forked from OSchip/llvm-project
118 lines
4.6 KiB
C++
118 lines
4.6 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 Container>
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// constexpr span(Container& cont);
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// template<class Container>
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// constexpr span(const Container& cont);
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//
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// Remarks: These constructors shall not participate in overload resolution unless:
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// — extent == dynamic_extent,
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// — Container is not a specialization of span,
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// — Container is not a specialization of array,
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// — is_array_v<Container> is false,
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// — data(cont) and size(cont) are both well-formed, and
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// — remove_pointer_t<decltype(data(cont))>(*)[] is convertible to ElementType(*)[].
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//
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#include <span>
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#include <cassert>
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#include <deque>
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#include <forward_list>
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#include <list>
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#include <vector>
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#include "test_macros.h"
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// Look ma - I'm a container!
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template <typename T>
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struct IsAContainer {
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constexpr IsAContainer() : v_{} {}
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constexpr size_t size() const {return 1;}
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constexpr T *data() {return &v_;}
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constexpr const T *data() const {return &v_;}
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constexpr const T *getV() const {return &v_;} // for checking
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T v_;
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};
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template <typename T>
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struct NotAContainerNoData {
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size_t size() const {return 0;}
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};
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template <typename T>
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struct NotAContainerNoSize {
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const T *data() const {return nullptr;}
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};
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template <typename T>
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struct NotAContainerPrivate {
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private:
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size_t size() const {return 0;}
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const T *data() const {return nullptr;}
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};
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int main(int, char**)
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{
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// Making non-const spans from const sources (a temporary binds to `const &`)
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{
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std::span<int> s1{IsAContainer<int>()}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
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std::span<int> s3{std::vector<int>()}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
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}
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// Missing size and/or data
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{
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std::span<const int> s1{NotAContainerNoData<int>()}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
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std::span<const int> s3{NotAContainerNoSize<int>()}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
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std::span<const int> s5{NotAContainerPrivate<int>()}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
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// Again with the standard containers
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std::span<const int> s11{std::deque<int>()}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
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std::span<const int> s13{std::list<int>()}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
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std::span<const int> s15{std::forward_list<int>()}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
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}
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// Not the same type
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{
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IsAContainer<int> c;
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std::span<float> s1{c}; // expected-error {{no matching constructor for initialization of 'std::span<float>'}}
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}
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// CV wrong
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{
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IsAContainer<const int> c;
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IsAContainer<const volatile int> cv;
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IsAContainer< volatile int> v;
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std::span< int> s1{c}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
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std::span< int> s2{v}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
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std::span< int> s3{cv}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
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std::span<const int> s4{v}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
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std::span<const int> s5{cv}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
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std::span< volatile int> s6{c}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
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std::span< volatile int> s7{cv}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
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}
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// statically sized
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{
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IsAContainer<int> c;
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std::span<int,1> s1{c}; // expected-error {{no matching constructor for initialization of 'std::span<int, 1>'}}
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}
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return 0;
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}
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