author | marvin shi <marvin.shi@nokia.com> |
Fri, 19 Nov 2010 13:37:08 +0800 | |
changeset 698 | e3ee96a3961c |
parent 0 | 044383f39525 |
permissions | -rw-r--r-- |
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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 |