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//===---------------------------------------------------------------------===//
//
// 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 It, class End>
// constexpr explicit(Extent != dynamic_extent) span(It first, End 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.
// Throws: When and what last - first throws.
#include <array>
#include <span>
#include <cassert>
#include <utility>
#include "assert_macros.h"
#include "test_iterators.h"
#include "test_macros.h"
template <class T, class Sentinel>
constexpr bool test_ctor() {
T val[2] = {};
auto s1 = std::span<T>(std::begin(val), Sentinel(std::end(val)));
auto s2 = std::span<T, 2>(std::begin(val), Sentinel(std::end(val)));
assert(s1.data() == std::data(val) && s1.size() == std::size(val));
assert(s2.data() == std::data(val) && s2.size() == std::size(val));
return true;
}
template <std::size_t Extent>
constexpr void test_constructibility() {
static_assert(std::is_constructible_v<std::span<int, Extent>, int*, int*>);
static_assert(!std::is_constructible_v<std::span<int, Extent>, const int*, const int*>);
static_assert(!std::is_constructible_v<std::span<int, Extent>, volatile int*, volatile int*>);
static_assert(std::is_constructible_v<std::span<const int, Extent>, int*, int*>);
static_assert(std::is_constructible_v<std::span<const int, Extent>, const int*, const int*>);
static_assert(!std::is_constructible_v<std::span<const int, Extent>, volatile int*, volatile int*>);
static_assert(std::is_constructible_v<std::span<volatile int, Extent>, int*, int*>);
static_assert(!std::is_constructible_v<std::span<volatile int, Extent>, const int*, const int*>);
static_assert(std::is_constructible_v<std::span<volatile int, Extent>, volatile int*, volatile int*>);
static_assert(!std::is_constructible_v<std::span<int, Extent>, int*, float*>); // types wrong
}
constexpr bool test() {
test_constructibility<std::dynamic_extent>();
test_constructibility<3>();
struct A {};
assert((test_ctor<int, int*>()));
assert((test_ctor<int, sized_sentinel<int*>>()));
assert((test_ctor<A, A*>()));
assert((test_ctor<A, sized_sentinel<A*>>()));
return true;
}
#ifndef TEST_HAS_NO_EXCEPTIONS
// A stripped down contiguous iterator that throws when using operator-.
template <class It>
class throw_operator_minus {
It it_;
public:
typedef std::contiguous_iterator_tag iterator_category;
typedef typename std::iterator_traits<It>::value_type value_type;
typedef typename std::iterator_traits<It>::difference_type difference_type;
typedef It pointer;
typedef typename std::iterator_traits<It>::reference reference;
typedef std::remove_reference_t<reference> element_type;
throw_operator_minus() : it_() {}
explicit throw_operator_minus(It it) : it_(it) {}
reference operator*() const { return *it_; }
pointer operator->() const { return it_; }
reference operator[](difference_type n) const { return it_[n]; }
throw_operator_minus& operator++() {
++it_;
return *this;
}
throw_operator_minus& operator--() {
--it_;
return *this;
}
throw_operator_minus operator++(int) { return throw_operator_minus(it_++); }
throw_operator_minus operator--(int) { return throw_operator_minus(it_--); }
throw_operator_minus& operator+=(difference_type n) {
it_ += n;
return *this;
}
throw_operator_minus& operator-=(difference_type n) {
it_ -= n;
return *this;
}
friend throw_operator_minus operator+(throw_operator_minus x, difference_type n) {
x += n;
return x;
}
friend throw_operator_minus operator+(difference_type n, throw_operator_minus x) {
x += n;
return x;
}
friend throw_operator_minus operator-(throw_operator_minus x, difference_type n) {
x -= n;
return x;
}
friend difference_type operator-(throw_operator_minus, throw_operator_minus) { throw 42; };
friend bool operator==(const throw_operator_minus& x, const throw_operator_minus& y) { return x.it_ == y.it_; }
friend bool operator<(const throw_operator_minus& x, const throw_operator_minus& y) { return x.it_ < y.it_; }
friend bool operator>(const throw_operator_minus& x, const throw_operator_minus& y) { return x.it_ > y.it_; }
friend bool operator<=(const throw_operator_minus& x, const throw_operator_minus& y) { return x.it_ <= y.it_; }
friend bool operator>=(const throw_operator_minus& x, const throw_operator_minus& y) { return x.it_ >= y.it_; }
};
template <class It>
throw_operator_minus(It) -> throw_operator_minus<It>;
void test_exceptions() {
std::array a{42};
TEST_VALIDATE_EXCEPTION(
int,
[](int i) { assert(i == 42); },
(std::span<int>{throw_operator_minus{a.begin()}, throw_operator_minus{a.end()}}));
TEST_VALIDATE_EXCEPTION(
int,
[](int i) { assert(i == 42); },
(std::span<int, 1>{throw_operator_minus{a.begin()}, throw_operator_minus{a.end()}}));
}
#endif // TEST_HAS_NO_EXCEPTIONS
int main(int, char**) {
test();
#ifndef TEST_HAS_NO_EXCEPTIONS
test_exceptions();
#endif
static_assert(test());
return 0;
}
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