Re: [Boost-users] How to sort a vector of tuples

From: Kevin Heifner (heifner_k_at_[hidden])
Date: 2005-11-26 00:31:49

Sumanth,

Comparison operators are defined in tuple_comparison.hpp

Sumanth J.V wrote:
> #include "boost/tuple/tuple_io.hpp"

// add this line
#include "boost/tuple/tuple_comparison.hpp"

> #include <vector>
> #include <algorithm>
> 
> typedef boost::tuple<unsigned long int, unsigned long int, double, 
> unsigned long int> Task;
> typedef std::vector<Task> TaskSet;
> 

// remove these
// bool operator<(const Task& a, const Task& b) {
//         return boost::get<1>(a) < boost::get<1>(b);
// }

> 
> int main(int argc, char** argv) {
>         TaskSet ts;
> 
>         ts.push_back( boost::make_tuple(0, 0, 0, 0) );
>         ts.push_back( boost::make_tuple(3, 3, 3, 3) );
>         ts.push_back( boost::make_tuple(2, 2, 2, 2) );
> 
>         std::sort(ts.begin(), ts.end());
> 
>         return 0;
> }

KevinH
-- 
Kevin Heifner  heifner @ ociweb.com  http://heifner.blogspot.com
           Object Computing, Inc. (OCI) www.ociweb.com