# std::variant_npos

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< cpp‎ | utility‎ | variant

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`

### See also

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

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