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negate
#include <iostream>
#include <list>
#include <functional>
#include <algorithm>
using namespace std;
int main()
{
list<double> vals;
for(int i=1; i<10; i++)
vals.push_back((double)i);
cout << "Original contents of vals:\n";
list<double>::iterator p = vals.begin();
while(p != vals.end()) {
cout << *p << " ";
p++;
}
cout << endl;
// use the negate function object
p = transform(vals.begin(), vals.end(),
vals.begin(),
negate<double>()); // call function object
cout << "Negated contents of vals:\n";
p = vals.begin();
while(p != vals.end()) {
cout << *p << " ";
p++;
}
return 0;
}Original contents of vals:
1 2 3 4 5 6 7 8 9
Negated contents of vals:
-1 -2 -3 -4 -5 -6 -7 -8 -9
