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        The header <boost/core/ignore_unused.hpp>
        defines the function template boost::ignore_unused(). It may be used to suppress the "unused
        variable" or "unused local typedefs" compiler warnings when
        the variable or typedef can't be removed or commented out, e.g. when some
        blocks of the code are conditionally activated. C++11 variadic templates
        are used if they're supported, otherwise they're emulated with overloads.
      
boost::ignore_unused(v1, v2, v3); boost::ignore_unused<T1, T2, T3>();
int fun( int foo, int bar ) { boost::ignore_unused(bar); #ifdef ENABLE_DEBUG_OUTPUT if ( foo < bar ) std::cerr << "warning! foo < bar"; #endif return foo + 2; }
        boost::ignore_unused()
        was contributed by Adam Wulkiewicz.