//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef TEST_STD_ITERATORS_ITERATOR_PRIMITIVES_RANGE_ITER_OPS_TYPES_H
#define TEST_STD_ITERATORS_ITERATOR_PRIMITIVES_RANGE_ITER_OPS_TYPES_H
#include <cassert>
#include <cstddef>
#include <iterator>
#include <utility>
#include "test_iterators.h" // for the fallthrough base() function
class distance_apriori_sentinel {
public:
distance_apriori_sentinel() = default;
constexpr explicit distance_apriori_sentinel(std::ptrdiff_t const count) : count_(count) {}
constexpr bool operator==(std::input_or_output_iterator auto const&) const {
assert(false && "difference op should take precedence");
return false;
}
friend constexpr std::ptrdiff_t operator-(std::input_or_output_iterator auto const&,
distance_apriori_sentinel const y) {
return -y.count_;
}
friend constexpr std::ptrdiff_t operator-(distance_apriori_sentinel const x,
std::input_or_output_iterator auto const&) {
return x.count_;
}
private:
std::ptrdiff_t count_ = 0;
};
// Sentinel type that can be assigned to an iterator. This is to test the cases where the
// various iterator operations use assignment instead of successive increments/decrements.
template <class It>
class assignable_sentinel {
public:
explicit assignable_sentinel() = default;
constexpr explicit assignable_sentinel(const It& it) : base_(base(it)) {}
constexpr operator It() const { return It(base_); }
constexpr bool operator==(const It& other) const { return base_ == base(other); }
friend constexpr It base(const assignable_sentinel& s) { return It(s.base_); }
private:
decltype(base(std::declval<It>())) base_;
};
template <class It>
assignable_sentinel(const It&) -> assignable_sentinel<It>;
#endif // TEST_STD_ITERATORS_ITERATOR_PRIMITIVES_RANGE_ITER_OPS_TYPES_H