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Why in C++ presented two functions with different names ref and cref? Why not the only overloaded ref function? Are there some important semantic reasons?
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An std::reference_wrapper is a copyable and assignable object that emulates a reference. Contrary to its name, it does not wrap a reference. It works by encapsulating a pointer (T*) and by implicitly converting to a reference (T&).
The cref() is a built-in function of the C++ programming language provided in the reference_wrapper standard library. It is a helper function that uses the template argument deduction for generating an object of reference_wrapper type while determining the result's template argument.
Because sometimes you want to wrap a const reference to a non-const object. In such cases, std::cref allows you to write
std::cref(x)
instead of
std::ref(static_cast<const T&>(x))
(where T is of course the type of x).
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