Question

I’m so sick of the pass-callback-data-as-void*-struct anti-pattern. Boost bind solves it nicely, but is an unacceptable dependency. What’s a lightweight alternative? How would I write it myself as simply as possible?

Answer 1

I’m not familiar with boost:bind, but is it something like this?

#include <iostream>  void foo (int const& x) {     std::cout << 'x = ' << x << std::endl; }  void bar (std::string const& s) {     std::cout << 's = ' << s << std::endl; }  template<class T> void relay (void (*f)(T const&), T const& a) {     f(a); }  int main (int argc, char *argv[]) {     std::string msg('Hello World!');     relay (foo, 1138);     relay (bar, msg); } 

Output —

x = 1138 s = Hello World!