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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 > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
_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 > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
#endif // _LIBCPP___ALGORITHM_RANGES_TRANSFORM_H
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