← Back
Editing: string_view.hpp
/* Copyright (c) Marshall Clow 2012-2015. Copyright (c) Beman Dawes 2015 Copyright (c) Glen Joseph Fernandes 2019 (glenjofe@gmail.com) Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) For more information, see http://www.boost.org Based on the StringRef implementation in LLVM (http://llvm.org) and N3422 by Jeffrey Yasskin http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3442.html Updated July 2015 to reflect the Library Fundamentals TS http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4480.html */ #ifndef BOOST_STRING_VIEW_HPP #define BOOST_STRING_VIEW_HPP #include <boost/config.hpp> #include <boost/detail/workaround.hpp> #include <boost/io/ostream_put.hpp> #include <boost/utility/string_view_fwd.hpp> #include <boost/throw_exception.hpp> #include <boost/container_hash/hash_fwd.hpp> #include <cstddef> #include <stdexcept> #include <algorithm> #include <iterator> #include <string> #include <cstring> #include <iosfwd> #if defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) || (defined(BOOST_GCC) && ((BOOST_GCC+0) / 100) <= 406) // GCC 4.6 cannot handle a defaulted function with noexcept specifier #define BOOST_STRING_VIEW_NO_CXX11_DEFAULTED_NOEXCEPT_FUNCTIONS #endif namespace boost { namespace detail { // A helper functor because sometimes we don't have lambdas template <typename charT, typename traits> class string_view_traits_eq { public: string_view_traits_eq ( charT ch ) : ch_(ch) {} bool operator()( charT val ) const { return traits::eq (ch_, val); } charT ch_; }; } template<typename charT, typename traits> // traits defaulted in string_view_fwd.hpp class basic_string_view { public: // types typedef traits traits_type; typedef charT value_type; typedef charT* pointer; typedef const charT* const_pointer; typedef charT& reference; typedef const charT& const_reference; typedef const_pointer const_iterator; // impl-defined typedef const_iterator iterator; typedef std::reverse_iterator<const_iterator> const_reverse_iterator; typedef const_reverse_iterator reverse_iterator; typedef std::size_t size_type; typedef std::ptrdiff_t difference_type; static BOOST_CONSTEXPR_OR_CONST size_type npos = size_type(-1); // construct/copy BOOST_CONSTEXPR basic_string_view() BOOST_NOEXCEPT : ptr_(NULL), len_(0) {} // by defaulting these functions, basic_string_ref becomes // trivially copy/move constructible. BOOST_CONSTEXPR basic_string_view(const basic_string_view &rhs) BOOST_NOEXCEPT #ifndef BOOST_STRING_VIEW_NO_CXX11_DEFAULTED_NOEXCEPT_FUNCTIONS = default; #else : ptr_(rhs.ptr_), len_(rhs.len_) {} #endif basic_string_view& operator=(const basic_string_view &rhs) BOOST_NOEXCEPT #ifndef BOOST_STRING_VIEW_NO_CXX11_DEFAULTED_NOEXCEPT_FUNCTIONS = default; #else { ptr_ = rhs.ptr_; len_ = rhs.len_; return *this; } #endif template<typename Allocator> basic_string_view(const std::basic_string<charT, traits, Allocator>& str) BOOST_NOEXCEPT : ptr_(str.data()), len_(str.length()) {} // #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && !defined(BOOST_NO_CXX11_DELETED_FUNCTIONS) // // Constructing a string_view from a temporary string is a bad idea // template<typename Allocator> // basic_string_view( std::basic_string<charT, traits, Allocator>&&) // = delete; // #endif BOOST_CONSTEXPR basic_string_view(const charT* str) : ptr_(str), len_(traits::length(str)) {} BOOST_CONSTEXPR basic_string_view(const charT* str, size_type len) : ptr_(str), len_(len) {} // iterators BOOST_CONSTEXPR const_iterator begin() const BOOST_NOEXCEPT { return ptr_; } BOOST_CONSTEXPR const_iterator cbegin() const BOOST_NOEXCEPT { return ptr_; } BOOST_CONSTEXPR const_iterator end() const BOOST_NOEXCEPT { return ptr_ + len_; } BOOST_CONSTEXPR const_iterator cend() const BOOST_NOEXCEPT { return ptr_ + len_; } const_reverse_iterator rbegin() const BOOST_NOEXCEPT { return const_reverse_iterator(end()); } const_reverse_iterator crbegin() const BOOST_NOEXCEPT { return const_reverse_iterator(end()); } const_reverse_iterator rend() const BOOST_NOEXCEPT { return const_reverse_iterator(begin()); } const_reverse_iterator crend() const BOOST_NOEXCEPT { return const_reverse_iterator(begin()); } // capacity BOOST_CONSTEXPR size_type size() const BOOST_NOEXCEPT { return len_; } BOOST_CONSTEXPR size_type length() const BOOST_NOEXCEPT { return len_; } BOOST_CONSTEXPR size_type max_size() const BOOST_NOEXCEPT { return len_; } BOOST_CONSTEXPR bool empty() const BOOST_NOEXCEPT { return len_ == 0; } // element access BOOST_CONSTEXPR const_reference operator[](size_type pos) const BOOST_NOEXCEPT { return ptr_[pos]; } BOOST_CONSTEXPR const_reference at(size_t pos) const { return pos >= len_ ? BOOST_THROW_EXCEPTION(std::out_of_range("boost::string_view::at")), ptr_[0] : ptr_[pos]; } BOOST_CONSTEXPR const_reference front() const { return ptr_[0]; } BOOST_CONSTEXPR const_reference back() const { return ptr_[len_-1]; } BOOST_CONSTEXPR const_pointer data() const BOOST_NOEXCEPT { return ptr_; } // modifiers void clear() BOOST_NOEXCEPT { len_ = 0; } // Boost extension BOOST_CXX14_CONSTEXPR void remove_prefix(size_type n) { if ( n > len_ ) n = len_; ptr_ += n; len_ -= n; } BOOST_CXX14_CONSTEXPR void remove_suffix(size_type n) { if ( n > len_ ) n = len_; len_ -= n; } BOOST_CXX14_CONSTEXPR void swap(basic_string_view& s) BOOST_NOEXCEPT { std::swap(ptr_, s.ptr_); std::swap(len_, s.len_); } // basic_string_view string operations #ifndef BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS template<typename Allocator> explicit operator std::basic_string<charT, traits, Allocator>() const { return std::basic_string<charT, traits, Allocator>(begin(), end()); } #endif #ifndef BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS template<typename Allocator = std::allocator<charT> > std::basic_string<charT, traits, Allocator> to_string(const Allocator& a = Allocator()) const { return std::basic_string<charT, traits, Allocator>(begin(), end(), a); } #else std::basic_string<charT, traits> to_string() const { return std::basic_string<charT, traits>(begin(), end()); } template<typename Allocator> std::basic_string<charT, traits, Allocator> to_string(const Allocator& a) const { return std::basic_string<charT, traits, Allocator>(begin(), end(), a); } #endif size_type copy(charT* s, size_type n, size_type pos=0) const { if (pos > size()) BOOST_THROW_EXCEPTION(std::out_of_range("string_view::copy" )); size_type rlen = (std::min)(n, len_ - pos); traits_type::copy(s, data() + pos, rlen); return rlen; } BOOST_CXX14_CONSTEXPR basic_string_view substr(size_type pos, size_type n=npos) const { if ( pos > size()) BOOST_THROW_EXCEPTION( std::out_of_range ( "string_view::substr" ) ); return basic_string_view(data() + pos, (std::min)(size() - pos, n)); } BOOST_CXX14_CONSTEXPR int compare(basic_string_view x) const BOOST_NOEXCEPT { const int cmp = traits::compare(ptr_, x.ptr_, (std::min)(len_, x.len_)); return cmp != 0 ? cmp : (len_ == x.len_ ? 0 : len_ < x.len_ ? -1 : 1); } BOOST_CXX14_CONSTEXPR int compare(size_type pos1, size_type n1, basic_string_view x) const BOOST_NOEXCEPT { return substr(pos1, n1).compare(x); } BOOST_CXX14_CONSTEXPR int compare(size_type pos1, size_type n1, basic_string_view x, size_type pos2, size_type n2) const { return substr(pos1, n1).compare(x.substr(pos2, n2)); } BOOST_CXX14_CONSTEXPR int compare(const charT* x) const { return compare(basic_string_view(x)); } BOOST_CXX14_CONSTEXPR int compare(size_type pos1, size_type n1, const charT* x) const { return substr(pos1, n1).compare(basic_string_view(x)); } BOOST_CXX14_CONSTEXPR int compare(size_type pos1, size_type n1, const charT* x, size_type n2) const { return substr(pos1, n1).compare(basic_string_view(x, n2)); } // Searches BOOST_CONSTEXPR bool starts_with(charT c) const BOOST_NOEXCEPT { // Boost extension return !empty() && traits::eq(c, front()); } BOOST_CONSTEXPR bool starts_with(basic_string_view x) const BOOST_NOEXCEPT { // Boost extension return len_ >= x.len_ && traits::compare(ptr_, x.ptr_, x.len_) == 0; } BOOST_CONSTEXPR bool ends_with(charT c) const BOOST_NOEXCEPT { // Boost extension return !empty() && traits::eq(c, back()); } BOOST_CONSTEXPR bool ends_with(basic_string_view x) const BOOST_NOEXCEPT { // Boost extension return len_ >= x.len_ && traits::compare(ptr_ + len_ - x.len_, x.ptr_, x.len_) == 0; } // find BOOST_CXX14_CONSTEXPR size_type find(basic_string_view s, size_type pos = 0) const BOOST_NOEXCEPT { if (pos > size()) return npos; if (s.empty()) return pos; if (s.size() > size() - pos) return npos; const charT* cur = ptr_ + pos; const charT* last = cend() - s.size() + 1; for (; cur != last ; ++cur) { cur = traits::find(cur, last - cur, s[0]); if (!cur) return npos; if (traits::compare(cur, s.cbegin(), s.size()) == 0) return cur - ptr_; } return npos; } BOOST_CXX14_CONSTEXPR size_type find(charT c, size_type pos = 0) const BOOST_NOEXCEPT { if (pos > size()) return npos; const charT* ret_ptr = traits::find(ptr_ + pos, len_ - pos, c); if (ret_ptr) return ret_ptr - ptr_; return npos; } BOOST_CXX14_CONSTEXPR size_type find(const charT* s, size_type pos, size_type n) const BOOST_NOEXCEPT { return find(basic_string_view(s, n), pos); } BOOST_CXX14_CONSTEXPR size_type find(const charT* s, size_type pos = 0) const BOOST_NOEXCEPT { return find(basic_string_view(s), pos); } // rfind BOOST_CXX14_CONSTEXPR size_type rfind(basic_string_view s, size_type pos = npos) const BOOST_NOEXCEPT { if (len_ < s.len_) return npos; if (pos > len_ - s.len_) pos = len_ - s.len_; if (s.len_ == 0u) // an empty string is always found return pos; for (const charT* cur = ptr_ + pos; ; --cur) { if (traits::compare(cur, s.ptr_, s.len_) == 0) return cur - ptr_; if (cur == ptr_) return npos; }; } BOOST_CXX14_CONSTEXPR size_type rfind(charT c, size_type pos = npos) const BOOST_NOEXCEPT { return rfind(basic_string_view(&c, 1), pos); } BOOST_CXX14_CONSTEXPR size_type rfind(const charT* s, size_type pos, size_type n) const BOOST_NOEXCEPT { return rfind(basic_string_view(s, n), pos); } BOOST_CXX14_CONSTEXPR size_type rfind(const charT* s, size_type pos = npos) const BOOST_NOEXCEPT { return rfind(basic_string_view(s), pos); } // find_first_of BOOST_CXX14_CONSTEXPR size_type find_first_of(basic_string_view s, size_type pos = 0) const BOOST_NOEXCEPT { if (pos >= len_ || s.len_ == 0) return npos; const_iterator iter = std::find_first_of (this->cbegin () + pos, this->cend (), s.cbegin (), s.cend (), traits::eq); return iter == this->cend () ? npos : std::distance ( this->cbegin (), iter ); } BOOST_CXX14_CONSTEXPR size_type find_first_of(charT c, size_type pos = 0) const BOOST_NOEXCEPT { return find(c, pos); } BOOST_CXX14_CONSTEXPR size_type find_first_of(const charT* s, size_type pos, size_type n) const BOOST_NOEXCEPT { return find_first_of(basic_string_view(s, n), pos); } BOOST_CXX14_CONSTEXPR size_type find_first_of(const charT* s, size_type pos = 0) const BOOST_NOEXCEPT { return find_first_of(basic_string_view(s), pos); } // find_last_of BOOST_CXX14_CONSTEXPR size_type find_last_of(basic_string_view s, size_type pos = npos) const BOOST_NOEXCEPT { if (s.len_ == 0u) return npos; if (pos >= len_) pos = 0; else pos = len_ - (pos+1); const_reverse_iterator iter = std::find_first_of ( this->crbegin () + pos, this->crend (), s.cbegin (), s.cend (), traits::eq ); return iter == this->crend () ? npos : reverse_distance ( this->crbegin (), iter); } BOOST_CXX14_CONSTEXPR size_type find_last_of(charT c, size_type pos = npos) const BOOST_NOEXCEPT { return find_last_of(basic_string_view(&c, 1), pos); } BOOST_CXX14_CONSTEXPR size_type find_last_of(const charT* s, size_type pos, size_type n) const BOOST_NOEXCEPT { return find_last_of(basic_string_view(s, n), pos); } BOOST_CXX14_CONSTEXPR size_type find_last_of(const charT* s, size_type pos = npos) const BOOST_NOEXCEPT { return find_last_of(basic_string_view(s), pos); } // find_first_not_of BOOST_CXX14_CONSTEXPR size_type find_first_not_of(basic_string_view s, size_type pos = 0) const BOOST_NOEXCEPT { if (pos >= len_) return npos; if (s.len_ == 0) return pos; const_iterator iter = find_not_of ( this->cbegin () + pos, this->cend (), s ); return iter == this->cend () ? npos : std::distance ( this->cbegin (), iter ); } BOOST_CXX14_CONSTEXPR size_type find_first_not_of(charT c, size_type pos = 0) const BOOST_NOEXCEPT { return find_first_not_of(basic_string_view(&c, 1), pos); } BOOST_CXX14_CONSTEXPR size_type find_first_not_of(const charT* s, size_type pos, size_type n) const BOOST_NOEXCEPT { return find_first_not_of(basic_string_view(s, n), pos); } BOOST_CXX14_CONSTEXPR size_type find_first_not_of(const charT* s, size_type pos = 0) const BOOST_NOEXCEPT { return find_first_not_of(basic_string_view(s), pos); } // find_last_not_of BOOST_CXX14_CONSTEXPR size_type find_last_not_of(basic_string_view s, size_type pos = npos) const BOOST_NOEXCEPT { if (pos >= len_) pos = len_ - 1; if (s.len_ == 0u) return pos; pos = len_ - (pos+1); const_reverse_iterator iter = find_not_of ( this->crbegin () + pos, this->crend (), s ); return iter == this->crend () ? npos : reverse_distance ( this->crbegin (), iter ); } BOOST_CXX14_CONSTEXPR size_type find_last_not_of(charT c, size_type pos = npos) const BOOST_NOEXCEPT { return find_last_not_of(basic_string_view(&c, 1), pos); } BOOST_CXX14_CONSTEXPR size_type find_last_not_of(const charT* s, size_type pos, size_type n) const BOOST_NOEXCEPT { return find_last_not_of(basic_string_view(s, n), pos); } BOOST_CXX14_CONSTEXPR size_type find_last_not_of(const charT* s, size_type pos = npos) const BOOST_NOEXCEPT { return find_last_not_of(basic_string_view(s), pos); } private: template <typename r_iter> size_type reverse_distance(r_iter first, r_iter last) const BOOST_NOEXCEPT { // Portability note here: std::distance is not NOEXCEPT, but calling it with a string_view::reverse_iterator will not throw. return len_ - 1 - std::distance ( first, last ); } template <typename Iterator> Iterator find_not_of(Iterator first, Iterator last, basic_string_view s) const BOOST_NOEXCEPT { for (; first != last ; ++first) if ( 0 == traits::find(s.ptr_, s.len_, *first)) return first; return last; } const charT *ptr_; std::size_t len_; }; // Comparison operators // Equality template<typename charT, typename traits> inline BOOST_CXX14_CONSTEXPR bool operator==(basic_string_view<charT, traits> x, basic_string_view<charT, traits> y) BOOST_NOEXCEPT { if (x.size () != y.size ()) return false; return x.compare(y) == 0; } // Inequality template<typename charT, typename traits> inline BOOST_CXX14_CONSTEXPR bool operator!=(basic_string_view<charT, traits> x, basic_string_view<charT, traits> y) BOOST_NOEXCEPT { if ( x.size () != y.size ()) return true; return x.compare(y) != 0; } // Less than template<typename charT, typename traits> inline BOOST_CXX14_CONSTEXPR bool operator<(basic_string_view<charT, traits> x, basic_string_view<charT, traits> y) BOOST_NOEXCEPT { return x.compare(y) < 0; } // Greater than template<typename charT, typename traits> inline BOOST_CXX14_CONSTEXPR bool operator>(basic_string_view<charT, traits> x, basic_string_view<charT, traits> y) BOOST_NOEXCEPT { return x.compare(y) > 0; } // Less than or equal to template<typename charT, typename traits> inline BOOST_CXX14_CONSTEXPR bool operator<=(basic_string_view<charT, traits> x, basic_string_view<charT, traits> y) BOOST_NOEXCEPT { return x.compare(y) <= 0; } // Greater than or equal to template<typename charT, typename traits> inline BOOST_CXX14_CONSTEXPR bool operator>=(basic_string_view<charT, traits> x, basic_string_view<charT, traits> y) BOOST_NOEXCEPT { return x.compare(y) >= 0; } // "sufficient additional overloads of comparison functions" template<typename charT, typename traits, typename Allocator> inline BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR 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 BOOST_CXX14_CONSTEXPR bool operator>=(const charT * x, basic_string_view<charT, traits> y) BOOST_NOEXCEPT { return basic_string_view<charT, traits>(x) >= y; } // 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) { return boost::io::ostream_put(os, str.data(), str.size()); } #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 template <class charT, class traits> std::size_t hash_value(basic_string_view<charT, traits> s) { return boost::hash_range(s.begin(), s.end()); } } #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
Save File
Cancel