Consider below C program. The program has extra bracket around function name.
// C program to show that extra brackets with function // name work #include <stdio.h> void (foo)(int n) { printf("Function : %d ", n); } int main() { (foo)(4); return 0; } |
Output:
Function 4
So putting extra bracket with function name works in C/C++.
What can be use of it?
One use could be, if we have a macro with same name as function, then extra brackets avoid macro expansion wherever we want the function to be called.
// C program to show that extra brackets with function // name can be useful if we have a macro with same name #include <stdio.h> #define foo(n) printf("\nMacro : %d ", n); void (foo)(int n) { printf("Function : %d ", n); } int main() { (foo)(4); foo(4); return 0; } |
Output:
Function 4 Macro : 4
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