#include <utility>
 
// Note: I've revised my implementation of AUTO_FUN here
// to make its use look more like a function definition
 
#define AUTO_FUN_IMPL( ... ) decltype( __VA_ARGS__ ) { return __VA_ARGS__; }
 
#define AUTO_FUN( name_and_param_list ) auto name_and_param_list-> AUTO_FUN_IMPL
 
template< typename SourceType >