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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
// constexpr const iterator_t<Base>& inner-iterator::base() const& noexcept;
//
// constexpr iterator_t<Base> inner-iterator::base() &&
// requires forward_range<View>;
#include <ranges>
#include <concepts>
#include <utility>
#include "../types.h"
static_assert( noexcept(std::declval<InnerIterForward&>().base()));
static_assert( noexcept(std::declval<InnerIterForward const &>().base()));
static_assert( noexcept(std::declval<InnerIterForward const &&>().base()));
static_assert( noexcept(std::declval<InnerIterInput&>().base()));
static_assert( noexcept(std::declval<InnerIterInput const &>().base()));
static_assert( noexcept(std::declval<InnerIterInput const &&>().base()));
constexpr bool test() {
// `base` works with a forward view (two different overloads based on ref-qualification of the `inner-iterator`).
{
using BaseIter = std::ranges::iterator_t<CopyableView>;
CopyableView input("abc def");
std::ranges::lazy_split_view<CopyableView, ForwardView> v(input, " ");
auto i = (*v.begin()).begin();
const auto ci = i;
// Note: some macOS platforms seem to have trouble deducing the type when using `std::same_as` -- use the equivalent
// `ASSERT_SAME_TYPE` instead.
{
decltype(auto) b = i.base();
ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
assert(b == input.begin());
}
{
decltype(auto) b = ci.base();
ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
assert(b == input.begin());
}
{
decltype(auto) b = std::move(i).base();
ASSERT_SAME_TYPE(decltype(b), BaseIter);
assert(b == input.begin());
}
{
decltype(auto) b = std::move(ci).base();
ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
assert(b == input.begin());
}
}
// `base` works with an input view (no overloads).
{
using BaseIter = std::ranges::iterator_t<InputView>;
InputView input("abc def");
std::ranges::lazy_split_view<InputView, ForwardTinyView> v(input, ' ');
auto i = (*v.begin()).begin();
const auto ci = i;
{
decltype(auto) b = i.base();
ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
}
{
decltype(auto) b = ci.base();
ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
}
{
decltype(auto) b = std::move(i).base();
ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
}
{
decltype(auto) b = std::move(ci).base();
ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
}
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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