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boost::forward
// In header: <boost/move/utility_core.hpp> template<typename T> output_reference forward(input_reference);
This function provides limited form of forwarding that is usually enough for in-place construction and avoids the exponential overloading for achieve the limited forwarding in C++03.
For compilers with rvalue references this function provides perfect forwarding.
Otherwise:
If input_reference binds to const ::boost::rv<T> & then it output_reference is ::boost::rv<T> &
Else, output_reference is equal to input_reference.