std::any
From cppreference.com
| Defined in header
<any>
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| class any;
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(since C++17) | |
The class any describes a type-safe container for single values of any type.
1) An object of class
any stores an instance of any type that satisfies the constructor requirements or is empty, and this is referred to as the state of the class any object. The stored instance is called the contained object. Two states are equivalent if they are either both empty or if both are not empty and if the contained objects are equivalent.
2) The non-member
any_cast functions provide type-safe access to the contained object.Implementations are encouraged to avoid dynamic allocations for small objects, but such an optimization may only be applied to types that for which std::is_nothrow_move_constructible returns true.
Contents |
[edit] Member functions
constructs an any object (public member function) |
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assigns an any object (public member function) |
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destroys an any object (public member function) |
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Modifers |
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| destroys contained object (public member function) |
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swaps two any objects (public member function) |
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Observers |
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| checks if object holds a value (public member function) |
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returns the typeid of the contained value (public member function) |
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[edit] Non-member functions
| (C++17)
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specializes the std::swap algorithm (function) |
| (C++17)
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type-safe access to the contained object (function template) |
[edit] Helper classes
| (C++17)
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exception thrown by the value-returning forms of any_cast on a type mismatch (class) |