std::forward is a utility function provided by the C++ Standard Library, available in the "utility" header. It is used primarily in conjunction with rvalue references (introduced in C++11) to achieve perfect forwarding.
The purpose of std::forward is to enable perfect forwarding of function arguments, preserving their original value categories (lvalue or rvalue) and constness. This is crucial when passing arguments to other functions or constructors, especially in template code where the exact types of the arguments may not be known in advance.
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