| // -*- C++ -*- |
| //===-------_------------ constexpr_char_traits ---------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _CONSTEXPR_CHAR_TRAITS |
| #define _CONSTEXPR_CHAR_TRAITS |
| |
| #include <__config> |
| #include <string> |
| |
| |
| template <class _CharT> |
| struct constexpr_char_traits |
| { |
| typedef _CharT char_type; |
| typedef int int_type; |
| typedef std::streamoff off_type; |
| typedef std::streampos pos_type; |
| typedef std::mbstate_t state_type; |
| |
| static _LIBCPP_CONSTEXPR_AFTER_CXX11 void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT |
| {__c1 = __c2;} |
| |
| static _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT |
| {return __c1 == __c2;} |
| |
| static _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT |
| {return __c1 < __c2;} |
| |
| static _LIBCPP_CONSTEXPR_AFTER_CXX11 int compare(const char_type* __s1, const char_type* __s2, size_t __n); |
| static _LIBCPP_CONSTEXPR_AFTER_CXX11 size_t length(const char_type* __s); |
| static _LIBCPP_CONSTEXPR_AFTER_CXX11 const char_type* find(const char_type* __s, size_t __n, const char_type& __a); |
| static _LIBCPP_CONSTEXPR_AFTER_CXX11 char_type* move(char_type* __s1, const char_type* __s2, size_t __n); |
| static _LIBCPP_CONSTEXPR_AFTER_CXX11 char_type* copy(char_type* __s1, const char_type* __s2, size_t __n); |
| static _LIBCPP_CONSTEXPR_AFTER_CXX11 char_type* assign(char_type* __s, size_t __n, char_type __a); |
| |
| static _LIBCPP_CONSTEXPR int_type not_eof(int_type __c) _NOEXCEPT |
| {return eq_int_type(__c, eof()) ? ~eof() : __c;} |
| |
| static _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT |
| {return char_type(__c);} |
| |
| static _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT |
| {return int_type(__c);} |
| |
| static _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT |
| {return __c1 == __c2;} |
| |
| static _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT |
| {return int_type(EOF);} |
| }; |
| |
| |
| template <class _CharT> |
| _LIBCPP_CONSTEXPR_AFTER_CXX11 int |
| constexpr_char_traits<_CharT>::compare(const char_type* __s1, const char_type* __s2, size_t __n) |
| { |
| for (; __n; --__n, ++__s1, ++__s2) |
| { |
| if (lt(*__s1, *__s2)) |
| return -1; |
| if (lt(*__s2, *__s1)) |
| return 1; |
| } |
| return 0; |
| } |
| |
| template <class _CharT> |
| _LIBCPP_CONSTEXPR_AFTER_CXX11 size_t |
| constexpr_char_traits<_CharT>::length(const char_type* __s) |
| { |
| size_t __len = 0; |
| for (; !eq(*__s, char_type(0)); ++__s) |
| ++__len; |
| return __len; |
| } |
| |
| template <class _CharT> |
| _LIBCPP_CONSTEXPR_AFTER_CXX11 const _CharT* |
| constexpr_char_traits<_CharT>::find(const char_type* __s, size_t __n, const char_type& __a) |
| { |
| for (; __n; --__n) |
| { |
| if (eq(*__s, __a)) |
| return __s; |
| ++__s; |
| } |
| return 0; |
| } |
| |
| template <class _CharT> |
| _LIBCPP_CONSTEXPR_AFTER_CXX11 _CharT* |
| constexpr_char_traits<_CharT>::move(char_type* __s1, const char_type* __s2, size_t __n) |
| { |
| char_type* __r = __s1; |
| if (__s1 < __s2) |
| { |
| for (; __n; --__n, ++__s1, ++__s2) |
| assign(*__s1, *__s2); |
| } |
| else if (__s2 < __s1) |
| { |
| __s1 += __n; |
| __s2 += __n; |
| for (; __n; --__n) |
| assign(*--__s1, *--__s2); |
| } |
| return __r; |
| } |
| |
| template <class _CharT> |
| _LIBCPP_CONSTEXPR_AFTER_CXX11 _CharT* |
| constexpr_char_traits<_CharT>::copy(char_type* __s1, const char_type* __s2, size_t __n) |
| { |
| _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range"); |
| char_type* __r = __s1; |
| for (; __n; --__n, ++__s1, ++__s2) |
| assign(*__s1, *__s2); |
| return __r; |
| } |
| |
| template <class _CharT> |
| _LIBCPP_CONSTEXPR_AFTER_CXX11 _CharT* |
| constexpr_char_traits<_CharT>::assign(char_type* __s, size_t __n, char_type __a) |
| { |
| char_type* __r = __s; |
| for (; __n; --__n, ++__s) |
| assign(*__s, __a); |
| return __r; |
| } |
| |
| #endif // _CONSTEXPR_CHAR_TRAITS |