Returns the zero-based index of the alternative that is currently held by the variant.
If the variant is valueless_by_exception, returns variant_npos.
#include <iostream>
#include <string>
#include <variant>
int main()
{
std::variant<int, std::string> v = "abc";
std::cout << "v.index = " << v.index() << '\n';
v = {};
std::cout << "v.index = " << v.index() << '\n';
}
Output:
[edit] See also checks if avariant currently holds a given type
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