constexpr_char_traits.h
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// -*- C++ -*-
//===-------------------- constexpr_char_traits ---------------------------===//
//
// 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 _CONSTEXPR_CHAR_TRAITS
#define _CONSTEXPR_CHAR_TRAITS
#include <string>
#include <cassert>
#include "test_macros.h"
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 TEST_CONSTEXPR_CXX14 void assign(char_type& __c1, const char_type& __c2) TEST_NOEXCEPT
{__c1 = __c2;}
static TEST_CONSTEXPR bool eq(char_type __c1, char_type __c2) TEST_NOEXCEPT
{return __c1 == __c2;}
static TEST_CONSTEXPR bool lt(char_type __c1, char_type __c2) TEST_NOEXCEPT
{return __c1 < __c2;}
static TEST_CONSTEXPR_CXX14 int compare(const char_type* __s1, const char_type* __s2, size_t __n);
static TEST_CONSTEXPR_CXX14 size_t length(const char_type* __s);
static TEST_CONSTEXPR_CXX14 const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
static TEST_CONSTEXPR_CXX14 char_type* move(char_type* __s1, const char_type* __s2, size_t __n);
static TEST_CONSTEXPR_CXX14 char_type* copy(char_type* __s1, const char_type* __s2, size_t __n);
static TEST_CONSTEXPR_CXX14 char_type* assign(char_type* __s, size_t __n, char_type __a);
static TEST_CONSTEXPR int_type not_eof(int_type __c) TEST_NOEXCEPT
{return eq_int_type(__c, eof()) ? ~eof() : __c;}
static TEST_CONSTEXPR char_type to_char_type(int_type __c) TEST_NOEXCEPT
{return char_type(__c);}
static TEST_CONSTEXPR int_type to_int_type(char_type __c) TEST_NOEXCEPT
{return int_type(__c);}
static TEST_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) TEST_NOEXCEPT
{return __c1 == __c2;}
static TEST_CONSTEXPR int_type eof() TEST_NOEXCEPT
{return int_type(EOF);}
};
template <class _CharT>
TEST_CONSTEXPR_CXX14 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>
TEST_CONSTEXPR_CXX14 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>
TEST_CONSTEXPR_CXX14 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>
TEST_CONSTEXPR_CXX14 _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>
TEST_CONSTEXPR_CXX14 _CharT*
constexpr_char_traits<_CharT>::copy(char_type* __s1, const char_type* __s2, size_t __n)
{
assert(__s2 < __s1 || __s2 >= __s1+__n);
char_type* __r = __s1;
for (; __n; --__n, ++__s1, ++__s2)
assign(*__s1, *__s2);
return __r;
}
template <class _CharT>
TEST_CONSTEXPR_CXX14 _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