How to make a pair structure

[mitmaxtor]

Hi everyone,
I am working on to implement Matlab sort function in C++ and I used
the following code. But, it seems it does not work for me. Any idea
about how to modify the code or any idea to make it work? thanks a lot

#include <vector>
#include <map>
#include <boost/bind.hpp>
#include <boost/iterator/counting_iterator.hpp>
#include <algorithm>

void main()
{
using std::vector;
typedef std:air<double,int> dpair; // <data,index>
vector<int> data;
vector<dpair> A;

std::transform(&A[0], &A[2]
, boost::counting_iterator<int>(1)
, std::inserter(A,data.begin())
, boost::bind(std::make_pair<double,int>, _1, _2)
);

}

 

[Kai-Uwe Bux]

Hi everyone,
I am working on to implement Matlab sort function in C++ and I used
the following code. But, it seems it does not work for me. Any idea
about how to modify the code or any idea to make it work?

That would require us to know what the code is supposed to accomplish.

thanks a lot

#include <vector>
#include <map>
#include <boost/bind.hpp>
#include <boost/iterator/counting_iterator.hpp>
#include <algorithm>

void main()

int main ()

{
using std::vector;
typedef std:air<double,int> dpair; // <data,index>
vector<int> data;
vector<dpair> A;

This vector A is empty.

std::transform(&A[0], &A[2]

Neither A[0] nor A[2] exist. You have undefined behavior.

, boost::counting_iterator<int>(1)
, std::inserter(A,data.begin())
, boost::bind(std::make_pair<double,int>, _1, _2)
);

}

Best

Kai-Uwe Bux

 

[Joel Yliluoma]

Hi everyone,
I am working on to implement Matlab sort function in C++ and I used
the following code. But, it seems it does not work for me. Any idea
about how to modify the code or any idea to make it work? thanks a lot

#include <vector>
#include <map>
#include <boost/bind.hpp>
#include <boost/iterator/counting_iterator.hpp>
#include <algorithm>

void main()
{
using std::vector;
typedef std:air<double,int> dpair; // <data,index>
vector<int> data;
vector<dpair> A;

std::transform(&A[0], &A[2]
, boost::counting_iterator<int>(1)
, std::inserter(A,data.begin())
, boost::bind(std::make_pair<double,int>, _1, _2)
);
}

A couple of issues.

1. main() should return an int, not a void. As such, your code
contains undefined behavior and cannot be expected to work.
2. What does "Matlab sort function" do? Such knowledge is crucial
for understanding how your code is supposed to work and how it
does not work.
3. What do boost::counting_iterator and boost::bind do? These
are relevant to libboost, not the C++ language itself. As such,
your code is off-topic in this group, comp.lang.c++ .