2012-05-16 01:42:04 +00:00
|
|
|
// Boost.Range library
|
|
|
|
//
|
|
|
|
// Copyright Thorsten Ottosen 2003-2004. Use, modification and
|
|
|
|
// distribution is subject to 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/libs/range/
|
|
|
|
//
|
|
|
|
|
|
|
|
#ifndef BOOST_RANGE_DETAIL_EMPTY_HPP
|
|
|
|
#define BOOST_RANGE_DETAIL_EMPTY_HPP
|
|
|
|
|
|
|
|
#include <boost/range/detail/common.hpp>
|
|
|
|
|
|
|
|
namespace boost
|
|
|
|
{
|
|
|
|
namespace range_detail
|
|
|
|
{
|
|
|
|
template< typename T >
|
|
|
|
struct range_empty;
|
|
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
// default
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
|
|
template<>
|
|
|
|
struct range_empty<std_container_>
|
|
|
|
{
|
|
|
|
template< typename C >
|
|
|
|
static bool fun( C& c )
|
|
|
|
{
|
|
|
|
return c.empty();
|
|
|
|
};
|
|
|
|
};
|
|
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
// pair
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
|
|
template<>
|
|
|
|
struct range_empty<std_pair_>
|
|
|
|
{
|
|
|
|
template< typename P >
|
|
|
|
static bool fun( const P& p )
|
|
|
|
{
|
|
|
|
return p.first == p.second;
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
// array
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
|
|
template<>
|
|
|
|
struct range_empty<array_>
|
|
|
|
{
|
|
|
|
template< typename T, std::size_t sz >
|
|
|
|
static bool fun( T BOOST_ARRAY_REF[sz] )
|
|
|
|
{
|
|
|
|
if( boost_range_array == 0 )
|
|
|
|
return true;
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
// string
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
|
|
template<>
|
|
|
|
struct range_empty<char_ptr_>
|
|
|
|
{
|
|
|
|
static bool fun( const char* s )
|
|
|
|
{
|
|
|
|
return s == 0 || s[0] == 0;
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
template<>
|
|
|
|
struct range_empty<const_char_ptr_>
|
|
|
|
{
|
|
|
|
static bool fun( const char* s )
|
|
|
|
{
|
|
|
|
return s == 0 || s[0] == 0;
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
template<>
|
|
|
|
struct range_empty<wchar_t_ptr_>
|
|
|
|
{
|
|
|
|
static bool fun( const wchar_t* s )
|
|
|
|
{
|
|
|
|
return s == 0 || s[0] == 0;
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
template<>
|
|
|
|
struct range_empty<const_wchar_t_ptr_>
|
|
|
|
{
|
|
|
|
static bool fun( const wchar_t* s )
|
|
|
|
{
|
|
|
|
return s == 0 || s[0] == 0;
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
} // namespace 'range_detail'
|
|
|
|
|
|
|
|
|
|
|
|
template< typename C >
|
|
|
|
inline bool
|
|
|
|
empty( const C& c )
|
|
|
|
{
|
|
|
|
return range_detail::range_empty< BOOST_RANGE_DEDUCED_TYPENAME range_detail::range<C>::type >::fun( c );
|
|
|
|
}
|
|
|
|
|
|
|
|
} // namespace 'boost'
|
|
|
|
|
|
|
|
|
|
|
|
#endif
|