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) |
? cppreference.com
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