718 lines
22 KiB
Plaintext
718 lines
22 KiB
Plaintext
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// Components for manipulating non-owning sequences of characters -*- C++ -*-
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// Copyright (C) 2013-2019 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file string_view
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* This is a Standard C++ Library header.
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*/
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//
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// N3762 basic_string_view library
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//
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#ifndef _GLIBCXX_STRING_VIEW
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#define _GLIBCXX_STRING_VIEW 1
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#pragma GCC system_header
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#if __cplusplus >= 201703L
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#include <limits>
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#include <iosfwd>
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#include <bits/char_traits.h>
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#include <bits/functional_hash.h>
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#include <bits/range_access.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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#define __cpp_lib_string_view 201603
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// Helper for basic_string and basic_string_view members.
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constexpr size_t
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__sv_check(size_t __size, size_t __pos, const char* __s)
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{
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if (__pos > __size)
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__throw_out_of_range_fmt(__N("%s: __pos (which is %zu) > __size "
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"(which is %zu)"), __s, __pos, __size);
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return __pos;
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}
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// Helper for basic_string members.
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// NB: __sv_limit doesn't check for a bad __pos value.
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constexpr size_t
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__sv_limit(size_t __size, size_t __pos, size_t __off) noexcept
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{
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const bool __testoff = __off < __size - __pos;
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return __testoff ? __off : __size - __pos;
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}
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/**
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* @class basic_string_view <string_view>
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* @brief A non-owning reference to a string.
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*
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* @ingroup strings
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* @ingroup sequences
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*
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* @tparam _CharT Type of character
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* @tparam _Traits Traits for character type, defaults to
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* char_traits<_CharT>.
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*
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* A basic_string_view looks like this:
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*
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* @code
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* _CharT* _M_str
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* size_t _M_len
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* @endcode
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*/
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template<typename _CharT, typename _Traits = std::char_traits<_CharT>>
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class basic_string_view
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{
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static_assert(!is_array_v<_CharT>);
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static_assert(is_trivial_v<_CharT> && is_standard_layout_v<_CharT>);
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static_assert(is_same_v<_CharT, typename _Traits::char_type>);
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public:
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// types
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using traits_type = _Traits;
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using value_type = _CharT;
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using pointer = value_type*;
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using const_pointer = const value_type*;
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using reference = value_type&;
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using const_reference = const value_type&;
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using const_iterator = const value_type*;
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using iterator = const_iterator;
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using const_reverse_iterator = std::reverse_iterator<const_iterator>;
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using reverse_iterator = const_reverse_iterator;
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using size_type = size_t;
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using difference_type = ptrdiff_t;
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static constexpr size_type npos = size_type(-1);
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// [string.view.cons], construction and assignment
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constexpr
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basic_string_view() noexcept
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: _M_len{0}, _M_str{nullptr}
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{ }
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constexpr basic_string_view(const basic_string_view&) noexcept = default;
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__attribute__((__nonnull__)) constexpr
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basic_string_view(const _CharT* __str) noexcept
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: _M_len{traits_type::length(__str)},
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_M_str{__str}
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{ }
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constexpr
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basic_string_view(const _CharT* __str, size_type __len) noexcept
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: _M_len{__len}, _M_str{__str}
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{ }
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constexpr basic_string_view&
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operator=(const basic_string_view&) noexcept = default;
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// [string.view.iterators], iterator support
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constexpr const_iterator
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begin() const noexcept
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{ return this->_M_str; }
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constexpr const_iterator
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end() const noexcept
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{ return this->_M_str + this->_M_len; }
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constexpr const_iterator
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cbegin() const noexcept
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{ return this->_M_str; }
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constexpr const_iterator
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cend() const noexcept
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{ return this->_M_str + this->_M_len; }
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constexpr const_reverse_iterator
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rbegin() const noexcept
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{ return const_reverse_iterator(this->end()); }
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constexpr const_reverse_iterator
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rend() const noexcept
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{ return const_reverse_iterator(this->begin()); }
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constexpr const_reverse_iterator
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crbegin() const noexcept
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{ return const_reverse_iterator(this->end()); }
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constexpr const_reverse_iterator
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crend() const noexcept
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{ return const_reverse_iterator(this->begin()); }
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// [string.view.capacity], capacity
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constexpr size_type
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size() const noexcept
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{ return this->_M_len; }
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constexpr size_type
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length() const noexcept
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{ return _M_len; }
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constexpr size_type
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max_size() const noexcept
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{
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return (npos - sizeof(size_type) - sizeof(void*))
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/ sizeof(value_type) / 4;
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}
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[[nodiscard]] constexpr bool
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empty() const noexcept
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{ return this->_M_len == 0; }
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// [string.view.access], element access
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constexpr const_reference
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operator[](size_type __pos) const noexcept
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{
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// TODO: Assert to restore in a way compatible with the constexpr.
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// __glibcxx_assert(__pos < this->_M_len);
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return *(this->_M_str + __pos);
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}
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constexpr const_reference
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at(size_type __pos) const
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{
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if (__pos >= _M_len)
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__throw_out_of_range_fmt(__N("basic_string_view::at: __pos "
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"(which is %zu) >= this->size() "
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"(which is %zu)"), __pos, this->size());
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return *(this->_M_str + __pos);
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}
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constexpr const_reference
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front() const noexcept
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{
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// TODO: Assert to restore in a way compatible with the constexpr.
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// __glibcxx_assert(this->_M_len > 0);
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return *this->_M_str;
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}
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constexpr const_reference
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back() const noexcept
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{
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// TODO: Assert to restore in a way compatible with the constexpr.
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// __glibcxx_assert(this->_M_len > 0);
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return *(this->_M_str + this->_M_len - 1);
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}
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constexpr const_pointer
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data() const noexcept
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{ return this->_M_str; }
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// [string.view.modifiers], modifiers:
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constexpr void
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remove_prefix(size_type __n) noexcept
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{
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__glibcxx_assert(this->_M_len >= __n);
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this->_M_str += __n;
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this->_M_len -= __n;
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}
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constexpr void
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remove_suffix(size_type __n) noexcept
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{ this->_M_len -= __n; }
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constexpr void
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swap(basic_string_view& __sv) noexcept
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{
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auto __tmp = *this;
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*this = __sv;
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__sv = __tmp;
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}
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// [string.view.ops], string operations:
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size_type
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copy(_CharT* __str, size_type __n, size_type __pos = 0) const
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{
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__glibcxx_requires_string_len(__str, __n);
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__pos = std::__sv_check(size(), __pos, "basic_string_view::copy");
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const size_type __rlen = std::min(__n, _M_len - __pos);
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 2777. basic_string_view::copy should use char_traits::copy
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traits_type::copy(__str, data() + __pos, __rlen);
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return __rlen;
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}
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constexpr basic_string_view
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substr(size_type __pos = 0, size_type __n = npos) const noexcept(false)
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{
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__pos = std::__sv_check(size(), __pos, "basic_string_view::substr");
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const size_type __rlen = std::min(__n, _M_len - __pos);
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return basic_string_view{_M_str + __pos, __rlen};
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}
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constexpr int
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compare(basic_string_view __str) const noexcept
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{
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const size_type __rlen = std::min(this->_M_len, __str._M_len);
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int __ret = traits_type::compare(this->_M_str, __str._M_str, __rlen);
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if (__ret == 0)
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__ret = _S_compare(this->_M_len, __str._M_len);
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return __ret;
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}
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constexpr int
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compare(size_type __pos1, size_type __n1, basic_string_view __str) const
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{ return this->substr(__pos1, __n1).compare(__str); }
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constexpr int
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compare(size_type __pos1, size_type __n1,
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basic_string_view __str, size_type __pos2, size_type __n2) const
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{
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return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2));
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}
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__attribute__((__nonnull__)) constexpr int
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compare(const _CharT* __str) const noexcept
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{ return this->compare(basic_string_view{__str}); }
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__attribute__((__nonnull__)) constexpr int
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compare(size_type __pos1, size_type __n1, const _CharT* __str) const
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{ return this->substr(__pos1, __n1).compare(basic_string_view{__str}); }
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constexpr int
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compare(size_type __pos1, size_type __n1,
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const _CharT* __str, size_type __n2) const noexcept(false)
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{
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return this->substr(__pos1, __n1)
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.compare(basic_string_view(__str, __n2));
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}
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#if __cplusplus > 201703L
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constexpr bool
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starts_with(basic_string_view __x) const noexcept
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{ return this->substr(0, __x.size()) == __x; }
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constexpr bool
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starts_with(_CharT __x) const noexcept
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{ return !this->empty() && traits_type::eq(this->front(), __x); }
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constexpr bool
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starts_with(const _CharT* __x) const noexcept
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{ return this->starts_with(basic_string_view(__x)); }
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constexpr bool
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ends_with(basic_string_view __x) const noexcept
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{
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return this->size() >= __x.size()
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&& this->compare(this->size() - __x.size(), npos, __x) == 0;
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}
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constexpr bool
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ends_with(_CharT __x) const noexcept
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{ return !this->empty() && traits_type::eq(this->back(), __x); }
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constexpr bool
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ends_with(const _CharT* __x) const noexcept
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{ return this->ends_with(basic_string_view(__x)); }
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#endif // C++20
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// [string.view.find], searching
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constexpr size_type
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find(basic_string_view __str, size_type __pos = 0) const noexcept
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{ return this->find(__str._M_str, __pos, __str._M_len); }
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constexpr size_type
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find(_CharT __c, size_type __pos = 0) const noexcept;
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constexpr size_type
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find(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
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__attribute__((__nonnull__)) constexpr size_type
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find(const _CharT* __str, size_type __pos = 0) const noexcept
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{ return this->find(__str, __pos, traits_type::length(__str)); }
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constexpr size_type
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rfind(basic_string_view __str, size_type __pos = npos) const noexcept
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{ return this->rfind(__str._M_str, __pos, __str._M_len); }
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constexpr size_type
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rfind(_CharT __c, size_type __pos = npos) const noexcept;
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constexpr size_type
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rfind(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
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__attribute__((__nonnull__)) constexpr size_type
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rfind(const _CharT* __str, size_type __pos = npos) const noexcept
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{ return this->rfind(__str, __pos, traits_type::length(__str)); }
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constexpr size_type
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find_first_of(basic_string_view __str, size_type __pos = 0) const noexcept
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|
|
{ return this->find_first_of(__str._M_str, __pos, __str._M_len); }
|
||
|
|
|
||
|
|
constexpr size_type
|
||
|
|
find_first_of(_CharT __c, size_type __pos = 0) const noexcept
|
||
|
|
{ return this->find(__c, __pos); }
|
||
|
|
|
||
|
|
constexpr size_type
|
||
|
|
find_first_of(const _CharT* __str, size_type __pos,
|
||
|
|
size_type __n) const noexcept;
|
||
|
|
|
||
|
|
__attribute__((__nonnull__)) constexpr size_type
|
||
|
|
find_first_of(const _CharT* __str, size_type __pos = 0) const noexcept
|
||
|
|
{ return this->find_first_of(__str, __pos, traits_type::length(__str)); }
|
||
|
|
|
||
|
|
constexpr size_type
|
||
|
|
find_last_of(basic_string_view __str,
|
||
|
|
size_type __pos = npos) const noexcept
|
||
|
|
{ return this->find_last_of(__str._M_str, __pos, __str._M_len); }
|
||
|
|
|
||
|
|
constexpr size_type
|
||
|
|
find_last_of(_CharT __c, size_type __pos=npos) const noexcept
|
||
|
|
{ return this->rfind(__c, __pos); }
|
||
|
|
|
||
|
|
constexpr size_type
|
||
|
|
find_last_of(const _CharT* __str, size_type __pos,
|
||
|
|
size_type __n) const noexcept;
|
||
|
|
|
||
|
|
__attribute__((__nonnull__)) constexpr size_type
|
||
|
|
find_last_of(const _CharT* __str, size_type __pos = npos) const noexcept
|
||
|
|
{ return this->find_last_of(__str, __pos, traits_type::length(__str)); }
|
||
|
|
|
||
|
|
constexpr size_type
|
||
|
|
find_first_not_of(basic_string_view __str,
|
||
|
|
size_type __pos = 0) const noexcept
|
||
|
|
{ return this->find_first_not_of(__str._M_str, __pos, __str._M_len); }
|
||
|
|
|
||
|
|
constexpr size_type
|
||
|
|
find_first_not_of(_CharT __c, size_type __pos = 0) const noexcept;
|
||
|
|
|
||
|
|
constexpr size_type
|
||
|
|
find_first_not_of(const _CharT* __str,
|
||
|
|
size_type __pos, size_type __n) const noexcept;
|
||
|
|
|
||
|
|
__attribute__((__nonnull__)) constexpr size_type
|
||
|
|
find_first_not_of(const _CharT* __str, size_type __pos = 0) const noexcept
|
||
|
|
{
|
||
|
|
return this->find_first_not_of(__str, __pos,
|
||
|
|
traits_type::length(__str));
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr size_type
|
||
|
|
find_last_not_of(basic_string_view __str,
|
||
|
|
size_type __pos = npos) const noexcept
|
||
|
|
{ return this->find_last_not_of(__str._M_str, __pos, __str._M_len); }
|
||
|
|
|
||
|
|
constexpr size_type
|
||
|
|
find_last_not_of(_CharT __c, size_type __pos = npos) const noexcept;
|
||
|
|
|
||
|
|
constexpr size_type
|
||
|
|
find_last_not_of(const _CharT* __str,
|
||
|
|
size_type __pos, size_type __n) const noexcept;
|
||
|
|
|
||
|
|
__attribute__((__nonnull__)) constexpr size_type
|
||
|
|
find_last_not_of(const _CharT* __str,
|
||
|
|
size_type __pos = npos) const noexcept
|
||
|
|
{
|
||
|
|
return this->find_last_not_of(__str, __pos,
|
||
|
|
traits_type::length(__str));
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
|
||
|
|
static constexpr int
|
||
|
|
_S_compare(size_type __n1, size_type __n2) noexcept
|
||
|
|
{
|
||
|
|
const difference_type __diff = __n1 - __n2;
|
||
|
|
if (__diff > std::numeric_limits<int>::max())
|
||
|
|
return std::numeric_limits<int>::max();
|
||
|
|
if (__diff < std::numeric_limits<int>::min())
|
||
|
|
return std::numeric_limits<int>::min();
|
||
|
|
return static_cast<int>(__diff);
|
||
|
|
}
|
||
|
|
|
||
|
|
size_t _M_len;
|
||
|
|
const _CharT* _M_str;
|
||
|
|
};
|
||
|
|
|
||
|
|
// [string.view.comparison], non-member basic_string_view comparison function
|
||
|
|
|
||
|
|
namespace __detail
|
||
|
|
{
|
||
|
|
// Identity transform to create a non-deduced context, so that only one
|
||
|
|
// argument participates in template argument deduction and the other
|
||
|
|
// argument gets implicitly converted to the deduced type. See n3766.html.
|
||
|
|
template<typename _Tp>
|
||
|
|
using __idt = common_type_t<_Tp>;
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator==(basic_string_view<_CharT, _Traits> __x,
|
||
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
||
|
|
{ return __x.size() == __y.size() && __x.compare(__y) == 0; }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator==(basic_string_view<_CharT, _Traits> __x,
|
||
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
||
|
|
{ return __x.size() == __y.size() && __x.compare(__y) == 0; }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator==(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
||
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
||
|
|
{ return __x.size() == __y.size() && __x.compare(__y) == 0; }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator!=(basic_string_view<_CharT, _Traits> __x,
|
||
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
||
|
|
{ return !(__x == __y); }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator!=(basic_string_view<_CharT, _Traits> __x,
|
||
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
||
|
|
{ return !(__x == __y); }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator!=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
||
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
||
|
|
{ return !(__x == __y); }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator< (basic_string_view<_CharT, _Traits> __x,
|
||
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
||
|
|
{ return __x.compare(__y) < 0; }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator< (basic_string_view<_CharT, _Traits> __x,
|
||
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
||
|
|
{ return __x.compare(__y) < 0; }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator< (__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
||
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
||
|
|
{ return __x.compare(__y) < 0; }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator> (basic_string_view<_CharT, _Traits> __x,
|
||
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
||
|
|
{ return __x.compare(__y) > 0; }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator> (basic_string_view<_CharT, _Traits> __x,
|
||
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
||
|
|
{ return __x.compare(__y) > 0; }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator> (__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
||
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
||
|
|
{ return __x.compare(__y) > 0; }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator<=(basic_string_view<_CharT, _Traits> __x,
|
||
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
||
|
|
{ return __x.compare(__y) <= 0; }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator<=(basic_string_view<_CharT, _Traits> __x,
|
||
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
||
|
|
{ return __x.compare(__y) <= 0; }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator<=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
||
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
||
|
|
{ return __x.compare(__y) <= 0; }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator>=(basic_string_view<_CharT, _Traits> __x,
|
||
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
||
|
|
{ return __x.compare(__y) >= 0; }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator>=(basic_string_view<_CharT, _Traits> __x,
|
||
|
|
__detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept
|
||
|
|
{ return __x.compare(__y) >= 0; }
|
||
|
|
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
constexpr bool
|
||
|
|
operator>=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
|
||
|
|
basic_string_view<_CharT, _Traits> __y) noexcept
|
||
|
|
{ return __x.compare(__y) >= 0; }
|
||
|
|
|
||
|
|
// [string.view.io], Inserters and extractors
|
||
|
|
template<typename _CharT, typename _Traits>
|
||
|
|
inline basic_ostream<_CharT, _Traits>&
|
||
|
|
operator<<(basic_ostream<_CharT, _Traits>& __os,
|
||
|
|
basic_string_view<_CharT,_Traits> __str)
|
||
|
|
{ return __ostream_insert(__os, __str.data(), __str.size()); }
|
||
|
|
|
||
|
|
|
||
|
|
// basic_string_view typedef names
|
||
|
|
|
||
|
|
using string_view = basic_string_view<char>;
|
||
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
||
|
|
using wstring_view = basic_string_view<wchar_t>;
|
||
|
|
#endif
|
||
|
|
#ifdef _GLIBCXX_USE_CHAR8_T
|
||
|
|
using u8string_view = basic_string_view<char8_t>;
|
||
|
|
#endif
|
||
|
|
using u16string_view = basic_string_view<char16_t>;
|
||
|
|
using u32string_view = basic_string_view<char32_t>;
|
||
|
|
|
||
|
|
// [string.view.hash], hash support:
|
||
|
|
|
||
|
|
template<typename _Tp>
|
||
|
|
struct hash;
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct hash<string_view>
|
||
|
|
: public __hash_base<size_t, string_view>
|
||
|
|
{
|
||
|
|
size_t
|
||
|
|
operator()(const string_view& __str) const noexcept
|
||
|
|
{ return std::_Hash_impl::hash(__str.data(), __str.length()); }
|
||
|
|
};
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct __is_fast_hash<hash<string_view>> : std::false_type
|
||
|
|
{ };
|
||
|
|
|
||
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
||
|
|
template<>
|
||
|
|
struct hash<wstring_view>
|
||
|
|
: public __hash_base<size_t, wstring_view>
|
||
|
|
{
|
||
|
|
size_t
|
||
|
|
operator()(const wstring_view& __s) const noexcept
|
||
|
|
{ return std::_Hash_impl::hash(__s.data(),
|
||
|
|
__s.length() * sizeof(wchar_t)); }
|
||
|
|
};
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct __is_fast_hash<hash<wstring_view>> : std::false_type
|
||
|
|
{ };
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef _GLIBCXX_USE_CHAR8_T
|
||
|
|
template<>
|
||
|
|
struct hash<u8string_view>
|
||
|
|
: public __hash_base<size_t, u8string_view>
|
||
|
|
{
|
||
|
|
size_t
|
||
|
|
operator()(const u8string_view& __str) const noexcept
|
||
|
|
{ return std::_Hash_impl::hash(__str.data(), __str.length()); }
|
||
|
|
};
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct __is_fast_hash<hash<u8string_view>> : std::false_type
|
||
|
|
{ };
|
||
|
|
#endif
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct hash<u16string_view>
|
||
|
|
: public __hash_base<size_t, u16string_view>
|
||
|
|
{
|
||
|
|
size_t
|
||
|
|
operator()(const u16string_view& __s) const noexcept
|
||
|
|
{ return std::_Hash_impl::hash(__s.data(),
|
||
|
|
__s.length() * sizeof(char16_t)); }
|
||
|
|
};
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct __is_fast_hash<hash<u16string_view>> : std::false_type
|
||
|
|
{ };
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct hash<u32string_view>
|
||
|
|
: public __hash_base<size_t, u32string_view>
|
||
|
|
{
|
||
|
|
size_t
|
||
|
|
operator()(const u32string_view& __s) const noexcept
|
||
|
|
{ return std::_Hash_impl::hash(__s.data(),
|
||
|
|
__s.length() * sizeof(char32_t)); }
|
||
|
|
};
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct __is_fast_hash<hash<u32string_view>> : std::false_type
|
||
|
|
{ };
|
||
|
|
|
||
|
|
inline namespace literals
|
||
|
|
{
|
||
|
|
inline namespace string_view_literals
|
||
|
|
{
|
||
|
|
#pragma GCC diagnostic push
|
||
|
|
#pragma GCC diagnostic ignored "-Wliteral-suffix"
|
||
|
|
inline constexpr basic_string_view<char>
|
||
|
|
operator""sv(const char* __str, size_t __len) noexcept
|
||
|
|
{ return basic_string_view<char>{__str, __len}; }
|
||
|
|
|
||
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
||
|
|
inline constexpr basic_string_view<wchar_t>
|
||
|
|
operator""sv(const wchar_t* __str, size_t __len) noexcept
|
||
|
|
{ return basic_string_view<wchar_t>{__str, __len}; }
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef _GLIBCXX_USE_CHAR8_T
|
||
|
|
inline constexpr basic_string_view<char8_t>
|
||
|
|
operator""sv(const char8_t* __str, size_t __len) noexcept
|
||
|
|
{ return basic_string_view<char8_t>{__str, __len}; }
|
||
|
|
#endif
|
||
|
|
|
||
|
|
inline constexpr basic_string_view<char16_t>
|
||
|
|
operator""sv(const char16_t* __str, size_t __len) noexcept
|
||
|
|
{ return basic_string_view<char16_t>{__str, __len}; }
|
||
|
|
|
||
|
|
inline constexpr basic_string_view<char32_t>
|
||
|
|
operator""sv(const char32_t* __str, size_t __len) noexcept
|
||
|
|
{ return basic_string_view<char32_t>{__str, __len}; }
|
||
|
|
|
||
|
|
#pragma GCC diagnostic pop
|
||
|
|
} // namespace string_literals
|
||
|
|
} // namespace literals
|
||
|
|
|
||
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
||
|
|
} // namespace std
|
||
|
|
|
||
|
|
#include <bits/string_view.tcc>
|
||
|
|
|
||
|
|
#endif // __cplusplus <= 201402L
|
||
|
|
|
||
|
|
#endif // _GLIBCXX_EXPERIMENTAL_STRING_VIEW
|