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 #ifndef BOOST_CORE_STRING_VIEW_HPP_INCLUDED
 #define BOOST_CORE_STRING_VIEW_HPP_INCLUDED
 
 // MS compatible compilers support #pragma once
 
 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
 # pragma once
 #endif
 
 // boost::core::basic_string_view<Ch>
 //
 // Copyright 2021 Peter Dimov
 // Distributed under the Boost Software License, Version 1.0.
 // https://www.boost.org/LICENSE_1_0.txt
 
 #include <boost/core/enable_if.hpp>
 #include <boost/core/detail/is_same.hpp>
 #include <boost/assert.hpp>
 #include <boost/assert/source_location.hpp>
 #include <boost/throw_exception.hpp>
 #include <boost/config.hpp>
 #include <string>
 #include <algorithm>
 #include <utility>
 #include <stdexcept>
 #include <cstddef>
 #include <cstring>
 #include <climits>
 #include <iosfwd>
 #include <ios>
 #if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
 # include <string_view>
 #endif
 #if !defined(BOOST_NO_CXX20_HDR_CONCEPTS) // std::common_reference_with
 # include <type_traits>
 #endif
 
 namespace boost
 {
 
 // forward declaration of boost::basic_string_view from Utility
 template<class Ch, class Tr> class basic_string_view;
 
 namespace core
 {
 namespace detail
 {
 
 template<class Ch> struct sv_to_uchar
 {
     typedef Ch type;
 };
 
 template<> struct sv_to_uchar<char>
 {
     typedef unsigned char type;
 };
 
 #if defined(__GNUC__) && __GNUC__ * 100 + __GNUC_MINOR__ >= 406
 # pragma GCC diagnostic push
 # pragma GCC diagnostic ignored "-Wtype-limits"
 #endif
 
 template<class Ch> BOOST_CXX14_CONSTEXPR std::size_t find_first_of( Ch const* p_, std::size_t n_, Ch const* s, std::size_t pos, std::size_t n ) BOOST_NOEXCEPT
 {
     typedef typename sv_to_uchar<Ch>::type UCh;
 
     unsigned char table[ 256 ] = {};
 
     bool use_table = true;
 
     for( std::size_t j = 0; j < n; ++j )
     {
         UCh ch = static_cast<UCh>( s[ j ] );
 
         if( ch >= 0 && ch < 256 )
         {
             table[ ch ] = 1;
         }
         else
         {
             use_table = false;
             break;
         }
     }
 
     if( use_table )
     {
         for( std::size_t i = pos; i < n_; ++i )
         {
             UCh ch = static_cast<UCh>( p_[ i ] );
             if( ch >= 0 && ch < 256 && table[ ch ] ) return i;
         }
     }
     else if( n >= 16 )
     {
         for( std::size_t i = pos; i < n_; ++i )
         {
             Ch ch = p_[ i ];
             if( std::char_traits<Ch>::find( s, n, ch ) != 0 ) return i;
         }
     }
     else
     {
         for( std::size_t i = pos; i < n_; ++i )
         {
             Ch ch = p_[ i ];
 
             for( std::size_t j = 0; j < n; ++j )
             {
                 if( s[ j ] == ch ) return i;
             }
         }
     }
 
     return static_cast<std::size_t>( -1 );
 }
 
 template<class Ch> BOOST_CXX14_CONSTEXPR std::size_t find_last_of( Ch const* p_, Ch const* s, std::size_t pos, std::size_t n ) BOOST_NOEXCEPT
 {
     typedef typename sv_to_uchar<Ch>::type UCh;
 
     unsigned char table[ 256 ] = {};
 
     bool use_table = true;
 
     for( std::size_t j = 0; j < n; ++j )
     {
         UCh ch = static_cast<UCh>( s[ j ] );
 
         if( ch >= 0 && ch < 256 )
         {
             table[ ch ] = 1;
         }
         else
         {
             use_table = false;
             break;
         }
     }
 
     std::size_t const npos = static_cast< std::size_t >( -1 );
 
     std::size_t i = pos;
 
     if( use_table )
     {
         do
         {
             UCh ch = static_cast<UCh>( p_[ i ] );
 
             if( ch >= 0 && ch < 256 && table[ ch ] ) return i;
 
             --i;
         }
         while( i != npos );
     }
     else if( n >= 16 )
     {
         do
         {
             Ch ch = p_[ i ];
 
             if( std::char_traits<Ch>::find( s, n, ch ) != 0 ) return i;
 
             --i;
         }
         while( i != npos );
     }
     else
     {
         do
         {
             Ch ch = p_[ i ];
 
             for( std::size_t j = 0; j < n; ++j )
             {
                 if( s[ j ] == ch ) return i;
             }
 
             --i;
         }
         while( i != npos );
     }
 
     return npos;
 }
 
 template<class Ch> BOOST_CXX14_CONSTEXPR std::size_t find_first_not_of( Ch const* p_, std::size_t n_, Ch const* s, std::size_t pos, std::size_t n ) BOOST_NOEXCEPT
 {
     typedef typename sv_to_uchar<Ch>::type UCh;
 
     unsigned char table[ 256 ] = {};
 
     bool use_table = true;
 
     for( std::size_t j = 0; j < n; ++j )
     {
         UCh ch = static_cast<UCh>( s[ j ] );
 
         if( ch >= 0 && ch < 256 )
         {
             table[ ch ] = 1;
         }
         else
         {
             use_table = false;
             break;
         }
     }
 
     if( use_table )
     {
         for( std::size_t i = pos; i < n_; ++i )
         {
             UCh ch = static_cast<UCh>( p_[ i ] );
             if( !( ch >= 0 && ch < 256 && table[ ch ] ) ) return i;
         }
     }
     else if( n >= 16 )
     {
         for( std::size_t i = pos; i < n_; ++i )
         {
             Ch ch = p_[ i ];
             if( std::char_traits<Ch>::find( s, n, ch ) == 0 ) return i;
         }
     }
     else
     {
         for( std::size_t i = pos; i < n_; ++i )
         {
             Ch ch = p_[ i ];
 
             bool r = false;
 
             for( std::size_t j = 0; j < n; ++j )
             {
                 if( s[ j ] == ch )
                 {
                     r = true;
                     break;
                 }
             }
 
             if( !r ) return i;
         }
     }
 
     return static_cast<std::size_t>( -1 );
 }
 
 template<class Ch> BOOST_CXX14_CONSTEXPR std::size_t find_last_not_of( Ch const* p_, Ch const* s, std::size_t pos, std::size_t n ) BOOST_NOEXCEPT
 {
     typedef typename sv_to_uchar<Ch>::type UCh;
 
     unsigned char table[ 256 ] = {};
 
     bool use_table = true;
 
     for( std::size_t j = 0; j < n; ++j )
     {
         UCh ch = static_cast<UCh>( s[ j ] );
 
         if( ch >= 0 && ch < 256 )
         {
             table[ ch ] = 1;
         }
         else
         {
             use_table = false;
             break;
         }
     }
 
     std::size_t const npos = static_cast< std::size_t >( -1 );
 
     std::size_t i = pos;
 
     if( use_table )
     {
         do
         {
             UCh ch = static_cast<UCh>( p_[ i ] );
 
             if( !( ch >= 0 && ch < 256 && table[ ch ] ) ) return i;
 
             --i;
         }
         while( i != npos );
     }
     else if( n >= 16 )
     {
         do
         {
             Ch ch = p_[ i ];
 
             if( std::char_traits<Ch>::find( s, n, ch ) == 0 ) return i;
 
             --i;
         }
         while( i != npos );
     }
     else
     {
         do
         {
             Ch ch = p_[ i ];
 
             bool r = false;
 
             for( std::size_t j = 0; j < n; ++j )
             {
                 if( s[ j ] == ch )
                 {
                     r = true;
                     break;
                 }
             }
 
             if( !r ) return i;
 
             --i;
         }
         while( i != npos );
     }
 
     return npos;
 }
 
 #if defined(__GNUC__) && __GNUC__ * 100 + __GNUC_MINOR__ >= 406
 # pragma GCC diagnostic pop
 #endif
 
 } // namespace detail
 
 template<class Ch> class basic_string_view
 {
 private:
 
     Ch const* p_;
     std::size_t n_;
 
 public:
 
     // types
 
     typedef std::char_traits<Ch> traits_type;
     typedef Ch value_type;
     typedef Ch* pointer;
     typedef Ch const* const_pointer;
     typedef Ch& reference;
     typedef Ch const& const_reference;
     typedef Ch const* const_iterator;
     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;
 
     // npos
 
     BOOST_STATIC_CONSTEXPR size_type npos = static_cast<size_type>( -1 );
 
 public:
 
     // construction and assignment
 
     BOOST_CONSTEXPR basic_string_view() BOOST_NOEXCEPT: p_(), n_()
     {
     }
 
     BOOST_CONSTEXPR basic_string_view( Ch const* str ) BOOST_NOEXCEPT: p_( str ), n_( traits_type::length( str ) )
     {
     }
 
     BOOST_CONSTEXPR basic_string_view( Ch const* str, size_type len ) BOOST_NOEXCEPT: p_( str ), n_( len )
     {
     }
 
     template<class End> BOOST_CXX14_CONSTEXPR basic_string_view( Ch const* first, End last,
         typename boost::enable_if<boost::core::detail::is_same<End, Ch const*>, int >::type = 0 ) BOOST_NOEXCEPT: p_( first ), n_( static_cast<size_type>( last - first ) )
     {
         BOOST_ASSERT( last - first >= 0 );
     }
 
     template<class A> basic_string_view( std::basic_string<Ch, std::char_traits<Ch>, A> const& str ) BOOST_NOEXCEPT: p_( str.data() ), n_( str.size() )
     {
     }
 
 #if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
 
     BOOST_CONSTEXPR basic_string_view( std::basic_string_view<Ch, std::char_traits<Ch> > const& str ) BOOST_NOEXCEPT: p_( str.data() ), n_( str.size() )
     {
     }
 
 #endif
 
     template<class Ch2> basic_string_view( boost::basic_string_view<Ch2, std::char_traits<Ch2> > const& str,
         typename boost::enable_if<boost::core::detail::is_same<Ch, Ch2>, int >::type = 0 ) BOOST_NOEXCEPT: p_( str.data() ), n_( str.size() )
     {
     }
 
 #if !defined(BOOST_NO_CXX11_NULLPTR)
 # if !defined(BOOST_NO_CXX11_DELETED_FUNCTIONS)
 
     basic_string_view( std::nullptr_t ) = delete;
 
 # else
 
 private:
 
     basic_string_view( std::nullptr_t );
 
 public:
 
 # endif
 #endif
 
     // BOOST_CONSTEXPR basic_string_view& operator=( basic_string_view const& ) BOOST_NOEXCEPT & = default;
 
     // conversions
 
     template<class A> operator std::basic_string<Ch, std::char_traits<Ch>, A>() const
     {
         return std::basic_string<Ch, std::char_traits<Ch>, A>( data(), size() );
     }
 
 #if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
 
     template<class Ch2, class En = typename boost::enable_if<boost::core::detail::is_same<Ch2, Ch> >::type>
     operator std::basic_string_view<Ch2>() const BOOST_NOEXCEPT
     {
         return std::basic_string_view<Ch>( data(), size() );
     }
 
 #endif
 
     template<class Ch2> operator boost::basic_string_view<Ch2,
         typename boost::enable_if<boost::core::detail::is_same<Ch2, Ch>, std::char_traits<Ch> >::type> () const BOOST_NOEXCEPT
     {
         return boost::basic_string_view< Ch, std::char_traits<Ch> >( data(), size() );
     }
 
     // iterator support
 
     BOOST_CONSTEXPR const_iterator begin() const BOOST_NOEXCEPT
     {
         return p_;
     }
 
     BOOST_CONSTEXPR const_iterator end() const BOOST_NOEXCEPT
     {
         return p_ + n_;
     }
 
     BOOST_CONSTEXPR const_iterator cbegin() const BOOST_NOEXCEPT
     {
         return p_;
     }
 
     BOOST_CONSTEXPR const_iterator cend() const BOOST_NOEXCEPT
     {
         return p_ + n_;
     }
 
     BOOST_CONSTEXPR const_reverse_iterator rbegin() const BOOST_NOEXCEPT
     {
         return const_reverse_iterator( end() );
     }
 
     BOOST_CONSTEXPR const_reverse_iterator rend() const BOOST_NOEXCEPT
     {
         return const_reverse_iterator( begin() );
     }
 
     BOOST_CONSTEXPR const_reverse_iterator crbegin() const BOOST_NOEXCEPT
     {
         return const_reverse_iterator( end() );
     }
 
     BOOST_CONSTEXPR const_reverse_iterator crend() const BOOST_NOEXCEPT
     {
         return const_reverse_iterator( begin() );
     }
 
     // capacity
 
     BOOST_CONSTEXPR size_type size() const BOOST_NOEXCEPT
     {
         return n_;
     }
 
     BOOST_CONSTEXPR size_type length() const BOOST_NOEXCEPT
     {
         return n_;
     }
 
     BOOST_CONSTEXPR size_type max_size() const BOOST_NOEXCEPT
     {
         return npos / sizeof( Ch );
     }
 
     BOOST_CONSTEXPR bool empty() const BOOST_NOEXCEPT
     {
         return n_ == 0;
     }
 
     // element access
 
     BOOST_CXX14_CONSTEXPR const_reference operator[]( size_type pos ) const BOOST_NOEXCEPT
     {
         BOOST_ASSERT( pos < size() );
         return p_[ pos ];
     }
 
     BOOST_CXX14_CONSTEXPR const_reference at( size_type pos ) const
     {
         if( pos >= size() )
         {
             boost::throw_exception( std::out_of_range( "basic_string_view::at" ), BOOST_CURRENT_LOCATION );
         }
 
         return p_[ pos ];
     }
 
     BOOST_CXX14_CONSTEXPR const_reference front() const BOOST_NOEXCEPT
     {
         BOOST_ASSERT( !empty() );
         return p_[ 0 ];
     }
 
     BOOST_CXX14_CONSTEXPR const_reference back() const BOOST_NOEXCEPT
     {
         BOOST_ASSERT( !empty() );
         return p_[ n_ - 1 ];
     }
 
     BOOST_CONSTEXPR const_pointer data() const BOOST_NOEXCEPT
     {
         return p_;
     }
 
     // modifiers
 
     BOOST_CXX14_CONSTEXPR void remove_prefix( size_type n ) BOOST_NOEXCEPT
     {
         BOOST_ASSERT( n <= size() );
 
         p_ += n;
         n_ -= n;
     }
 
     BOOST_CXX14_CONSTEXPR void remove_suffix( size_type n ) BOOST_NOEXCEPT
     {
         BOOST_ASSERT( n <= size() );
 
         n_ -= n;
     }
 
     BOOST_CXX14_CONSTEXPR void swap( basic_string_view& s ) BOOST_NOEXCEPT
     {
         std::swap( p_, s.p_ );
         std::swap( n_, s.n_ );
     }
 
     // string operations
 
     BOOST_CXX14_CONSTEXPR size_type copy( Ch* s, size_type n, size_type pos = 0 ) const
     {
         if( pos > size() )
         {
             boost::throw_exception( std::out_of_range( "basic_string_view::copy" ), BOOST_CURRENT_LOCATION );
         }
 
         std::size_t rlen = (std::min)( n, size() - pos );
 
         traits_type::copy( s, data() + pos, rlen );
 
         return rlen;
     }
 
     BOOST_CXX14_CONSTEXPR basic_string_view substr( size_type pos = 0, size_type n = npos ) const
     {
         if( pos > size() )
         {
             boost::throw_exception( std::out_of_range( "basic_string_view::substr" ), BOOST_CURRENT_LOCATION );
         }
 
         std::size_t rlen = (std::min)( n, size() - pos );
 
         return basic_string_view( data() + pos, rlen );
     }
 
     // compare
 
     BOOST_CXX14_CONSTEXPR int compare( basic_string_view str ) const BOOST_NOEXCEPT
     {
         std::size_t rlen = (std::min)( size(), str.size() );
 
         int cmp = traits_type::compare( data(), str.data(), rlen );
 
         if( cmp != 0 ) return cmp;
 
         if( size() == str.size() ) return 0;
 
         return size() < str.size()? -1: +1;
     }
 
     BOOST_CONSTEXPR int compare( size_type pos1, size_type n1, basic_string_view str ) const
     {
         return substr( pos1, n1 ).compare( str );
     }
 
     BOOST_CONSTEXPR int compare( size_type pos1, size_type n1, basic_string_view str, size_type pos2, size_type n2 ) const
     {
         return substr( pos1, n1 ).compare( str.substr( pos2, n2 ) );
     }
 
     BOOST_CONSTEXPR int compare( Ch const* s ) const BOOST_NOEXCEPT
     {
         return compare( basic_string_view( s ) );
     }
 
     BOOST_CONSTEXPR int compare( size_type pos1, size_type n1, Ch const* s ) const
     {
         return substr( pos1, n1 ).compare( basic_string_view( s ) );
     }
 
     BOOST_CONSTEXPR int compare( size_type pos1, size_type n1, Ch const* s, size_type n2 ) const
     {
         return substr( pos1, n1 ).compare( basic_string_view( s, n2 ) );
     }
 
     // starts_with
 
     BOOST_CONSTEXPR bool starts_with( basic_string_view x ) const BOOST_NOEXCEPT
     {
         return size() >= x.size() && traits_type::compare( data(), x.data(), x.size() ) == 0;
     }
 
     BOOST_CONSTEXPR bool starts_with( Ch x ) const BOOST_NOEXCEPT
     {
         return !empty() && front() == x;
     }
 
     BOOST_CONSTEXPR bool starts_with( Ch const* x ) const BOOST_NOEXCEPT
     {
         return starts_with( basic_string_view( x ) );
     }
 
     // ends_with
 
     BOOST_CONSTEXPR bool ends_with( basic_string_view x ) const BOOST_NOEXCEPT
     {
         return size() >= x.size() && traits_type::compare( data() + size() - x.size(), x.data(), x.size() ) == 0;
     }
 
     BOOST_CONSTEXPR bool ends_with( Ch x ) const BOOST_NOEXCEPT
     {
         return !empty() && back() == x;
     }
 
     BOOST_CONSTEXPR bool ends_with( Ch const* x ) const BOOST_NOEXCEPT
     {
         return ends_with( basic_string_view( x ) );
     }
 
     // find
 
     BOOST_CONSTEXPR size_type find( basic_string_view str, size_type pos = 0 ) const BOOST_NOEXCEPT
     {
         return find( str.data(), pos, str.size() );
     }
 
     BOOST_CXX14_CONSTEXPR size_type find( Ch c, size_type pos = 0 ) const BOOST_NOEXCEPT
     {
         if( pos >= size() ) return npos;
 
         Ch const* r = traits_type::find( data() + pos, size() - pos, c );
 
         return r? static_cast<size_type>( r - data() ): npos;
     }
 
     BOOST_CXX14_CONSTEXPR size_type find( Ch const* s, size_type pos, size_type n ) const BOOST_NOEXCEPT
     {
         if( n == 1 ) return find( s[0], pos );
 
         if( pos + n > size() ) return npos;
         if( n == 0 ) return pos;
 
         Ch const* p = data() + pos;
         Ch const* last = data() + size() - n + 1;
 
         for( ;; )
         {
             p = traits_type::find( p, static_cast<size_type>( last - p ), s[0] );
 
             if( p == 0 ) break;
 
             if( traits_type::compare( p + 1, s + 1, n - 1 ) == 0 ) return static_cast<size_type>( p - data() );
 
             ++p;
         }
 
         return npos;
     }
 
     BOOST_CONSTEXPR size_type find( Ch const* s, size_type pos = 0 ) const BOOST_NOEXCEPT
     {
         return find( s, pos, traits_type::length( s ) );
     }
 
     // rfind
 
     BOOST_CONSTEXPR size_type rfind( basic_string_view str, size_type pos = npos ) const BOOST_NOEXCEPT
     {
         return rfind( str.data(), pos, str.size() );
     }
 
     BOOST_CXX14_CONSTEXPR size_type rfind( Ch c, size_type pos = npos ) const BOOST_NOEXCEPT
     {
         size_type n = size();
 
         if( n == 0 )
         {
             return npos;
         }
 
         if( pos > n - 1 )
         {
             pos = n - 1;
         }
 
         do
         {
             if( p_[ pos ] == c ) return pos;
             --pos;
         }
         while( pos != npos );
 
         return npos;
     }
 
     BOOST_CXX14_CONSTEXPR size_type rfind( Ch const* s, size_type pos, size_type n ) const BOOST_NOEXCEPT
     {
         if( n > size() ) return npos;
 
         if( pos > size() - n )
         {
             pos = size() - n;
         }
 
         if( n == 0 ) return pos;
 
         for( ;; )
         {
             size_type xpos = rfind( s[0], pos );
 
             if( xpos == npos ) return npos;
 
             if( traits_type::compare( data() + xpos, s, n ) == 0 ) return xpos;
 
             if( xpos == 0 ) return npos;
 
             pos = xpos - 1;
         }
     }
 
     BOOST_CONSTEXPR size_type rfind( Ch const* s, size_type pos = npos ) const BOOST_NOEXCEPT
     {
         return rfind( s, pos, traits_type::length( s ) );
     }
 
     // find_first_of
 
     BOOST_CXX14_CONSTEXPR size_type find_first_of( basic_string_view str, size_type pos = 0 ) const BOOST_NOEXCEPT
     {
         return find_first_of( str.data(), pos, str.size() );
     }
 
     BOOST_CONSTEXPR size_type find_first_of( Ch c, size_type pos = 0 ) const BOOST_NOEXCEPT
     {
         return find( c, pos );
     }
 
     BOOST_CXX14_CONSTEXPR size_type find_first_of( Ch const* s, size_type pos, size_type n ) const BOOST_NOEXCEPT
     {
         if( n == 0 || pos >= size() ) return npos;
         if( n == 1 ) return find( s[0], pos );
 
         return detail::find_first_of( data(), size(), s, pos, n );
     }
 
     BOOST_CXX14_CONSTEXPR size_type find_first_of( Ch const* s, size_type pos = 0 ) const BOOST_NOEXCEPT
     {
         return find_first_of( s, pos, traits_type::length( s ) );
     }
 
     // find_last_of
 
     BOOST_CXX14_CONSTEXPR size_type find_last_of( basic_string_view str, size_type pos = npos ) const BOOST_NOEXCEPT
     {
         return find_last_of( str.data(), pos, str.size() );
     }
 
     BOOST_CONSTEXPR size_type find_last_of( Ch c, size_type pos = npos ) const BOOST_NOEXCEPT
     {
         return rfind( c, pos );
     }
 
     BOOST_CXX14_CONSTEXPR size_type find_last_of( Ch const* s, size_type pos, size_type n ) const BOOST_NOEXCEPT
     {
         if( n == 1 )
         {
             return rfind( s[0], pos );
         }
 
         size_type m = size();
 
         if( m == 0 )
         {
             return npos;
         }
 
         if( pos > m - 1 )
         {
             pos = m - 1;
         }
 
         return detail::find_last_of( data(), s, pos, n );
     }
 
     BOOST_CXX14_CONSTEXPR size_type find_last_of( Ch const* s, size_type pos = npos ) const BOOST_NOEXCEPT
     {
         return find_last_of( s, pos, traits_type::length( s ) );
     }
 
     // find_first_not_of
 
     BOOST_CXX14_CONSTEXPR size_type find_first_not_of( basic_string_view str, size_type pos = 0 ) const BOOST_NOEXCEPT
     {
         return find_first_not_of( str.data(), pos, str.size() );
     }
 
     BOOST_CXX14_CONSTEXPR size_type find_first_not_of( Ch c, size_type pos = 0 ) const BOOST_NOEXCEPT
     {
         for( std::size_t i = pos; i < n_; ++i )
         {
             if( p_[ i ] != c ) return i;
         }
 
         return npos;
     }
 
     BOOST_CXX14_CONSTEXPR size_type find_first_not_of( Ch const* s, size_type pos, size_type n ) const BOOST_NOEXCEPT
     {
         if( pos >= size() ) return npos;
         if( n == 1 ) return find_first_not_of( s[0], pos );
 
         return detail::find_first_not_of( data(), size(), s, pos, n );
     }
 
     BOOST_CXX14_CONSTEXPR size_type find_first_not_of( Ch const* s, size_type pos = 0 ) const BOOST_NOEXCEPT
     {
         return find_first_not_of( s, pos, traits_type::length( s ) );
     }
 
     // find_last_not_of
 
     BOOST_CXX14_CONSTEXPR size_type find_last_not_of( basic_string_view str, size_type pos = npos ) const BOOST_NOEXCEPT
     {
         return find_last_not_of( str.data(), pos, str.size() );
     }
 
     BOOST_CXX14_CONSTEXPR size_type find_last_not_of( Ch c, size_type pos = npos ) const BOOST_NOEXCEPT
     {
         size_type m = size();
 
         if( m == 0 )
         {
             return npos;
         }
 
         if( pos > m - 1 )
         {
             pos = m - 1;
         }
 
         do
         {
             if( p_[ pos ] != c ) return pos;
             --pos;
         }
         while( pos != npos );
 
         return npos;
     }
 
     BOOST_CXX14_CONSTEXPR size_type find_last_not_of( Ch const* s, size_type pos, size_type n ) const BOOST_NOEXCEPT
     {
         if( n == 1 )
         {
             return find_last_not_of( s[0], pos );
         }
 
         size_type m = size();
 
         if( m == 0 )
         {
             return npos;
         }
 
         if( pos > m - 1 )
         {
             pos = m - 1;
         }
 
         return detail::find_last_not_of( data(), s, pos, n );
     }
 
     BOOST_CXX14_CONSTEXPR size_type find_last_not_of( Ch const* s, size_type pos = npos ) const BOOST_NOEXCEPT
     {
         return find_last_not_of( s, pos, traits_type::length( s ) );
     }
 
     // contains
 
     BOOST_CONSTEXPR bool contains( basic_string_view sv ) const BOOST_NOEXCEPT
     {
         return find( sv ) != npos;
     }
 
     BOOST_CXX14_CONSTEXPR bool contains( Ch c ) const BOOST_NOEXCEPT
     {
         Ch const* p = data();
         size_type n = size();
 
         if( n >= 16 )
         {
             return traits_type::find( p, n, c ) != 0;
         }
         else
         {
             for( size_type i = 0; i < n; ++i )
             {
                 if( p[ i ] == c ) return true;
             }
 
             return false;
         }
     }
 
     BOOST_CONSTEXPR bool contains( Ch const* s ) const BOOST_NOEXCEPT
     {
         return find( s ) != npos;
     }
 
     // relational operators
 
     BOOST_CXX14_CONSTEXPR friend bool operator==( basic_string_view sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv1.size() == sv2.size() && traits_type::compare( sv1.data(), sv2.data(), sv1.size() ) == 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator!=( basic_string_view sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return !( sv1 == sv2 );
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator<( basic_string_view sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) < 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator<=( basic_string_view sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) <= 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator>( basic_string_view sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) > 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator>=( basic_string_view sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) >= 0;
     }
 
 #if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
 
     // "sufficient number of additional overloads"
 
     // against std::string_view
 
     BOOST_CXX14_CONSTEXPR friend bool operator==( basic_string_view sv1, std::basic_string_view<Ch> sv2 ) BOOST_NOEXCEPT
     {
         return sv1.size() == sv2.size() && traits_type::compare( sv1.data(), sv2.data(), sv1.size() ) == 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator==( std::basic_string_view<Ch> sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv1.size() == sv2.size() && traits_type::compare( sv1.data(), sv2.data(), sv1.size() ) == 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator!=( basic_string_view sv1, std::basic_string_view<Ch> sv2 ) BOOST_NOEXCEPT
     {
         return !( sv1 == sv2 );
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator!=( std::basic_string_view<Ch> sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return !( sv1 == sv2 );
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator<( basic_string_view sv1, std::basic_string_view<Ch> sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) < 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator<( std::basic_string_view<Ch> sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) < 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator<=( basic_string_view sv1, std::basic_string_view<Ch> sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) <= 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator<=( std::basic_string_view<Ch> sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) <= 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator>( basic_string_view sv1, std::basic_string_view<Ch> sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) > 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator>( std::basic_string_view<Ch> sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) > 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator>=( basic_string_view sv1, std::basic_string_view<Ch> sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) >= 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator>=( std::basic_string_view<Ch> sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) >= 0;
     }
 
     // against Ch const*
 
     BOOST_CXX14_CONSTEXPR friend bool operator==( basic_string_view sv1, Ch const* sv2 ) BOOST_NOEXCEPT
     {
         return sv1 == basic_string_view( sv2 );
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator==( Ch const* sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return basic_string_view( sv1 ) == sv2;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator!=( basic_string_view sv1, Ch const* sv2 ) BOOST_NOEXCEPT
     {
         return !( sv1 == sv2 );
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator!=( Ch const* sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return !( sv1 == sv2 );
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator<( basic_string_view sv1, Ch const* sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) < 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator<( Ch const* sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv2.compare( sv1 ) > 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator<=( basic_string_view sv1, Ch const* sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) <= 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator<=( Ch const* sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv2.compare( sv1 ) >= 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator>( basic_string_view sv1, Ch const* sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) > 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator>( Ch const* sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv2.compare( sv1 ) < 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator>=( basic_string_view sv1, Ch const* sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) >= 0;
     }
 
     BOOST_CXX14_CONSTEXPR friend bool operator>=( Ch const* sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv2.compare( sv1 ) <= 0;
     }
 
     // against std::string
 
     template<class A> BOOST_CXX14_CONSTEXPR friend bool operator==( basic_string_view sv1, std::basic_string<Ch, std::char_traits<Ch>, A> const& sv2 ) BOOST_NOEXCEPT
     {
         return sv1.size() == sv2.size() && traits_type::compare( sv1.data(), sv2.data(), sv1.size() ) == 0;
     }
 
     template<class A> BOOST_CXX14_CONSTEXPR friend bool operator==( std::basic_string<Ch, std::char_traits<Ch>, A> const& sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv1.size() == sv2.size() && traits_type::compare( sv1.data(), sv2.data(), sv1.size() ) == 0;
     }
 
     template<class A> BOOST_CXX14_CONSTEXPR friend bool operator!=( basic_string_view sv1, std::basic_string<Ch, std::char_traits<Ch>, A> const& sv2 ) BOOST_NOEXCEPT
     {
         return !( sv1 == sv2 );
     }
 
     template<class A> BOOST_CXX14_CONSTEXPR friend bool operator!=( std::basic_string<Ch, std::char_traits<Ch>, A> const& sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return !( sv1 == sv2 );
     }
 
     template<class A> BOOST_CXX14_CONSTEXPR friend bool operator<( basic_string_view sv1, std::basic_string<Ch, std::char_traits<Ch>, A> const& sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) < 0;
     }
 
     template<class A> BOOST_CXX14_CONSTEXPR friend bool operator<( std::basic_string<Ch, std::char_traits<Ch>, A> const& sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv2.compare( sv1 ) > 0;
     }
 
     template<class A> BOOST_CXX14_CONSTEXPR friend bool operator<=( basic_string_view sv1, std::basic_string<Ch, std::char_traits<Ch>, A> const& sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) <= 0;
     }
 
     template<class A> BOOST_CXX14_CONSTEXPR friend bool operator<=( std::basic_string<Ch, std::char_traits<Ch>, A> const& sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv2.compare( sv1 ) >= 0;
     }
 
     template<class A> BOOST_CXX14_CONSTEXPR friend bool operator>( basic_string_view sv1, std::basic_string<Ch, std::char_traits<Ch>, A> const& sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) > 0;
     }
 
     template<class A> BOOST_CXX14_CONSTEXPR friend bool operator>( std::basic_string<Ch, std::char_traits<Ch>, A> const& sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv2.compare( sv1 ) < 0;
     }
 
     template<class A> BOOST_CXX14_CONSTEXPR friend bool operator>=( basic_string_view sv1, std::basic_string<Ch, std::char_traits<Ch>, A> const& sv2 ) BOOST_NOEXCEPT
     {
         return sv1.compare( sv2 ) >= 0;
     }
 
     template<class A> BOOST_CXX14_CONSTEXPR friend bool operator>=( std::basic_string<Ch, std::char_traits<Ch>, A> const& sv1, basic_string_view sv2 ) BOOST_NOEXCEPT
     {
         return sv2.compare( sv1 ) <= 0;
     }
 
 #endif
 };
 
 // stream inserter
 
 template<class Ch> std::basic_ostream<Ch>& operator<<( std::basic_ostream<Ch>& os, basic_string_view<Ch> str )
 {
     Ch const* p = str.data();
     std::streamsize n = static_cast<std::streamsize>( str.size() );
 
     std::streamsize m = os.width();
 
     if( n >= m )
     {
         os.write( p, n );
     }
     else if( ( os.flags() & std::ios_base::adjustfield ) == std::ios_base::left )
     {
         os.write( p, n );
 
         os.width( m - n );
         os << "";
     }
     else
     {
         os.width( m - n );
         os << "";
 
         os.write( p, n );
     }
 
     os.width( 0 );
     return os;
 }
 
 #if defined(BOOST_NO_CXX17_INLINE_VARIABLES)
 template<class Ch> BOOST_CONSTEXPR_OR_CONST std::size_t basic_string_view<Ch>::npos;
 #endif
 
 // typedef names
 
 typedef basic_string_view<char> string_view;
 typedef basic_string_view<wchar_t> wstring_view;
 
 #if !defined(BOOST_NO_CXX11_CHAR16_T)
 typedef basic_string_view<char16_t> u16string_view;
 #endif
 
 #if !defined(BOOST_NO_CXX11_CHAR32_T)
 typedef basic_string_view<char32_t> u32string_view;
 #endif
 
 #if defined(__cpp_char8_t) && __cpp_char8_t >= 201811L
 typedef basic_string_view<char8_t> u8string_view;
 #endif
 
 } // namespace core
 } // namespace boost
 
 // std::common_reference support
 // needed for iterators that have reference=string_view and value_type=std::string
 
 #if !defined(BOOST_NO_CXX20_HDR_CONCEPTS)
 
 template<class Ch, class A, template<class> class Q1, template<class> class Q2>
 struct std::basic_common_reference<
     boost::core::basic_string_view<Ch>,
     std::basic_string<Ch, std::char_traits<Ch>, A>,
     Q1, Q2>
 {
     using type = boost::core::basic_string_view<Ch>;
 };
 
 template<class Ch, class A, template<class> class Q1, template<class> class Q2>
 struct std::basic_common_reference<
     std::basic_string<Ch, std::char_traits<Ch>, A>,
     boost::core::basic_string_view<Ch>,
     Q1, Q2>
 {
     using type = boost::core::basic_string_view<Ch>;
 };
 
 #endif
 
 #endif  // #ifndef BOOST_CORE_STRING_VIEW_HPP_INCLUDED

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