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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.