Re: compilation error with merge algorithm

Consider the following program:

#include <cstdlib>
#include <iostream>
#include <set>
#include <map>
#include <algorithm>
#include <iterator>
#include <utility>

using namespace std;

int main()
{
        typedef pair<int, int> p_type;

        multiset<p_type> c1;

        c1.insert(make_pair(0, 2));
        c1.insert(make_pair(0, 0));
        c1.insert(make_pair(0, 1));
        c1.insert(make_pair(2, 3));

        multimap<int, int> c3;

        c3.insert(make_pair(5, 0));
        c3.insert(make_pair(0, 0));
        c3.insert(make_pair(3, 2));
        c3.insert(make_pair(0, -1));
        c3.insert(make_pair(1, -1));

        multimap<int, int> dest;

        merge(c1.begin(), c1.end(), c3.begin(), c3.end(),
inserter(dest, dest.begin()));

        return EXIT_SUCCESS;
}

Suppose the above program is named z.cpp and is compiled as
g++ -std=c++98 -pedantic -Wall -Wextra z.cpp

Then I get compilation error for the line
merge(...)

z.cpp:32: instantiated from here
/usr/lib/gcc/i386-redhat-linux/3.4.3/../../../../include/c++/3.4.3/
bits/stl_algo.h:2979: error: no match for 'operator<' in '(&__first2)-


int, int>]() < (&__first1)-


main()::p_type]()'

Kindly help me to fix this compilation error.