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// list::unique
#include <iostream>
#include <cmath>
#include <list>
// a binary predicate implemented as a function:
bool same_integral_part (double first, double second)
{ return ( int(first)==int(second) ); }
// a binary predicate implemented as a class:
struct is_near {
bool operator() (double first, double second)
{ return (fabs(first-second)<5.0); }
};
int main ()
{
double mydoubles[]={ 12.15, 2.72, 73.0, 12.77, 3.14,
12.77, 73.35, 72.25, 15.3, 72.25 };
std::list<double> mylist (mydoubles,mydoubles+10);
mylist.sort(); // 2.72, 3.14, 12.15, 12.77, 12.77,
// 15.3, 72.25, 72.25, 73.0, 73.35
mylist.unique(); // 2.72, 3.14, 12.15, 12.77
// 15.3, 72.25, 73.0, 73.35
mylist.unique (same_integral_part); // 2.72, 3.14, 12.15
// 15.3, 72.25, 73.0
mylist.unique (is_near()); // 2.72, 12.15, 72.25
std::cout << "mylist contains:";
for (std::list<double>::iterator it=mylist.begin(); it!=mylist.end(); ++it)
std::cout << ' ' << *it;
std::cout << '\n';
return 0;
}
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