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The C++ Type Loophole (C++14)
Recently I was doing some work on retrieving struct data member types. And as I was exploring, researching and testing ideas I uncovered this pearl:
template struct tag{};
template
struct loophole_t { friend auto loophole(tag) { return T{}; };
};
auto loophole(tag);
sizeof( loophole_t ); std::is_same std::string, decltype( loophole(tag{}) ) ::value;