c3747883a0
## Abstract This pull request converts the `operator()` of all CPOs and niebloids related to C++23 ranges to `static`. ## Motivation In `libc++`, CPOs and niebloids are implemented as function objects. Currently, the `operator()` for such a function object is a `const`-qualified member function. This means that even if the function object is has no data members, an extra register is used to pass in the `this` pointer when calling `operator()`, unless the compiler can inline the function call. Declaraing `operator()` as `static` would optimize away the unnecessary `this` pointer passing for stateless function objects, since there is no object instance state that needs to be accessed. ## Reference - [P1169R4: static `operator()`](https://wg21.link/P1169R4)
96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ALGORITHM_RANGES_STARTS_WITH_H
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#define _LIBCPP___ALGORITHM_RANGES_STARTS_WITH_H
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#include <__algorithm/in_in_result.h>
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#include <__algorithm/ranges_mismatch.h>
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#include <__config>
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#include <__functional/identity.h>
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#include <__functional/ranges_operations.h>
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#include <__iterator/concepts.h>
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#include <__iterator/indirectly_comparable.h>
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#include <__ranges/access.h>
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#include <__ranges/concepts.h>
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#include <__utility/move.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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#if _LIBCPP_STD_VER >= 23
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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namespace __starts_with {
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struct __fn {
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template <input_iterator _Iter1,
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sentinel_for<_Iter1> _Sent1,
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input_iterator _Iter2,
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sentinel_for<_Iter2> _Sent2,
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class _Pred = ranges::equal_to,
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class _Proj1 = identity,
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class _Proj2 = identity>
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requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
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_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI static constexpr bool operator()(
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_Iter1 __first1,
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_Sent1 __last1,
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_Iter2 __first2,
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_Sent2 __last2,
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_Pred __pred = {},
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_Proj1 __proj1 = {},
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_Proj2 __proj2 = {}) {
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return __mismatch::__fn::__go(
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std::move(__first1),
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std::move(__last1),
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std::move(__first2),
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std::move(__last2),
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__pred,
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__proj1,
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__proj2)
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.in2 == __last2;
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}
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template <input_range _Range1,
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input_range _Range2,
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class _Pred = ranges::equal_to,
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class _Proj1 = identity,
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class _Proj2 = identity>
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requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
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_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI static constexpr bool
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operator()(_Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) {
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return __mismatch::__fn::__go(
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ranges::begin(__range1),
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ranges::end(__range1),
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ranges::begin(__range2),
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ranges::end(__range2),
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__pred,
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__proj1,
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__proj2)
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.in2 == ranges::end(__range2);
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}
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};
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} // namespace __starts_with
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inline namespace __cpo {
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inline constexpr auto starts_with = __starts_with::__fn{};
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} // namespace __cpo
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} // namespace ranges
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_STD_VER >= 23
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___ALGORITHM_RANGES_STARTS_WITH_H
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