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C > *

Name: Anonymous 2008-05-15 5:55

#include <stdio.h>
#include <stdlib.h>

typedef int(*intfunc_t)(int);

typedef struct {
 intfunc_t call;
 intfunc_t first;
 intfunc_t second;
} composed_func;

void compose(intfunc_t a, intfunc_t b, composed_func *ret){
 ret->first = a;
 ret->second = b;
 int f(int n){
  return((*(ret->first))((*(ret->second))(n)));
 }
 ret->call = &f;
}

int main(){
 int n = arc4random() % 64;
 int f(int n){
  return n << 1;
 }
 printf("f(%d) = %d\n", n, f(n));
 printf("f(f(%d)) = %d\n", n, f(f(n)));
 composed_func c;
 compose(f, f, &c);
 printf("compose(f,f)(%d) = %d\n", n, c.call(n));
 return 0;
}

Name: Anonymous 2008-05-15 12:20

>>19
C can't, but you can get pretty damn close in C++

#include <iostream>

struct IFoo {
    virtual int func() = 0;
};

struct Bar {
    IFoo* make_ifoo() {
        struct Foo : IFoo {
            virtual int func() {
                return 42;
            }
        };
        return new Foo();
    }
};

int main( int argc, char *argv[] ) {
    Bar b; std::cout << b.make_ifoo()->func() << std::endl;
    return 0;
}

hur hur hurrr.
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