C++ Function pointers vs Switch
- by Perfix
What is faster: Function pointers or switch?
The switch statement would have around 30 cases, consisting of enumarated unsigned ints from 0 to 30.
I could do the following:
class myType
{
FunctionEnum func;
string argv[123];
int someOtherValue;
};
// In another file:
myType current;
// Iterate through a vector containing lots of myTypes
// ... for ( i=0; i < myVecSize; i ++ )
switch ( current.func )
{
case 1:
//...
break;
// ........
case 30:
// blah
break;
}
And go trough the switch with func every time. The good thing about switch would also be that my code is more organized than with 30 functions.
Or I could do that (not so sure with that):
class myType
{
myReturnType (*func);
string argv[123];
int someOtherValue;
};
I'd have 30 different functions then, at the beginning a pointer to one of them is assigned to myType.
What is probably faster: Switch statement or function pointer?
Calls per second: Around 10 million.
I can't just test it out - that would require me to rewrite the whole thing. Currently using switch.
I'm building an interpreter which I want to be faster than Python & Ruby - every clock cycle matters!
