Hi,
Chris 'Xenon' Hanson wrote:
I'm also looking for a STL expert who knows for_each, mem_fun and
bin1st better than I to tell me what I'm doing wrong on a piece of
GDAL code related to VPB. But that's a different issue. Anyone who
wants to point out my mistake, contact me privately and I'll send you
the code snippet that is eluding me.
I'm no expert, but what I do know is that tr1::function and tr1::bind
are much easier to understand than the original variants. I've once made
a little test app for myself that I attach.
jp
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#include <iostream>
#include <cmath>
#include <boost/tr1/functional.hpp>
//#include <functional>
using namespace std;
class simple {
public:
int clfunc(int a, int b) {
return a*b;
}
};
// Make a function object that takes two ints and returns an int
typedef std::tr1::function <int (int, int)> jpcallback;
int test1(int a, int b)
{
return a+b;
}
int main(void)
{
simple mysim;
jpcallback cb1 = &test1;
// make a function from the member function and use param 1 and 2.
// bind allows one to make functions from other functions and allows swizzling of parameters
// or even leaving out or adding paramters
jpcallback cb2 = std::tr1::bind(std::tr1::mem_fn(&simple::clfunc), &mysim, _1, _2);
std::cout << cb1(5,2) << "\n";
std::cout << cb2(5,2) << "\n";
}
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