What are the Differences Between `__PRETTY_FUNCTION__`, `__FUNCTION__`, and `__func__`?

Navigating the Differences Between PRETTY_FUNCTION__, __FUNCTION__, and __func

In the realm of coding, it's crucial to understand the distinction between three identifiers: __PRETTY_FUNCTION__, __FUNCTION__, and __func__. Each holds its unique attributes and documentation, influencing our choice depending on the desired outcome.

Diving into func

Introduced in C99, func offers a straightforward solution for accessing the current function's name within the function's scope. It expands to a character array containing the unadorned function name. This identifier has gained traction in C as well, being added in C 11 with a slightly different definition: "an implementation-defined string."

Exploring FUNCTION

Certain C compilers support FUNCTION as a pre-standard extension, but relying solely on it is not advisable. For compilers lacking func support, FUNCTION can serve as a substitute, albeit with limitations compared to its standardized counterpart.

Enter PRETTY_FUNCTION

__PRETTY_FUNCTION__, an extension specific to gcc, operates similarly to __FUNCTION__. However, in the context of C functions, it presents an enhanced version of the function name, complete with the function signature. Visual C offers a comparable alternative in __FUNCSIG__, with subtle differences.

Documentation and Availability

For the non-standard macros, it's prudent to refer to the respective compiler documentation. Visual C extensions are well-documented in MSDN under "Predefined Macros" for the C compiler, while gcc extensions are covered in the documentation page "Function Names as Strings."

Choosing the Right Identifier

Selecting the appropriate identifier depends on the desired outcome and compiler support.

• __func__: Use this for standardized access to the unadorned function name in C99 and later.
• __FUNCTION__: Consider using this when func is unavailable, but be aware of its limitations.
• __PRETTY_FUNCTION__: Opt for this if you need the "pretty" function name with the signature in C code, particularly with gcc.

By understanding the nuances of these identifiers, you can harness their power effectively to obtain the function-related information you require in your coding endeavors.

The above is the detailed content of What are the Differences Between `__PRETTY_FUNCTION__`, `__FUNCTION__`, and `__func__`?. For more information, please follow other related articles on the PHP Chinese website!