imgtools/imglib/boostlibrary/boost/range/detail/empty.hpp
author Jon Chatten
Mon, 18 Jan 2010 09:02:25 +0000
branchfix
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Release note: sf bug 1558: [Raptor] auto-setting of SBS_HOME by sbs.bat fails when drives differ
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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