| 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.
| 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) |
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