char_tra.h
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上传日期:2022-05-14
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文件大小:4k
源码类别:
STL
开发平台:
Visual C++
- /*
- * Copyright (c) 1997
- * Silicon Graphics Computer Systems, Inc.
- *
- * Permission to use, copy, modify, distribute and sell this software
- * and its documentation for any purpose is hereby granted without fee,
- * provided that the above copyright notice appear in all copies and
- * that both that copyright notice and this permission notice appear
- * in supporting documentation. Silicon Graphics makes no
- * representations about the suitability of this software for any
- * purpose. It is provided "as is" without express or implied warranty.
- */
- #ifndef __SGI_STL_CHAR_TRAITS_H
- #define __SGI_STL_CHAR_TRAITS_H
- #include <string.h>
- #include <wchar.h>
- #if defined(__STL_USE_NEW_IOSTREAMS) && !defined(__SGI_STL_IOSFWD)
- #include <iosfwd>
- #endif /* use new iostreams */
- __STL_BEGIN_NAMESPACE
- // Class __char_traits_base.
- template <class _CharT, class _IntT> class __char_traits_base {
- public:
- typedef _CharT char_type;
- typedef _IntT int_type;
- #ifdef __STL_USE_NEW_IOSTREAMS
- typedef streamoff off_type;
- typedef streampos pos_type;
- typedef mbstate_t state_type;
- #endif /* __STL_USE_NEW_IOSTREAMS */
- static void assign(char_type& __c1, const char_type& __c2) { __c1 = __c2; }
- static bool eq(const _CharT& __c1, const _CharT& __c2)
- { return __c1 == __c2; }
- static bool lt(const _CharT& __c1, const _CharT& __c2)
- { return __c1 < __c2; }
- static int compare(const _CharT* __s1, const _CharT* __s2, size_t __n) {
- for (size_t __i = 0; __i < __n; ++__i)
- if (!eq(__s1[__i], __s2[__i]))
- return __s1[__i] < __s2[__i] ? -1 : 1;
- return 0;
- }
- static size_t length(const _CharT* __s) {
- const _CharT __nullchar = _CharT();
- size_t __i;
- for (__i = 0; !eq(__s[__i], __nullchar); ++__i)
- {}
- return __i;
- }
- static const _CharT* find(const _CharT* __s, size_t __n, const _CharT& __c)
- {
- for ( ; __n > 0 ; ++__s, --__n)
- if (eq(*__s, __c))
- return __s;
- return 0;
- }
- static _CharT* move(_CharT* __s1, const _CharT* __s2, size_t __n) {
- memmove(__s1, __s2, __n * sizeof(_CharT));
- return __s1;
- }
- static _CharT* copy(_CharT* __s1, const _CharT* __s2, size_t __n) {
- memcpy(__s1, __s2, __n * sizeof(_CharT));
- return __s1;
- }
- static _CharT* assign(_CharT* __s, size_t __n, _CharT __c) {
- for (size_t __i = 0; __i < __n; ++__i)
- __s[__i] = __c;
- return __s;
- }
- static int_type not_eof(const int_type& __c) {
- return !eq_int_type(__c, eof()) ? __c : 0;
- }
- static char_type to_char_type(const int_type& __c) {
- return static_cast<char_type>(__c);
- }
- static int_type to_int_type(const char_type& __c) {
- return static_cast<int_type>(__c);
- }
- static bool eq_int_type(const int_type& __c1, const int_type& __c2) {
- return __c1 == __c2;
- }
- static int_type eof() {
- return static_cast<int_type>(-1);
- }
- };
- // Generic char_traits class. Note that this class is provided only
- // as a base for explicit specialization; it is unlikely to be useful
- // as is for any particular user-defined type. In particular, it
- // *will not work* for a non-POD type.
- template <class _CharT> class char_traits
- : public __char_traits_base<_CharT, _CharT>
- {};
- // Specialization for char.
- __STL_TEMPLATE_NULL class char_traits<char>
- : public __char_traits_base<char, int>
- {
- public:
- static char_type to_char_type(const int_type& __c) {
- return static_cast<char_type>(static_cast<unsigned char>(__c));
- }
- static int_type to_int_type(const char_type& __c) {
- return static_cast<unsigned char>(__c);
- }
- static int compare(const char* __s1, const char* __s2, size_t __n)
- { return memcmp(__s1, __s2, __n); }
- static size_t length(const char* __s) { return strlen(__s); }
- static void assign(char& __c1, const char& __c2) { __c1 = __c2; }
- static char* assign(char* __s, size_t __n, char __c)
- { memset(__s, __c, __n); return __s; }
- };
- // Specialization for wchar_t.
- __STL_TEMPLATE_NULL class char_traits<wchar_t>
- : public __char_traits_base<wchar_t, wint_t>
- {};
- __STL_END_NAMESPACE
- #endif /* __SGI_STL_CHAR_TRAITS_H */
- // Local Variables:
- // mode:C++
- // End: