How Can You Retrieve Class Information in C ?

Retrieving Class Information in C : The CLASS Macro

In C , the CLASS macro provides a convenient way to retrieve the name of the current class, similar to how FUNCTION provides access to the function name.

CLASS Macro Implementation

However, it's important to note that CLASS is not an officially defined macro in the C standard. Instead, its implementation may vary depending on the compiler and platform.

One common implementation defined for gcc is PRETTY_FUNCTION macro that includes the class name along with the function name. Nonetheless, this macro is not standardized, and its behavior can vary across different compilers.

Alternative Solutions

In scenarios where portability across compilers is critical, typeid(*this).name() can be used to obtain the qualified class name, including namespaces. However, this method is only applicable when a valid this pointer exists, which may not be the case in static method calls.

Platform-Specific Macros

Some compilers may provide platform-specific macros for retrieving class information. For instance, Microsoft Visual Studio provides the __declspec(dllexport) and __declspec(dllimport) attributes, which can be used to extract the class name in a cross-platform manner.

Custom Macros for Class and Method Names

To achieve a more generic and portable approach, custom macros can be defined to extract class and method names from PRETTY_FUNCTION or typeid(*this).name():

#define __CLASS_NAME__ className(__PRETTY_FUNCTION__)
#define __METHOD_NAME__ methodName(__PRETTY_FUNCTION__)

These macros utilize helper functions to parse the necessary information from __PRETTY_FUNCTION__, ensuring compatibility across compilers and platforms.

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