Syntax:

  template <class Operation, class T>
    binder1st<Operation> bind1st (const Operation& op, const T& x);

bind the first argument of the binary function.

For example:

#include <iostream>
using std::cout;
#include <algorithm>
using std::transform;
#include <functional>
using std::bind1st;
using std::plus;
 
int main(int argc, char **argv) {
  int a1[]={0,1,2,3,4,5};
  const size_t SIZE=sizeof(a1)/sizeof(*a1);
  transform(a1,a1+SIZE,a1,bind1st(plus<int>(),SIZE));
    for(size_t i=0;i<SIZE;i++){
      cout<<a1[i]<<" ";
    }
  return EXIT_SUCCESS;
}