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std::variant_npos

From cppreference.com
< cpp‎ | utility‎ | variant
 
 
 
 
Defined in header <variant>
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

[edit] See also

returns the zero-based index of the alternative held by the variant
(public member function) [edit]
checks if the variant is in the invalid state
(public member function) [edit]