Chris@16: // Boost.Range library
Chris@16: //
Chris@16: //  Copyright Thorsten Ottosen 2003-2004. Use, modification and
Chris@16: //  distribution is subject to the Boost Software License, Version
Chris@16: //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // For more information, see http://www.boost.org/libs/range/
Chris@16: //
Chris@16: 
Chris@16: #ifndef BOOST_RANGE_DETAIL_EMPTY_HPP
Chris@16: #define BOOST_RANGE_DETAIL_EMPTY_HPP
Chris@16: 
Chris@16: #include <boost/range/detail/common.hpp>
Chris@16: 
Chris@16: namespace boost 
Chris@16: {
Chris@16:     namespace range_detail
Chris@16:     {
Chris@16:         template< typename T >
Chris@16:         struct range_empty;
Chris@16: 
Chris@16:         //////////////////////////////////////////////////////////////////////
Chris@16:         // default
Chris@16:         //////////////////////////////////////////////////////////////////////
Chris@16:         
Chris@16:         template<>
Chris@16:         struct range_empty<std_container_>
Chris@16:         {
Chris@16:             template< typename C >
Chris@16:             static bool fun( C& c )
Chris@16:             {
Chris@16:                 return c.empty();
Chris@16:             };
Chris@16:         };
Chris@16:                     
Chris@16:         //////////////////////////////////////////////////////////////////////
Chris@16:         // pair
Chris@16:         //////////////////////////////////////////////////////////////////////
Chris@16:         
Chris@16:         template<>
Chris@16:         struct range_empty<std_pair_>
Chris@16:         {
Chris@16:             template< typename P >
Chris@16:             static bool fun( const P& p )
Chris@16:             {
Chris@16:                 return p.first == p.second;
Chris@16:             }
Chris@16:         };
Chris@16:  
Chris@16:         //////////////////////////////////////////////////////////////////////
Chris@16:         // array
Chris@16:         //////////////////////////////////////////////////////////////////////
Chris@16:         
Chris@16:         template<>
Chris@16:         struct range_empty<array_>
Chris@16:         {
Chris@16:             template< typename T, std::size_t sz >
Chris@16:             static bool fun( T BOOST_ARRAY_REF[sz] )
Chris@16:             {
Chris@16:                 if( boost_range_array == 0 )
Chris@16:                     return true;
Chris@16:                 return false;
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         //////////////////////////////////////////////////////////////////////
Chris@16:         // string
Chris@16:         //////////////////////////////////////////////////////////////////////
Chris@16:         
Chris@16:         template<>
Chris@16:         struct range_empty<char_ptr_>
Chris@16:         {
Chris@16:             static bool fun( const char* s )
Chris@16:             {
Chris@16:                 return s == 0 || s[0] == 0;
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         template<>
Chris@16:         struct range_empty<const_char_ptr_>
Chris@16:         {
Chris@16:             static bool fun( const char* s )
Chris@16:             {
Chris@16:                 return  s == 0 || s[0] == 0;
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         template<>
Chris@16:         struct range_empty<wchar_t_ptr_>
Chris@16:         {
Chris@16:             static bool fun( const wchar_t* s )
Chris@16:             {
Chris@16:                 return  s == 0 || s[0] == 0;
Chris@16:             }
Chris@16:         };
Chris@16:         
Chris@16:         template<>
Chris@16:         struct range_empty<const_wchar_t_ptr_>
Chris@16:         {
Chris@16:             static bool fun( const wchar_t* s )
Chris@16:             {
Chris@16:                 return  s == 0 || s[0] == 0;
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:     } // namespace 'range_detail'
Chris@16:     
Chris@16:         
Chris@16:     template< typename C >
Chris@16:     inline bool 
Chris@16:     empty( const C& c )
Chris@16:     {
Chris@16:         return range_detail::range_empty<  BOOST_RANGE_DEDUCED_TYPENAME range_detail::range<C>::type >::fun( c );
Chris@16:     }
Chris@16: 
Chris@16: } // namespace 'boost'
Chris@16: 
Chris@16: 
Chris@16: #endif