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std::holds_alternative - cppreference.com
template< class T, class... Types >
constexpr bool holds_alternative( const std::variant<Types...>& v ) noexcept; (since C++17)
Checks if the variant v holds the alternative T. The call is ill-formed if T does not appear exactly once in Types...
[edit] Parameters [edit] Return value
true if the variant currently holds the alternative T, false otherwise.
[edit] Example [edit] See also returns the zero-based index of the alternative held by the variant
(public member function) [edit] reads the value of the variant given the index or the type (if the type is unique), throws on error
(function template) [edit]
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