#include <apibase.h>

详细描述

template<typename... T>
template<typename X>
struct maxon::ParameterPack< T >::IndexOf< X >

IndexOf finds the index of type X in the parameter pack T. The index can be found in the member value of IndexOf . If there is no unique such index because X doesn't exist at all in T or exists more than once, a negative value is used. The member found counts the number of occurrences.

ParameterPack<Int, Float, String, String>::IndexOf< Float > ::value == 1 ParameterPack<Int, Float, String, String>::IndexOf< String > ::value < 0 // Ambiguous. ParameterPack<Int, Float, String, String>::IndexOf< String > ::found == 2 ParameterPack<Int, Float, String, String>::IndexOf< Char > ::value < 0 // Not found.