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119cef40d1
Libc++ tried accomodating systems that need to be able to define various __need_FOO macros before including C library headers, however it does not appear to be needed anymore in most cases. Indeed, glibc used to use that system to conditionally provide definitions, however almost all instances of these macros have been removed from glibc years ago. I think the next step would be to also fix Clang's own builtin headers to stop needing these macros. Differential Revision: https://reviews.llvm.org/D131425
136 lines
3.2 KiB
C++
136 lines
3.2 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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_EXT_HASH
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#define _LIBCPP_EXT_HASH
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# pragma GCC system_header
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#include <__config>
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#include <cstring>
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#include <stddef.h>
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#include <string>
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namespace __gnu_cxx {
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template <typename _Tp> struct _LIBCPP_TEMPLATE_VIS hash { };
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template <> struct _LIBCPP_TEMPLATE_VIS hash<const char*>
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: public std::__unary_function<const char*, size_t>
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{
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(const char *__c) const _NOEXCEPT
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{
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return std::__do_string_hash(__c, __c + strlen(__c));
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}
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};
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template <> struct _LIBCPP_TEMPLATE_VIS hash<char *>
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: public std::__unary_function<char*, size_t>
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{
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(char *__c) const _NOEXCEPT
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{
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return std::__do_string_hash<const char *>(__c, __c + strlen(__c));
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}
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};
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template <> struct _LIBCPP_TEMPLATE_VIS hash<char>
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: public std::__unary_function<char, size_t>
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{
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(char __c) const _NOEXCEPT
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{
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return __c;
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}
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};
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template <> struct _LIBCPP_TEMPLATE_VIS hash<signed char>
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: public std::__unary_function<signed char, size_t>
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{
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(signed char __c) const _NOEXCEPT
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{
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return __c;
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}
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};
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template <> struct _LIBCPP_TEMPLATE_VIS hash<unsigned char>
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: public std::__unary_function<unsigned char, size_t>
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{
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(unsigned char __c) const _NOEXCEPT
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{
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return __c;
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}
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};
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template <> struct _LIBCPP_TEMPLATE_VIS hash<short>
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: public std::__unary_function<short, size_t>
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{
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(short __c) const _NOEXCEPT
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{
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return __c;
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}
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};
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template <> struct _LIBCPP_TEMPLATE_VIS hash<unsigned short>
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: public std::__unary_function<unsigned short, size_t>
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{
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(unsigned short __c) const _NOEXCEPT
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{
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return __c;
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}
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};
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template <> struct _LIBCPP_TEMPLATE_VIS hash<int>
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: public std::__unary_function<int, size_t>
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{
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(int __c) const _NOEXCEPT
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{
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return __c;
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}
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};
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template <> struct _LIBCPP_TEMPLATE_VIS hash<unsigned int>
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: public std::__unary_function<unsigned int, size_t>
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{
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(unsigned int __c) const _NOEXCEPT
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{
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return __c;
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}
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};
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template <> struct _LIBCPP_TEMPLATE_VIS hash<long>
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: public std::__unary_function<long, size_t>
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{
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(long __c) const _NOEXCEPT
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{
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return __c;
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}
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};
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template <> struct _LIBCPP_TEMPLATE_VIS hash<unsigned long>
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: public std::__unary_function<unsigned long, size_t>
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{
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(unsigned long __c) const _NOEXCEPT
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{
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return __c;
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}
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};
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} // namespace __gnu_cxx
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#endif // _LIBCPP_EXT_HASH
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