Std any cast C API Reference Document API
4 5 If operand is not a null pointer and the typeid of the reed T matches that of the contents of operand a pointer to the value contained by operand otherwise a null pointer
Std any cppreference, Non member functions std any Helper classes bad any cast edit Defined in header any since C 17 The class any describes a type safe container for single values of any copy constructible 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
Explicit type conversion cppreference
Converts between types using a combination of explicit and implicit conversions it cannot be compiled If there is exactly one expression in parentheses this cast expression is exactly equivalent to the corresponding C style cast expression a prvalue otherwise In the case of an ambiguity between an expression statement with a function
Std any any cppreference, 2 3 or moves content of into a new instance so that any content is equivalent in both type and value to those of prior to the constructor call or empty if is empty Formally 2 If other is empty the constructed object is empty Otherwise equivalent to any std in place type T std any cast const considering that object as an rvalue
Std bad any cast cppreference
Std bad any cast cppreference, Std bad any cast since C 17 Returns the explanatory string Pointer to a null terminated string with explanatory information The string is suitable for conversion and display as a std wstring The pointer is guaranteed to be valid at least until the exception object from which it is obtained is destroyed or until a non const member
Defective Any Cast YouTube
How do I support any cast to cast a custom class to a string
How do I support any cast to cast a custom class to a string 1 Answer The example given for any cast at cppreference shows that casting an int to a std string results in bad any cast exception being thrown The result will be the same if any cast is used to convert wstr to std string And BTW std any wstr myAny does not work since std any is a class and not a template
GitHub Chshzhe CppReference 2021 2022 CS1501
C is statically typed Every expression after template instantiation has a type fixed at compile time You therefore can t work with std any without knowledge of the type it potentially holds You can obtain the type and the value that std any holds using any cast or the std type info returned by type through the other members it It is possible to efficiently cast std any with std any cast. If a pointer to object is cast to pointer to any character type the result points at the lowest byte of the object and may be incremented up to sizeof the target type in other words can be used to examine object representation or to make a copy via memcpy or memmove Any pointer to function can be cast to a pointer to any other function Rel ops operator rel ops operator rel ops operator rel ops operator
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