llvm-project/libcxx/include/ext/__hash

// -*- C++ -*-
//===------------------------- hash_set ------------------------------------===//
//
// 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_EXT_HASH
#define _LIBCPP_EXT_HASH

#pragma GCC system_header

#include <string>
#include <cstring>

namespace __gnu_cxx {

template <typename _Tp> struct _LIBCPP_TEMPLATE_VIS hash { };

template <> struct _LIBCPP_TEMPLATE_VIS hash<const char*>
 : public std::unary_function<const char*, size_t>
{
    _LIBCPP_INLINE_VISIBILITY
    size_t operator()(const char *__c) const _NOEXCEPT
    {
        return std::__do_string_hash(__c, __c + strlen(__c));
    }
};

template <> struct _LIBCPP_TEMPLATE_VIS hash<char *>
 : public std::unary_function<char*, size_t>
{
    _LIBCPP_INLINE_VISIBILITY
    size_t operator()(char *__c) const _NOEXCEPT
    {
        return std::__do_string_hash<const char *>(__c, __c + strlen(__c));
    }
};

template <> struct _LIBCPP_TEMPLATE_VIS hash<char>
 : public std::unary_function<char, size_t>
{
    _LIBCPP_INLINE_VISIBILITY
    size_t operator()(char __c) const _NOEXCEPT
    {
        return __c;
    }
};

template <> struct _LIBCPP_TEMPLATE_VIS hash<signed char>
 : public std::unary_function<signed char, size_t>
{
    _LIBCPP_INLINE_VISIBILITY
    size_t operator()(signed char __c) const _NOEXCEPT
    {
        return __c;
    }
};

template <> struct _LIBCPP_TEMPLATE_VIS hash<unsigned char>
 : public std::unary_function<unsigned char, size_t>
{
    _LIBCPP_INLINE_VISIBILITY
    size_t operator()(unsigned char __c) const _NOEXCEPT
    {
        return __c;
    }
};

template <> struct _LIBCPP_TEMPLATE_VIS hash<short>
 : public std::unary_function<short, size_t>
{
    _LIBCPP_INLINE_VISIBILITY
    size_t operator()(short __c) const _NOEXCEPT
    {
        return __c;
    }
};

template <> struct _LIBCPP_TEMPLATE_VIS hash<unsigned short>
 : public std::unary_function<unsigned short, size_t>
{
    _LIBCPP_INLINE_VISIBILITY
    size_t operator()(unsigned short __c) const _NOEXCEPT
    {
        return __c;
    }
};

template <> struct _LIBCPP_TEMPLATE_VIS hash<int>
    : public std::unary_function<int, size_t>
{
    _LIBCPP_INLINE_VISIBILITY
    size_t operator()(int __c) const _NOEXCEPT
    {
        return __c;
    }
};

template <> struct _LIBCPP_TEMPLATE_VIS hash<unsigned int>
    : public std::unary_function<unsigned int, size_t>
{
    _LIBCPP_INLINE_VISIBILITY
    size_t operator()(unsigned int __c) const _NOEXCEPT
    {
        return __c;
    }
};

template <> struct _LIBCPP_TEMPLATE_VIS hash<long>
    : public std::unary_function<long, size_t>
{
    _LIBCPP_INLINE_VISIBILITY
    size_t operator()(long __c) const _NOEXCEPT
    {
        return __c;
    }
};

template <> struct _LIBCPP_TEMPLATE_VIS hash<unsigned long>
    : public std::unary_function<unsigned long, size_t>
{
    _LIBCPP_INLINE_VISIBILITY
    size_t operator()(unsigned long __c) const _NOEXCEPT
    {
        return __c;
    }
};
}

#endif  // _LIBCPP_EXT_HASH