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Added ref-qualifiers to some accessors
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@ -37,7 +37,7 @@ void assertion_failed (char const * expr, char const * func, char const * file,
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using boost::optional ;
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template<class T> inline void unused_variable ( T ) {}
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template<class T> inline void unused_variable ( const T& ) {}
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#ifdef BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP
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using boost::swap ;
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