std::forward (C++)

Perfect forwarding is a technique in C++ template programming that allows a function to forward its arguments to another function, preserving the argument’s Value Category (whether it is an lvalue or rvalue).

template<class T>
void wrapper(T&& arg)
{
    // arg is always lvalue
    foo(std::forward<T>(arg)); // Forward as lvalue or as rvalue, depending on T
}

Perfect forwarding in C++ is a technique that enables a function template to accept arguments and then pass them to another function (or constructor) while meticulously preserving their original value category (lvalue or rvalue) and const-qualification

Related

• std::move