Defined in header <variant> | ||
|---|---|---|
inline constexpr std::size_t variant_npos = -1; | (since C++17) |
This is a special value equal to the largest value representable by the type std::size_t, used as the return type of index() when valueless_by_exception() is true.
| returns the zero-based index of the alternative held by the variant (public member function) |
|
| checks if the variant is in the invalid state (public member function) |
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
http://en.cppreference.com/w/cpp/utility/variant/variant_npos