code. compile. run. debug. share.
#include <type_traits>
using namespace std;
namespace {
template <typename T>
using BaseDifferenceType = decltype (T{} - T{});
}
int main ()
{
using T = int;
static_assert(! is_enum_v<T>);
BaseDifferenceType<T> xxx {};
using aaa = conditional_t<is_enum_v<T>, underlying_type_t<T>, BaseDifferenceType<T>>;
return 0;
}
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