bits/string_view.tcc
Go to the documentation of this file.
// Components for manipulating non-owning sequences of characters -*- C++ -*-
// Copyright (C) 2013-2021 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 include/bits/string_view.tcc
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{string_view}
*/
//
// N3762 basic_string_view library
//
#ifndef _GLIBCXX_STRING_VIEW_TCC
#define _GLIBCXX_STRING_VIEW_TCC 1
#pragma GCC system_header
#if __cplusplus >= 201703L
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _CharT, typename _Traits>
constexpr typename basic_string_view<_CharT, _Traits>::size_type
basic_string_view<_CharT, _Traits>::
find(const _CharT* __str, size_type __pos, size_type __n) const noexcept
{
__glibcxx_requires_string_len(__str, __n);
if (__n == 0)
return __pos <= _M_len ? __pos : npos;
if (__pos >= _M_len)
return npos;
const _CharT __elem0 = __str[0];
const _CharT* __first = _M_str + __pos;
const _CharT* const __last = _M_str + _M_len;
size_type __len = _M_len - __pos;
while (__len >= __n)
{
// Find the first occurrence of __elem0:
__first = traits_type::find(__first, __len - __n + 1, __elem0);
if (!__first)
return npos;
// Compare the full strings from the first occurrence of __elem0.
// We already know that __first[0] == __s[0] but compare them again
// anyway because __s is probably aligned, which helps memcmp.
if (traits_type::compare(__first, __str, __n) == 0)
return __first - _M_str;
__len = __last - ++__first;
}
return npos;
}
template<typename _CharT, typename _Traits>
constexpr typename basic_string_view<_CharT, _Traits>::size_type
basic_string_view<_CharT, _Traits>::
find(_CharT __c, size_type __pos) const noexcept
{
size_type __ret = npos;
if (__pos < this->_M_len)
{
const size_type __n = this->_M_len - __pos;
const _CharT* __p = traits_type::find(this->_M_str + __pos, __n, __c);
if (__p)
__ret = __p - this->_M_str;
}
return __ret;
}
template<typename _CharT, typename _Traits>
constexpr typename basic_string_view<_CharT, _Traits>::size_type
basic_string_view<_CharT, _Traits>::
rfind(const _CharT* __str, size_type __pos, size_type __n) const noexcept
{
__glibcxx_requires_string_len(__str, __n);
if (__n <= this->_M_len)
{
__pos = std::min(size_type(this->_M_len - __n), __pos);
do
{
if (traits_type::compare(this->_M_str + __pos, __str, __n) == 0)
return __pos;
}
while (__pos-- > 0);
}
return npos;
}
template<typename _CharT, typename _Traits>
constexpr typename basic_string_view<_CharT, _Traits>::size_type
basic_string_view<_CharT, _Traits>::
rfind(_CharT __c, size_type __pos) const noexcept
{
size_type __size = this->_M_len;
if (__size > 0)
{
if (--__size > __pos)
__size = __pos;
for (++__size; __size-- > 0; )
if (traits_type::eq(this->_M_str[__size], __c))
return __size;
}
return npos;
}
template<typename _CharT, typename _Traits>
constexpr typename basic_string_view<_CharT, _Traits>::size_type
basic_string_view<_CharT, _Traits>::
find_first_of(const _CharT* __str, size_type __pos,
size_type __n) const noexcept
{
__glibcxx_requires_string_len(__str, __n);
for (; __n && __pos < this->_M_len; ++__pos)
{
const _CharT* __p = traits_type::find(__str, __n,
this->_M_str[__pos]);
if (__p)
return __pos;
}
return npos;
}
template<typename _CharT, typename _Traits>
constexpr typename basic_string_view<_CharT, _Traits>::size_type
basic_string_view<_CharT, _Traits>::
find_last_of(const _CharT* __str, size_type __pos,
size_type __n) const noexcept
{
__glibcxx_requires_string_len(__str, __n);
size_type __size = this->size();
if (__size && __n)
{
if (--__size > __pos)
__size = __pos;
do
{
if (traits_type::find(__str, __n, this->_M_str[__size]))
return __size;
}
while (__size-- != 0);
}
return npos;
}
template<typename _CharT, typename _Traits>
constexpr typename basic_string_view<_CharT, _Traits>::size_type
basic_string_view<_CharT, _Traits>::
find_first_not_of(const _CharT* __str, size_type __pos,
size_type __n) const noexcept
{
__glibcxx_requires_string_len(__str, __n);
for (; __pos < this->_M_len; ++__pos)
if (!traits_type::find(__str, __n, this->_M_str[__pos]))
return __pos;
return npos;
}
template<typename _CharT, typename _Traits>
constexpr typename basic_string_view<_CharT, _Traits>::size_type
basic_string_view<_CharT, _Traits>::
find_first_not_of(_CharT __c, size_type __pos) const noexcept
{
for (; __pos < this->_M_len; ++__pos)
if (!traits_type::eq(this->_M_str[__pos], __c))
return __pos;
return npos;
}
template<typename _CharT, typename _Traits>
constexpr typename basic_string_view<_CharT, _Traits>::size_type
basic_string_view<_CharT, _Traits>::
find_last_not_of(const _CharT* __str, size_type __pos,
size_type __n) const noexcept
{
__glibcxx_requires_string_len(__str, __n);
size_type __size = this->_M_len;
if (__size)
{
if (--__size > __pos)
__size = __pos;
do
{
if (!traits_type::find(__str, __n, this->_M_str[__size]))
return __size;
}
while (__size--);
}
return npos;
}
template<typename _CharT, typename _Traits>
constexpr typename basic_string_view<_CharT, _Traits>::size_type
basic_string_view<_CharT, _Traits>::
find_last_not_of(_CharT __c, size_type __pos) const noexcept
{
size_type __size = this->_M_len;
if (__size)
{
if (--__size > __pos)
__size = __pos;
do
{
if (!traits_type::eq(this->_M_str[__size], __c))
return __size;
}
while (__size--);
}
return npos;
}
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // __cplusplus <= 201402L
#endif // _GLIBCXX_STRING_VIEW_TCC
std::min
constexpr const _Tp & min(const _Tp &, const _Tp &)
This does what you think it does.
Definition stl_algobase.h:230
std
ISO C++ entities toplevel namespace is std.
std::size
constexpr auto size(const _Container &__cont) noexcept(noexcept(__cont.size())) -> decltype(__cont.size())
Return the size of a container.
Definition range_access.h:245
std::basic_string_view
A non-owning reference to a string.
Definition string_view:99
std::size_type