692 lines
30 KiB
C++
692 lines
30 KiB
C++
/*
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Copyright (c) Marshall Clow 2012-2015.
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Copyright (c) Beman Dawes 2015
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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For more information, see http://www.boost.org
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Based on the StringRef implementation in LLVM (http://llvm.org) and
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N3422 by Jeffrey Yasskin
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http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3442.html
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Updated July 2015 to reflect the Library Fundamentals TS
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http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4480.html
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*/
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#ifndef BOOST_STRING_VIEW_HPP
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#define BOOST_STRING_VIEW_HPP
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#include <boost/config.hpp>
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#include <boost/detail/workaround.hpp>
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#include <boost/utility/string_view_fwd.hpp>
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#include <boost/throw_exception.hpp>
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#include <cstddef>
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#include <stdexcept>
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#include <algorithm>
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#include <iterator>
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#include <string>
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#include <cstring>
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#include <iosfwd>
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#if defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) || (defined(BOOST_GCC) && ((BOOST_GCC+0) / 100) <= 406)
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// GCC 4.6 cannot handle a defaulted function with noexcept specifier
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#define BOOST_STRING_VIEW_NO_CXX11_DEFAULTED_NOEXCEPT_FUNCTIONS
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#endif
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namespace boost {
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namespace detail {
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// A helper functor because sometimes we don't have lambdas
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template <typename charT, typename traits>
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class string_view_traits_eq {
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public:
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string_view_traits_eq ( charT ch ) : ch_(ch) {}
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bool operator()( charT val ) const { return traits::eq (ch_, val); }
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charT ch_;
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};
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}
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template<typename charT, typename traits> // traits defaulted in string_view_fwd.hpp
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class basic_string_view {
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public:
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// types
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typedef traits traits_type;
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typedef charT value_type;
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typedef charT* pointer;
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typedef const charT* const_pointer;
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typedef charT& reference;
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typedef const charT& const_reference;
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typedef const_pointer const_iterator; // impl-defined
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typedef const_iterator iterator;
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typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
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typedef const_reverse_iterator reverse_iterator;
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typedef std::size_t size_type;
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typedef std::ptrdiff_t difference_type;
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static BOOST_CONSTEXPR_OR_CONST size_type npos = size_type(-1);
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// construct/copy
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BOOST_CONSTEXPR basic_string_view() BOOST_NOEXCEPT
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: ptr_(NULL), len_(0) {}
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// by defaulting these functions, basic_string_ref becomes
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// trivially copy/move constructible.
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BOOST_CONSTEXPR basic_string_view(const basic_string_view &rhs) BOOST_NOEXCEPT
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#ifndef BOOST_STRING_VIEW_NO_CXX11_DEFAULTED_NOEXCEPT_FUNCTIONS
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= default;
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#else
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: ptr_(rhs.ptr_), len_(rhs.len_) {}
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#endif
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basic_string_view& operator=(const basic_string_view &rhs) BOOST_NOEXCEPT
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#ifndef BOOST_STRING_VIEW_NO_CXX11_DEFAULTED_NOEXCEPT_FUNCTIONS
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= default;
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#else
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{
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ptr_ = rhs.ptr_;
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len_ = rhs.len_;
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return *this;
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}
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#endif
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template<typename Allocator>
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basic_string_view(const std::basic_string<charT, traits,
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Allocator>& str) BOOST_NOEXCEPT
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: ptr_(str.data()), len_(str.length()) {}
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BOOST_CONSTEXPR basic_string_view(const charT* str)
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: ptr_(str), len_(traits::length(str)) {}
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BOOST_CONSTEXPR basic_string_view(const charT* str, size_type len)
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: ptr_(str), len_(len) {}
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// iterators
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BOOST_CONSTEXPR const_iterator begin() const BOOST_NOEXCEPT { return ptr_; }
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BOOST_CONSTEXPR const_iterator cbegin() const BOOST_NOEXCEPT { return ptr_; }
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BOOST_CONSTEXPR const_iterator end() const BOOST_NOEXCEPT { return ptr_ + len_; }
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BOOST_CONSTEXPR const_iterator cend() const BOOST_NOEXCEPT { return ptr_ + len_; }
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const_reverse_iterator rbegin() const BOOST_NOEXCEPT { return const_reverse_iterator(end()); }
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const_reverse_iterator crbegin() const BOOST_NOEXCEPT { return const_reverse_iterator(end()); }
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const_reverse_iterator rend() const BOOST_NOEXCEPT { return const_reverse_iterator(begin()); }
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const_reverse_iterator crend() const BOOST_NOEXCEPT { return const_reverse_iterator(begin()); }
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// capacity
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BOOST_CONSTEXPR size_type size() const BOOST_NOEXCEPT { return len_; }
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BOOST_CONSTEXPR size_type length() const BOOST_NOEXCEPT { return len_; }
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BOOST_CONSTEXPR size_type max_size() const BOOST_NOEXCEPT { return len_; }
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BOOST_CONSTEXPR bool empty() const BOOST_NOEXCEPT { return len_ == 0; }
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// element access
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BOOST_CONSTEXPR const_reference operator[](size_type pos) const BOOST_NOEXCEPT { return ptr_[pos]; }
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BOOST_CONSTEXPR const_reference at(size_t pos) const {
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return pos >= len_ ? BOOST_THROW_EXCEPTION(std::out_of_range("boost::string_view::at")) : ptr_[pos];
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// if ( pos >= len_ )
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// BOOST_THROW_EXCEPTION( std::out_of_range ( "boost::string_view::at" ) );
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// return ptr_[pos];
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}
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BOOST_CONSTEXPR const_reference front() const { return ptr_[0]; }
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BOOST_CONSTEXPR const_reference back() const { return ptr_[len_-1]; }
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BOOST_CONSTEXPR const_pointer data() const BOOST_NOEXCEPT { return ptr_; }
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// modifiers
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void clear() BOOST_NOEXCEPT { len_ = 0; } // Boost extension
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BOOST_CXX14_CONSTEXPR void remove_prefix(size_type n) {
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if ( n > len_ )
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n = len_;
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ptr_ += n;
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len_ -= n;
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}
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BOOST_CXX14_CONSTEXPR void remove_suffix(size_type n) {
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if ( n > len_ )
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n = len_;
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len_ -= n;
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}
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BOOST_CXX14_CONSTEXPR void swap(basic_string_view& s) BOOST_NOEXCEPT {
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std::swap(ptr_, s.ptr_);
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std::swap(len_, s.len_);
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}
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// basic_string_view string operations
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#ifndef BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
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template<typename Allocator>
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explicit operator std::basic_string<charT, traits, Allocator>() const {
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return std::basic_string<charT, traits, Allocator>(begin(), end());
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}
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#endif
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#ifndef BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
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template<typename Allocator = std::allocator<charT> >
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std::basic_string<charT, traits, Allocator> to_string(const Allocator& a = Allocator()) const {
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return std::basic_string<charT, traits, Allocator>(begin(), end(), a);
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}
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#else
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std::basic_string<charT, traits> to_string() const {
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return std::basic_string<charT, traits>(begin(), end());
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}
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template<typename Allocator>
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std::basic_string<charT, traits, Allocator> to_string(const Allocator& a) const {
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return std::basic_string<charT, traits, Allocator>(begin(), end(), a);
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}
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#endif
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size_type copy(charT* s, size_type n, size_type pos=0) const {
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if (pos > size())
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BOOST_THROW_EXCEPTION(std::out_of_range("string_view::copy" ));
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size_type rlen = (std::min)(n, len_ - pos);
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// use std::copy(begin() + pos, begin() + pos + rlen, s) rather than
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// std::copy_n(begin() + pos, rlen, s) to support pre-C++11 standard libraries
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std::copy(begin() + pos, begin() + pos + rlen, s);
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return rlen;
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}
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BOOST_CXX14_CONSTEXPR basic_string_view substr(size_type pos, size_type n=npos) const {
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if ( pos > size())
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BOOST_THROW_EXCEPTION( std::out_of_range ( "string_view::substr" ) );
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if (n == npos || pos + n > size())
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n = size () - pos;
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return basic_string_view(data() + pos, n);
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}
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BOOST_CXX14_CONSTEXPR int compare(basic_string_view x) const BOOST_NOEXCEPT {
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const int cmp = traits::compare(ptr_, x.ptr_, (std::min)(len_, x.len_));
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return cmp != 0 ? cmp : (len_ == x.len_ ? 0 : len_ < x.len_ ? -1 : 1);
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}
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BOOST_CXX14_CONSTEXPR int compare(size_type pos1, size_type n1, basic_string_view x)
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const BOOST_NOEXCEPT {
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return substr(pos1, n1).compare(x);
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}
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BOOST_CXX14_CONSTEXPR int compare(size_type pos1, size_type n1,
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basic_string_view x, size_type pos2, size_type n2) const {
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return substr(pos1, n1).compare(x.substr(pos2, n2));
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}
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BOOST_CXX14_CONSTEXPR int compare(const charT* x) const {
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return compare(basic_string_view(x));
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}
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BOOST_CXX14_CONSTEXPR int compare(size_type pos1, size_type n1, const charT* x) const {
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return substr(pos1, n1).compare(basic_string_view(x));
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}
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BOOST_CXX14_CONSTEXPR int compare(size_type pos1, size_type n1,
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const charT* x, size_type n2) const {
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return substr(pos1, n1).compare(basic_string_view(x, n2));
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}
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// Searches
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BOOST_CONSTEXPR bool starts_with(charT c) const BOOST_NOEXCEPT { // Boost extension
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return !empty() && traits::eq(c, front());
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}
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BOOST_CONSTEXPR bool starts_with(basic_string_view x) const BOOST_NOEXCEPT { // Boost extension
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return len_ >= x.len_ && traits::compare(ptr_, x.ptr_, x.len_) == 0;
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}
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BOOST_CONSTEXPR bool ends_with(charT c) const BOOST_NOEXCEPT { // Boost extension
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return !empty() && traits::eq(c, back());
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}
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BOOST_CONSTEXPR bool ends_with(basic_string_view x) const BOOST_NOEXCEPT { // Boost extension
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return len_ >= x.len_ &&
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traits::compare(ptr_ + len_ - x.len_, x.ptr_, x.len_) == 0;
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}
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// find
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BOOST_CXX14_CONSTEXPR size_type find(basic_string_view s, size_type pos = 0) const BOOST_NOEXCEPT {
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if (pos > size())
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return npos;
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if (s.empty())
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return pos;
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const_iterator iter = std::search(this->cbegin() + pos, this->cend(),
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s.cbegin (), s.cend (), traits::eq);
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return iter == this->cend () ? npos : std::distance(this->cbegin (), iter);
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}
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BOOST_CXX14_CONSTEXPR size_type find(charT c, size_type pos = 0) const BOOST_NOEXCEPT
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{ return find(basic_string_view(&c, 1), pos); }
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BOOST_CXX14_CONSTEXPR size_type find(const charT* s, size_type pos, size_type n) const BOOST_NOEXCEPT
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{ return find(basic_string_view(s, n), pos); }
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BOOST_CXX14_CONSTEXPR size_type find(const charT* s, size_type pos = 0) const BOOST_NOEXCEPT
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{ return find(basic_string_view(s), pos); }
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// rfind
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BOOST_CXX14_CONSTEXPR size_type rfind(basic_string_view s, size_type pos = npos) const BOOST_NOEXCEPT {
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if (len_ < s.len_)
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return npos;
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if (pos > len_ - s.len_)
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pos = len_ - s.len_;
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if (s.len_ == 0u) // an empty string is always found
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return pos;
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for (const charT* cur = ptr_ + pos; ; --cur) {
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if (traits::compare(cur, s.ptr_, s.len_) == 0)
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return cur - ptr_;
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if (cur == ptr_)
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return npos;
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};
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}
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BOOST_CXX14_CONSTEXPR size_type rfind(charT c, size_type pos = npos) const BOOST_NOEXCEPT
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{ return rfind(basic_string_view(&c, 1), pos); }
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BOOST_CXX14_CONSTEXPR size_type rfind(const charT* s, size_type pos, size_type n) const BOOST_NOEXCEPT
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{ return rfind(basic_string_view(s, n), pos); }
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BOOST_CXX14_CONSTEXPR size_type rfind(const charT* s, size_type pos = npos) const BOOST_NOEXCEPT
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{ return rfind(basic_string_view(s), pos); }
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// find_first_of
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BOOST_CXX14_CONSTEXPR size_type find_first_of(basic_string_view s, size_type pos = 0) const BOOST_NOEXCEPT {
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if (pos >= len_ || s.len_ == 0)
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return npos;
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const_iterator iter = std::find_first_of
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(this->cbegin () + pos, this->cend (), s.cbegin (), s.cend (), traits::eq);
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return iter == this->cend () ? npos : std::distance ( this->cbegin (), iter );
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}
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BOOST_CXX14_CONSTEXPR size_type find_first_of(charT c, size_type pos = 0) const BOOST_NOEXCEPT
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{ return find_first_of(basic_string_view(&c, 1), pos); }
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BOOST_CXX14_CONSTEXPR size_type find_first_of(const charT* s, size_type pos, size_type n) const BOOST_NOEXCEPT
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{ return find_first_of(basic_string_view(s, n), pos); }
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BOOST_CXX14_CONSTEXPR size_type find_first_of(const charT* s, size_type pos = 0) const BOOST_NOEXCEPT
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{ return find_first_of(basic_string_view(s), pos); }
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// find_last_of
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BOOST_CXX14_CONSTEXPR size_type find_last_of(basic_string_view s, size_type pos = npos) const BOOST_NOEXCEPT {
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if (s.len_ == 0u)
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return npos;
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if (pos >= len_)
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pos = 0;
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else
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pos = len_ - (pos+1);
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const_reverse_iterator iter = std::find_first_of
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( this->crbegin () + pos, this->crend (), s.cbegin (), s.cend (), traits::eq );
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return iter == this->crend () ? npos : reverse_distance ( this->crbegin (), iter);
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}
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BOOST_CXX14_CONSTEXPR size_type find_last_of(charT c, size_type pos = npos) const BOOST_NOEXCEPT
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{ return find_last_of(basic_string_view(&c, 1), pos); }
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BOOST_CXX14_CONSTEXPR size_type find_last_of(const charT* s, size_type pos, size_type n) const BOOST_NOEXCEPT
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{ return find_last_of(basic_string_view(s, n), pos); }
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BOOST_CXX14_CONSTEXPR size_type find_last_of(const charT* s, size_type pos = npos) const BOOST_NOEXCEPT
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{ return find_last_of(basic_string_view(s), pos); }
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// find_first_not_of
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BOOST_CXX14_CONSTEXPR size_type find_first_not_of(basic_string_view s, size_type pos = 0) const BOOST_NOEXCEPT {
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if (pos >= len_)
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return npos;
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if (s.len_ == 0)
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return pos;
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const_iterator iter = find_not_of ( this->cbegin () + pos, this->cend (), s );
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return iter == this->cend () ? npos : std::distance ( this->cbegin (), iter );
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}
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BOOST_CXX14_CONSTEXPR size_type find_first_not_of(charT c, size_type pos = 0) const BOOST_NOEXCEPT
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{ return find_first_not_of(basic_string_view(&c, 1), pos); }
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BOOST_CXX14_CONSTEXPR size_type find_first_not_of(const charT* s, size_type pos, size_type n) const BOOST_NOEXCEPT
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{ return find_first_not_of(basic_string_view(s, n), pos); }
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BOOST_CXX14_CONSTEXPR size_type find_first_not_of(const charT* s, size_type pos = 0) const BOOST_NOEXCEPT
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{ return find_first_not_of(basic_string_view(s), pos); }
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// find_last_not_of
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BOOST_CXX14_CONSTEXPR size_type find_last_not_of(basic_string_view s, size_type pos = npos) const BOOST_NOEXCEPT {
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if (pos >= len_)
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pos = len_ - 1;
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if (s.len_ == 0u)
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return pos;
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pos = len_ - (pos+1);
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const_reverse_iterator iter = find_not_of ( this->crbegin () + pos, this->crend (), s );
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return iter == this->crend () ? npos : reverse_distance ( this->crbegin (), iter );
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}
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BOOST_CXX14_CONSTEXPR size_type find_last_not_of(charT c, size_type pos = npos) const BOOST_NOEXCEPT
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{ return find_last_not_of(basic_string_view(&c, 1), pos); }
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BOOST_CXX14_CONSTEXPR size_type find_last_not_of(const charT* s, size_type pos, size_type n) const BOOST_NOEXCEPT
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{ return find_last_not_of(basic_string_view(s, n), pos); }
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BOOST_CXX14_CONSTEXPR size_type find_last_not_of(const charT* s, size_type pos = npos) const BOOST_NOEXCEPT
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{ return find_last_not_of(basic_string_view(s), pos); }
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private:
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template <typename r_iter>
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size_type reverse_distance(r_iter first, r_iter last) const BOOST_NOEXCEPT {
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// Portability note here: std::distance is not NOEXCEPT, but calling it with a string_view::reverse_iterator will not throw.
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return len_ - 1 - std::distance ( first, last );
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}
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template <typename Iterator>
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Iterator find_not_of(Iterator first, Iterator last, basic_string_view s) const BOOST_NOEXCEPT {
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for (; first != last ; ++first)
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if ( 0 == traits::find(s.ptr_, s.len_, *first))
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return first;
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return last;
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}
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const charT *ptr_;
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std::size_t len_;
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};
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// Comparison operators
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// Equality
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template<typename charT, typename traits>
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inline bool operator==(basic_string_view<charT, traits> x,
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basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
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if (x.size () != y.size ()) return false;
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return x.compare(y) == 0;
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}
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// Inequality
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template<typename charT, typename traits>
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inline bool operator!=(basic_string_view<charT, traits> x,
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basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
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if ( x.size () != y.size ()) return true;
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return x.compare(y) != 0;
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}
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// Less than
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template<typename charT, typename traits>
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inline bool operator<(basic_string_view<charT, traits> x,
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basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
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return x.compare(y) < 0;
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}
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// Greater than
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template<typename charT, typename traits>
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inline bool operator>(basic_string_view<charT, traits> x,
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basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
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return x.compare(y) > 0;
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}
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// Less than or equal to
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template<typename charT, typename traits>
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inline bool operator<=(basic_string_view<charT, traits> x,
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basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
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return x.compare(y) <= 0;
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}
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// Greater than or equal to
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template<typename charT, typename traits>
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inline bool operator>=(basic_string_view<charT, traits> x,
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basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
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return x.compare(y) >= 0;
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}
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// "sufficient additional overloads of comparison functions"
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template<typename charT, typename traits, typename Allocator>
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inline bool operator==(basic_string_view<charT, traits> x,
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const std::basic_string<charT, traits, Allocator> & y) BOOST_NOEXCEPT {
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return x == basic_string_view<charT, traits>(y);
|
|
}
|
|
|
|
template<typename charT, typename traits, typename Allocator>
|
|
inline bool operator==(const std::basic_string<charT, traits, Allocator> & x,
|
|
basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
|
|
return basic_string_view<charT, traits>(x) == y;
|
|
}
|
|
|
|
template<typename charT, typename traits>
|
|
inline bool operator==(basic_string_view<charT, traits> x,
|
|
const charT * y) BOOST_NOEXCEPT {
|
|
return x == basic_string_view<charT, traits>(y);
|
|
}
|
|
|
|
template<typename charT, typename traits>
|
|
inline bool operator==(const charT * x,
|
|
basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
|
|
return basic_string_view<charT, traits>(x) == y;
|
|
}
|
|
|
|
template<typename charT, typename traits, typename Allocator>
|
|
inline bool operator!=(basic_string_view<charT, traits> x,
|
|
const std::basic_string<charT, traits, Allocator> & y) BOOST_NOEXCEPT {
|
|
return x != basic_string_view<charT, traits>(y);
|
|
}
|
|
|
|
template<typename charT, typename traits, typename Allocator>
|
|
inline bool operator!=(const std::basic_string<charT, traits, Allocator> & x,
|
|
basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
|
|
return basic_string_view<charT, traits>(x) != y;
|
|
}
|
|
|
|
template<typename charT, typename traits>
|
|
inline bool operator!=(basic_string_view<charT, traits> x,
|
|
const charT * y) BOOST_NOEXCEPT {
|
|
return x != basic_string_view<charT, traits>(y);
|
|
}
|
|
|
|
template<typename charT, typename traits>
|
|
inline bool operator!=(const charT * x,
|
|
basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
|
|
return basic_string_view<charT, traits>(x) != y;
|
|
}
|
|
|
|
template<typename charT, typename traits, typename Allocator>
|
|
inline bool operator<(basic_string_view<charT, traits> x,
|
|
const std::basic_string<charT, traits, Allocator> & y) BOOST_NOEXCEPT {
|
|
return x < basic_string_view<charT, traits>(y);
|
|
}
|
|
|
|
template<typename charT, typename traits, typename Allocator>
|
|
inline bool operator<(const std::basic_string<charT, traits, Allocator> & x,
|
|
basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
|
|
return basic_string_view<charT, traits>(x) < y;
|
|
}
|
|
|
|
template<typename charT, typename traits>
|
|
inline bool operator<(basic_string_view<charT, traits> x,
|
|
const charT * y) BOOST_NOEXCEPT {
|
|
return x < basic_string_view<charT, traits>(y);
|
|
}
|
|
|
|
template<typename charT, typename traits>
|
|
inline bool operator<(const charT * x,
|
|
basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
|
|
return basic_string_view<charT, traits>(x) < y;
|
|
}
|
|
|
|
template<typename charT, typename traits, typename Allocator>
|
|
inline bool operator>(basic_string_view<charT, traits> x,
|
|
const std::basic_string<charT, traits, Allocator> & y) BOOST_NOEXCEPT {
|
|
return x > basic_string_view<charT, traits>(y);
|
|
}
|
|
|
|
template<typename charT, typename traits, typename Allocator>
|
|
inline bool operator>(const std::basic_string<charT, traits, Allocator> & x,
|
|
basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
|
|
return basic_string_view<charT, traits>(x) > y;
|
|
}
|
|
|
|
template<typename charT, typename traits>
|
|
inline bool operator>(basic_string_view<charT, traits> x,
|
|
const charT * y) BOOST_NOEXCEPT {
|
|
return x > basic_string_view<charT, traits>(y);
|
|
}
|
|
|
|
template<typename charT, typename traits>
|
|
inline bool operator>(const charT * x,
|
|
basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
|
|
return basic_string_view<charT, traits>(x) > y;
|
|
}
|
|
|
|
template<typename charT, typename traits, typename Allocator>
|
|
inline bool operator<=(basic_string_view<charT, traits> x,
|
|
const std::basic_string<charT, traits, Allocator> & y) BOOST_NOEXCEPT {
|
|
return x <= basic_string_view<charT, traits>(y);
|
|
}
|
|
|
|
template<typename charT, typename traits, typename Allocator>
|
|
inline bool operator<=(const std::basic_string<charT, traits, Allocator> & x,
|
|
basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
|
|
return basic_string_view<charT, traits>(x) <= y;
|
|
}
|
|
|
|
template<typename charT, typename traits>
|
|
inline bool operator<=(basic_string_view<charT, traits> x,
|
|
const charT * y) BOOST_NOEXCEPT {
|
|
return x <= basic_string_view<charT, traits>(y);
|
|
}
|
|
|
|
template<typename charT, typename traits>
|
|
inline bool operator<=(const charT * x,
|
|
basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
|
|
return basic_string_view<charT, traits>(x) <= y;
|
|
}
|
|
|
|
template<typename charT, typename traits, typename Allocator>
|
|
inline bool operator>=(basic_string_view<charT, traits> x,
|
|
const std::basic_string<charT, traits, Allocator> & y) BOOST_NOEXCEPT {
|
|
return x >= basic_string_view<charT, traits>(y);
|
|
}
|
|
|
|
template<typename charT, typename traits, typename Allocator>
|
|
inline bool operator>=(const std::basic_string<charT, traits, Allocator> & x,
|
|
basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
|
|
return basic_string_view<charT, traits>(x) >= y;
|
|
}
|
|
|
|
template<typename charT, typename traits>
|
|
inline bool operator>=(basic_string_view<charT, traits> x,
|
|
const charT * y) BOOST_NOEXCEPT {
|
|
return x >= basic_string_view<charT, traits>(y);
|
|
}
|
|
|
|
template<typename charT, typename traits>
|
|
inline bool operator>=(const charT * x,
|
|
basic_string_view<charT, traits> y) BOOST_NOEXCEPT {
|
|
return basic_string_view<charT, traits>(x) >= y;
|
|
}
|
|
|
|
namespace detail {
|
|
|
|
template<class charT, class traits>
|
|
inline void sv_insert_fill_chars(std::basic_ostream<charT, traits>& os, std::size_t n) {
|
|
enum { chunk_size = 8 };
|
|
charT fill_chars[chunk_size];
|
|
std::fill_n(fill_chars, static_cast< std::size_t >(chunk_size), os.fill());
|
|
for (; n >= chunk_size && os.good(); n -= chunk_size)
|
|
os.write(fill_chars, static_cast< std::size_t >(chunk_size));
|
|
if (n > 0 && os.good())
|
|
os.write(fill_chars, n);
|
|
}
|
|
|
|
template<class charT, class traits>
|
|
void sv_insert_aligned(std::basic_ostream<charT, traits>& os, const basic_string_view<charT,traits>& str) {
|
|
const std::size_t size = str.size();
|
|
const std::size_t alignment_size = static_cast< std::size_t >(os.width()) - size;
|
|
const bool align_left = (os.flags() & std::basic_ostream<charT, traits>::adjustfield) == std::basic_ostream<charT, traits>::left;
|
|
if (!align_left) {
|
|
detail::sv_insert_fill_chars(os, alignment_size);
|
|
if (os.good())
|
|
os.write(str.data(), size);
|
|
}
|
|
else {
|
|
os.write(str.data(), size);
|
|
if (os.good())
|
|
detail::sv_insert_fill_chars(os, alignment_size);
|
|
}
|
|
}
|
|
|
|
} // namespace detail
|
|
|
|
// Inserter
|
|
template<class charT, class traits>
|
|
inline std::basic_ostream<charT, traits>&
|
|
operator<<(std::basic_ostream<charT, traits>& os,
|
|
const basic_string_view<charT,traits>& str) {
|
|
if (os.good()) {
|
|
const std::size_t size = str.size();
|
|
const std::size_t w = static_cast< std::size_t >(os.width());
|
|
if (w <= size)
|
|
os.write(str.data(), size);
|
|
else
|
|
detail::sv_insert_aligned(os, str);
|
|
os.width(0);
|
|
}
|
|
return os;
|
|
}
|
|
|
|
#if 0
|
|
// numeric conversions
|
|
//
|
|
// These are short-term implementations.
|
|
// In a production environment, I would rather avoid the copying.
|
|
//
|
|
inline int stoi (string_view str, size_t* idx=0, int base=10) {
|
|
return std::stoi ( std::string(str), idx, base );
|
|
}
|
|
|
|
inline long stol (string_view str, size_t* idx=0, int base=10) {
|
|
return std::stol ( std::string(str), idx, base );
|
|
}
|
|
|
|
inline unsigned long stoul (string_view str, size_t* idx=0, int base=10) {
|
|
return std::stoul ( std::string(str), idx, base );
|
|
}
|
|
|
|
inline long long stoll (string_view str, size_t* idx=0, int base=10) {
|
|
return std::stoll ( std::string(str), idx, base );
|
|
}
|
|
|
|
inline unsigned long long stoull (string_view str, size_t* idx=0, int base=10) {
|
|
return std::stoull ( std::string(str), idx, base );
|
|
}
|
|
|
|
inline float stof (string_view str, size_t* idx=0) {
|
|
return std::stof ( std::string(str), idx );
|
|
}
|
|
|
|
inline double stod (string_view str, size_t* idx=0) {
|
|
return std::stod ( std::string(str), idx );
|
|
}
|
|
|
|
inline long double stold (string_view str, size_t* idx=0) {
|
|
return std::stold ( std::string(str), idx );
|
|
}
|
|
|
|
inline int stoi (wstring_view str, size_t* idx=0, int base=10) {
|
|
return std::stoi ( std::wstring(str), idx, base );
|
|
}
|
|
|
|
inline long stol (wstring_view str, size_t* idx=0, int base=10) {
|
|
return std::stol ( std::wstring(str), idx, base );
|
|
}
|
|
|
|
inline unsigned long stoul (wstring_view str, size_t* idx=0, int base=10) {
|
|
return std::stoul ( std::wstring(str), idx, base );
|
|
}
|
|
|
|
inline long long stoll (wstring_view str, size_t* idx=0, int base=10) {
|
|
return std::stoll ( std::wstring(str), idx, base );
|
|
}
|
|
|
|
inline unsigned long long stoull (wstring_view str, size_t* idx=0, int base=10) {
|
|
return std::stoull ( std::wstring(str), idx, base );
|
|
}
|
|
|
|
inline float stof (wstring_view str, size_t* idx=0) {
|
|
return std::stof ( std::wstring(str), idx );
|
|
}
|
|
|
|
inline double stod (wstring_view str, size_t* idx=0) {
|
|
return std::stod ( std::wstring(str), idx );
|
|
}
|
|
|
|
inline long double stold (wstring_view str, size_t* idx=0) {
|
|
return std::stold ( std::wstring(str), idx );
|
|
}
|
|
#endif
|
|
|
|
}
|
|
|
|
#if 0
|
|
namespace std {
|
|
// Hashing
|
|
template<> struct hash<boost::string_view>;
|
|
template<> struct hash<boost::u16string_view>;
|
|
template<> struct hash<boost::u32string_view>;
|
|
template<> struct hash<boost::wstring_view>;
|
|
}
|
|
#endif
|
|
|
|
#endif
|