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// Character Traits for use by standard string and iostream -*- C++ -*-
// Copyright (C) 1997-2014 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file bits/char_traits.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{string}
*/
//
// ISO C++ 14882: 21 Strings library
//
#ifndef _CHAR_TRAITS_H
#define _CHAR_TRAITS_H 1
#pragma GCC system_header
#include <bits/stl_algobase.h> // std::copy, std::fill_n
#include <bits/postypes.h> // For streampos
#include <cwchar> // For WEOF, wmemmove, wmemset, etc.
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @brief Mapping from character type to associated types.
*
* @note This is an implementation class for the generic version
* of char_traits. It defines int_type, off_type, pos_type, and
* state_type. By default these are unsigned long, streamoff,
* streampos, and mbstate_t. Users who need a different set of
* types, but who don't need to change the definitions of any function
* defined in char_traits, can specialize __gnu_cxx::_Char_types
* while leaving __gnu_cxx::char_traits alone. */
template<typename _CharT>
struct _Char_types
{
typedef unsigned long int_type;
typedef std::streampos pos_type;
typedef std::streamoff off_type;
typedef std::mbstate_t state_type;
};
/**
* @brief Base class used to implement std::char_traits.
*
* @note For any given actual character type, this definition is
* probably wrong. (Most of the member functions are likely to be
* right, but the int_type and state_type typedefs, and the eof()
* member function, are likely to be wrong.) The reason this class
* exists is so users can specialize it. Classes in namespace std
* may not be specialized for fundamental types, but classes in
* namespace __gnu_cxx may be.
*
* See http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt05ch13s03.html
* for advice on how to make use of this class for @a unusual character
* types. Also, check out include/ext/pod_char_traits.h.
*/
template<typename _CharT>
struct char_traits
{
typedef _CharT char_type;
typedef typename _Char_types<_CharT>::int_type int_type;
typedef typename _Char_types<_CharT>::pos_type pos_type;
typedef typename _Char_types<_CharT>::off_type off_type;
typedef typename _Char_types<_CharT>::state_type state_type;
static void
assign(char_type& __c1, const char_type& __c2)
{ __c1 = __c2; }
static _GLIBCXX_CONSTEXPR bool
eq(const char_type& __c1, const char_type& __c2)
{ return __c1 == __c2; }
static _GLIBCXX_CONSTEXPR bool
lt(const char_type& __c1, const char_type& __c2)
{ return __c1 < __c2; }
// static int
// compare(const char_type* __s1, const char_type* __s2, std::size_t __n);
//// static std::size_t
// length(const char_type* __s);
//static const char_type*
//find(const char_type* __s, std::size_t __n, const char_type& __a);
// static char_type*
// move(char_type* __s1, const char_type* __s2, std::size_t __n);
// static char_type*
// copy(char_type* __s1, const char_type* __s2, std::size_t __n);
// static char_type*
// assign(char_type* __s, std::size_t __n, char_type __a);
static _GLIBCXX_CONSTEXPR char_type
to_char_type(const int_type& __c)
{ return static_cast<char_type>(__c); }
static _GLIBCXX_CONSTEXPR int_type
to_int_type(const char_type& __c)
{ return static_cast<int_type>(__c); }
static _GLIBCXX_CONSTEXPR bool
eq_int_type(const int_type& __c1, const int_type& __c2)
{ return __c1 == __c2; }
static _GLIBCXX_CONSTEXPR int_type
eof()
{ return static_cast<int_type>(_GLIBCXX_STDIO_EOF); }
static _GLIBCXX_CONSTEXPR int_type
not_eof(const int_type& __c)
{ return !eq_int_type(__c, eof()) ? __c : to_int_type(char_type()); }
};
template<typename _CharT>
int
// char_traits<_CharT>::
//compare(const char_type* __s1, const char_type* __s2, std::size_t __n)
//{
// for (std::size_t __i = 0; __i < __n; ++__i)
// if (lt(__s1[__i], __s2[__i]))
// return -1;
// else if (lt(__s2[__i], __s1[__i]))
// return 1;
// return 0;
// }
(const int_type& __c1, const int_type& __c2) noexcept
{ return __c1 == __c2; }
static constexpr int_type
eof() noexcept
{ return static_cast<int_type>(-1); }
static constexpr int_type
not_eof(const int_type& __c) noexcept
{ return eq_int_type(__c, eof()) ? 0 : __c; }
};
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif
//#endif // _CHAR_TRAITS_H
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