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