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Jan 3, 2025 · Applies the visitor vis (a Callable that can be called with any combination of types from the variant) to the variant held by self.

Mar 1, 2025 · Notes Let n be (1* ... *std::variant_size_v<std::remove_reference_t<VariantBases>>), implementations usually generate a table equivalent to an (possibly multidimensional) array of n …

Dec 19, 2024 · Functions visit (C++17) calls the provided functor with the arguments held by one or more variant s (function template) [edit] holds_alternative (C++17) checks if a variant currently holds a …

Feb 19, 2025 · variant::visit (C++26) Non-member functions visit(std::variant) holds_alternative get(std::variant) get_if operator==operator!=operator<operator<=operator>operator>=operator<=> …

Dec 16, 2017 · Comprehensive C++ reference guide covering language features, standard library, and programming techniques for developers.

Nov 25, 2023 · Applies the visitor vis to the object contained in arg. Equivalent to std::visit(std::forward<Visitor>(vis), value), where value is the std::variant stored in arg. Parameters …

May 19, 2025 · The visit functions do not modify the basic_format_arg object on which it is called because a copy of the object is used when calling vis. 1) Equivalent to …

May 1, 2025 · std::get(std::variant) called with an index or type that does not match the currently active alternative. std::visit called to visit a variant that is valueless_by_exception.

Feb 19, 2025 · An instance of variant at any given time either holds a value of one of its alternative types, or in the case of error - no value (this state is hard to achieve, see ...

Nov 10, 2020 · Provides compile-time indexed access to the types of the alternatives of the possibly cv-qualified variant, combining cv-qualifications of the variant (if any) with the cv-qualifications of the …