vsp}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 0>'}}
std::span<const int, 0> s5{cvsp}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 0>'}}
std::span< volatile int, 0> s6{ csp}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 0>'}}
std::span< volatile int, 0> s7{cvsp}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 0>'}}
}
}
int main(int, char**)
{
std::span<int> sp;
std::span<int, 0> sp0;
std::span<float> s1{sp}; // expected-error {{no matching constructor for initialization of 'std::span<float>'}}
std::span<float> s2{sp0}; // expected-error {{no matching constructor for initialization of 'std::span<float>'}}
std::span<float, 0> s3{sp}; // expected-error {{no matching constructor for initialization of 'std::span<float, 0>'}}
std::span<float, 0> s4{sp0}; // expected-error {{no matching constructor for initialization of 'std::span<float, 0>'}}
checkCV();
// explicit constructor necessary
{
createImplicitSpan<int, 1>(sp);
}
return 0;
}
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