How to distinguish if a function pointer in C points to function 1 or function 2 -

How to distinguish if a function pointer in C points to function 1 or function 2 -

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is safe pass function pointers around , compare them normal object's pointers? 6 answers

i have 2 functions

void foo1(int); void foo2(int);

i.e. both have same signature. have function pointer

typedef void (*func_pt)(int)

that can point either foo1 or foo2 e.g.

if (match_condition) { func_pt = foo1; } else { func_pt = foo2; }

later in code, need find out if func_pt pointing foo1 or foo2.

this code if (func_pt == foo1) seems work.

is recommended , safe? if not, there alternative findng out function function pointer point to?

i don't understand how c compiler can figure out equality. when compiler sees foo1, finds address of code function instructions stored?

thanks answers

yes, safe. [6.5.9] of c99 standard (emphasis mine):

two pointers compare equal if , if both null pointers, both pointers same object (including pointer object , subobject @ beginning) or function, both pointers 1 past lastly element of same array object, or 1 pointer 1 past end of 1 array object , other pointer start of different array object happens follow first array object in address space.

c function-pointers