Checks if a type _T_ is convertible to one of the types from the type list _Ts_.  
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#include "utility.hpp"
Checks if a type _T_ is convertible to one of the types from the type list _Ts_. 
Provides the constexpr value that is equal to the index of the type from the type list _Ts_ which the given type _T_ can be converted to by using implicit conversion. The index starts from 1 up to sizeof...(_Ts_) or is 0 otherwise. 
Definition at line 115 of file utility.hpp.