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std::variant_npos

性病：变体[医]非营利组织

Defined in header ​​
inline constexpr std::size_t variant_npos = -1;​(since C++17)

这是一个特殊值，等于按类型表示的最大值。std::size_t的返回类型index()何时valueless_by_exception()是true...

另见

indexreturns the zero-based index of the alternative held by the variant (public member function)
valueless_by_exceptionchecks if the variant is in the invalid state (public member function)

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