Mega Code Archive
Create your own unary function
<![CDATA[
#include <iostream>
#include <list>
#include <functional>
#include <algorithm>
using namespace std;
class reciprocal: unary_function<double, double> {
public:
result_type operator()(argument_type i)
{
return (result_type) 1.0/i;
}
};
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 reciprocal function object
p = transform(vals.begin(), vals.end(),
vals.begin(),
reciprocal()); // call function object
cout << "Transformed 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
Transformed contents of vals:
1 0.5 0.333333 0.25 0.2 0.166667 0.142857 0.125 0.111111
]]>