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6.50 Function Names as Strings ΒΆ

GCC provides three magic constants that hold the name of the current function as a string. In C++11 and later modes, all three are treated as constant expressions and can be used in constexpr constexts. The first of these constants is __func__, which is part of the C99 standard:

The identifier __func__ is implicitly declared by the translator as if, immediately following the opening brace of each function definition, the declaration 

static const char __func__[] = "function-name";
-

appeared, where function-name is the name of the lexically-enclosing function. This name is the unadorned name of the function. As an extension, at file (or, in C++, namespace scope), __func__ evaluates to the empty string.

__FUNCTION__ is another name for __func__, provided for backward compatibility with old versions of GCC.

In C, __PRETTY_FUNCTION__ is yet another name for __func__, except that at file scope (or, in C++, namespace scope), it evaluates to the string "top level". In addition, in C++, __PRETTY_FUNCTION__ contains the signature of the function as well as its bare name. For example, this program: 

extern "C" int printf (const char *, ...);
-
-class a {
- public:
-  void sub (int i)
-    {
-      printf ("__FUNCTION__ = %s\n", __FUNCTION__);
-      printf ("__PRETTY_FUNCTION__ = %s\n", __PRETTY_FUNCTION__);
-    }
-};
-
-int
-main (void)
-{
-  a ax;
-  ax.sub (0);
-  return 0;
-}
-

gives this output: 

__FUNCTION__ = sub
-__PRETTY_FUNCTION__ = void a::sub(int)
-

These identifiers are variables, not preprocessor macros, and may not be used to initialize char arrays or be concatenated with string literals.

Next: Getting the Return or Frame Address of a Function, Previous: Incomplete enum Types, Up: Extensions to the C Language Family [Contents][Index]

-

- © Free Software Foundation
Licensed under the GNU Free Documentation License, Version 1.3.
- https://gcc.gnu.org/onlinedocs/gcc-13.1.0/gcc/Function-Names.html -

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