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