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#pragma once
#include "typetraits.h"
/**
* Helper type that can be used as one of the parameters in function declaration
* to limit the number of types this function can be called with.
*
* Example usage:
* @code
* void CharOnlyFunction(TExplicitType<char> value);
* void AnythingFunction(char value);
*
* CharOnlyFunction('c'); // Works.
* CharOnlyFunction(1); // Compilation error.
* CharOnlyFunction(1ull); // Compilation error.
*
* AnythingFunction('c'); // Works.
* AnythingFunction(1); // Works.
* AnythingFunction(1ull); // Works.
* @endcode
*/
template <class T>
class TExplicitType {
public:
template <class OtherT>
TExplicitType(const OtherT& value Y_LIFETIME_BOUND, std::enable_if_t<std::is_same<OtherT, T>::value>* = nullptr) noexcept
: Value_(value)
{
}
const T& Value() const noexcept {
return Value_;
}
operator const T&() const noexcept {
return Value_;
}
private:
const T& Value_;
};
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