Sorting Tuples in C++ 2


In this post, I would like to show how to create a tuple object in C++ 11 and how to sort tuples.

Here is the code for creating tuples and doing the sort. It is pretty straightforward.

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#include <iostream>
#include <string>
#include <vector>
#include <tuple>
#include <algorithm>
using namespace std;
 
typedef tuple<string,double,int> mytuple;
 
bool mycompare (const mytuple &lhs, const mytuple &rhs){
  return get<1>(lhs) < get<1>(rhs);
}
 
int main(void){
  vector<mytuple> data;
  data.push_back(make_tuple("abc",4.5,1));
  data.push_back(make_tuple("def",5.5,-1));
  data.push_back(make_tuple("wolf",-3.47,1));
  sort(data.begin(),data.end(),mycompare);
  for(vector<mytuple>::iterator iter = data.begin(); iter != data.end(); iter++){
    cout << get<0>(*iter) << "\t" << get<1>(*iter) << "\t" << get<2>(*iter) << endl;
  }
}

The code is successfully compiled by G++ 4.6.1 with the option “-std=gnu++0x”.


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