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If I have a vector of pairs

std::vector<std::pair<int, int> > vec;

is there and easy way to sort the list in increasing order based on the second element of the pair

struct sort_pred{

bool operator()(const pair(int, int) &left, const pair(int, int) &right){

return left.second > right.second;

}

sort(v.begin(), v.end(), sort_pred());

// temlate

template <class T1, class T2, class Pred = less<T1>() >

struct sort_pred{

bool operator()(const pair(T1, T2) &left, const pair(T1, T2) &right){

Pred p;

return p(left.second, right.second);

}

sort(v.begin(), v.end(), sort_pred<int, int>());

split a string in C++

#include <iostream>

#include <sstream>

#include <string>

using namespace std;

int main()

{

string s("Somewhere down the road");

istringstream iss(s);

{

string sub;

iss >> sub;

cout << "Substring: " << sub << endl;

} while (iss);

}

Sunbelt Computer Software