The std::declval Type Operator
Discover the capabilities and usage of the std::declval type operator in C++ metaprogramming.
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The std::declval
is a utility type operation function, available in the <utility>
header. It’s in the same category as functions such as std::move
and std::forward
that we have already seen. What it does is very simple: it adds an rvalue reference to its type template argument. The declaration of this function looks as follows:
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