std::variant_npos
Defined in header <variant> | | |
|---|---|---|
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
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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