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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
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ALGORITHM_RANGES_TRANSFORM_H
#define _LIBCPP___ALGORITHM_RANGES_TRANSFORM_H
#include <__algorithm/in_in_out_result.h>
#include <__algorithm/in_out_result.h>
#include <__concepts/constructible.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/invoke.h>
#include <__iterator/concepts.h>
#include <__iterator/projected.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
#include <__ranges/dangling.h>
#include <__utility/move.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#if _LIBCPP_STD_VER >= 20
_LIBCPP_BEGIN_NAMESPACE_STD
namespace ranges {
template <class _Ip, class _Op>
using unary_transform_result = in_out_result<_Ip, _Op>;
template <class _I1, class _I2, class _O1>
using binary_transform_result = in_in_out_result<_I1, _I2, _O1>;
namespace __transform {
struct __fn {
private:
template <class _InIter, class _Sent, class _OutIter, class _Func, class _Proj>
_LIBCPP_HIDE_FROM_ABI static constexpr unary_transform_result<_InIter, _OutIter>
__unary(_InIter __first, _Sent __last, _OutIter __result, _Func& __operation, _Proj& __projection) {
while (__first != __last) {
*__result = std::invoke(__operation, std::invoke(__projection, *__first));
++__first;
++__result;
}
return {std::move(__first), std::move(__result)};
}
template <class _InIter1,
class _Sent1,
class _InIter2,
class _Sent2,
class _OutIter,
class _Func,
class _Proj1,
class _Proj2>
_LIBCPP_HIDE_FROM_ABI static constexpr binary_transform_result<_InIter1, _InIter2, _OutIter>
__binary(_InIter1 __first1,
_Sent1 __last1,
_InIter2 __first2,
_Sent2 __last2,
_OutIter __result,
_Func& __binary_operation,
_Proj1& __projection1,
_Proj2& __projection2) {
while (__first1 != __last1 && __first2 != __last2) {
*__result =
std::invoke(__binary_operation, std::invoke(__projection1, *__first1), std::invoke(__projection2, *__first2));
++__first1;
++__first2;
++__result;
}
return {std::move(__first1), std::move(__first2), std::move(__result)};
}
public:
template <input_iterator _InIter,
sentinel_for<_InIter> _Sent,
weakly_incrementable _OutIter,
copy_constructible _Func,
class _Proj = identity>
requires indirectly_writable<_OutIter, indirect_result_t<_Func&, projected<_InIter, _Proj>>>
_LIBCPP_HIDE_FROM_ABI constexpr unary_transform_result<_InIter, _OutIter>
operator()(_InIter __first, _Sent __last, _OutIter __result, _Func __operation, _Proj __proj = {}) const {
return __unary(std::move(__first), std::move(__last), std::move(__result), __operation, __proj);
}
template <input_range _Range, weakly_incrementable _OutIter, copy_constructible _Func, class _Proj = identity>
requires indirectly_writable<_OutIter, indirect_result_t<_Func, projected<iterator_t<_Range>, _Proj>>>
_LIBCPP_HIDE_FROM_ABI constexpr unary_transform_result<borrowed_iterator_t<_Range>, _OutIter>
operator()(_Range&& __range, _OutIter __result, _Func __operation, _Proj __projection = {}) const {
return __unary(ranges::begin(__range), ranges::end(__range), std::move(__result), __operation, __projection);
}
template <input_iterator _InIter1,
sentinel_for<_InIter1> _Sent1,
input_iterator _InIter2,
sentinel_for<_InIter2> _Sent2,
weakly_incrementable _OutIter,
copy_constructible _Func,
class _Proj1 = identity,
class _Proj2 = identity>
requires indirectly_writable<_OutIter,
indirect_result_t<_Func&, projected<_InIter1, _Proj1>, projected<_InIter2, _Proj2>>>
_LIBCPP_HIDE_FROM_ABI constexpr binary_transform_result<_InIter1, _InIter2, _OutIter> operator()(
_InIter1 __first1,
_Sent1 __last1,
_InIter2 __first2,
_Sent2 __last2,
_OutIter __result,
_Func __binary_operation,
_Proj1 __projection1 = {},
_Proj2 __projection2 = {}) const {
return __binary(
std::move(__first1),
std::move(__last1),
std::move(__first2),
std::move(__last2),
std::move(__result),
__binary_operation,
__projection1,
__projection2);
}
template <input_range _Range1,
input_range _Range2,
weakly_incrementable _OutIter,
copy_constructible _Func,
class _Proj1 = identity,
class _Proj2 = identity>
requires indirectly_writable<
_OutIter,
indirect_result_t<_Func&, projected<iterator_t<_Range1>, _Proj1>, projected<iterator_t<_Range2>, _Proj2>>>
_LIBCPP_HIDE_FROM_ABI constexpr binary_transform_result<borrowed_iterator_t<_Range1>,
borrowed_iterator_t<_Range2>,
_OutIter>
operator()(_Range1&& __range1,
_Range2&& __range2,
_OutIter __result,
_Func __binary_operation,
_Proj1 __projection1 = {},
_Proj2 __projection2 = {}) const {
return __binary(
ranges::begin(__range1),
ranges::end(__range1),
ranges::begin(__range2),
ranges::end(__range2),
std::move(__result),
__binary_operation,
__projection1,
__projection2);
}
};
} // namespace __transform
inline namespace __cpo {
inline constexpr auto transform = __transform::__fn{};
} // namespace __cpo
} // namespace ranges
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER >= 20
#endif // _LIBCPP___ALGORITHM_RANGES_TRANSFORM_H
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