Varint index

template <typename> struct tag { };

template <typename T, typename V>
struct variant_index;

template <typename T, typename... Ts> 
struct variant_index<T, std::variant<Ts...>>
    : std::integral_constant<size_t, std::variant<tag<Ts>...>(tag<T>()).index()>
{ };

// Use as: variant_index<TYPE, VARIANT>::value

Source: stackoverflow.com

Similar codes

0 vote200 views1 answer
Printing in column c++
C++
0 vote177 views1 answer
C++ print number not in scientific notation
C++
0 vote188 views1 answer
Powers of 2 in cpp
C++
17 votes173 views1 answer
Input a string in c++
C++
10 votes209 views2 answers
2d vector c++ declaration
C++
0 vote179 views1 answer
Person parametr cpp
C++
0 vote198 views1 answer
3 conditions for a while loop c++
C++
0 vote188 views3 answers
Dynamic memory c++
C++
0 vote202 views1 answer
How to seek to the start of afile in c++
C++
27 votes271 views2 answers
How to remove an element from a vector by value c++
C++