Mega Code Archive
Using a function object for operation counting, first version
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//Revised from
//STL Tutorial and Reference Guide C++ Programming with the Standard Template L
ibrary, 2nd Edition
//by David R. Musser (Author), Atul Saini (Author)
//# Publisher: Addison-Wesley Pub (Sd) (March 1996)
//# Language: English
//# ISBN-10: 0201633981
//# ISBN-13: 978-0201633986
#include <iostream>
#include <iomanip>
#include <cassert>
#include <vector>
#include <algorithm>
#include <functional>
using namespace std;
template <typename T>
class less_with_count : public binary_function<T, T, bool> {
public:
less_with_count() { }
bool operator()(const T& x, const T& y) {
++counter;
return x < y;
}
long report() const {return counter;}
static long counter;
};
template <typename T>
long less_with_count<T>::counter = 0;
int main()
{
const long N1 = 1000, N2 = 128000;
for (long N = N1; N <= N2; N *= 2) {
vector<int> vector1;
for (int k = 0; k < N; ++k)
vector1.push_back(k);
random_shuffle(vector1.begin(), vector1.end());
less_with_count<int> comp_counter;
less_with_count<int>::counter = 0;
sort(vector1.begin(), vector1.end(), comp_counter);
cout << comp_counter.report() << endl;
}
return 0;
}
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