static void fn1(int* x, int* y);
static void fn2(int* x, int* y, int* z);
static void fn3(char* x, double y);
...

static void executeAlgorithm(
    vector<FN_PTR_TYPE> functionToExecute,
    map<FN_PTR_TYPE, FN_ARG_COLLECTION> args)
{
    // for each function in 'functionToExecute',
    // get the appropriate arguments, and call the
    // function using those arguments
}