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NEGATOR.CPP
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C/C++ Source or Header
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1997-05-06
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1KB
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43 lines
#include<functional>
#include<algorithm>
using namespace std;
//
// Create a new predicate from unary_function.
//
template<class Arg>
class is_odd : public unary_function<Arg, bool>
{
public:
bool operator() (const Arg& arg1) const
{
return (arg1 % 2 ? true : false);
}
};
int main ()
{
less<int> less_func;
//
// Use not2 on less.
//
cout << (less_func(1,4) ? "TRUE" : "FALSE") << endl;
cout << (less_func(4,1) ? "TRUE" : "FALSE") << endl;
cout << (not2(less<int>())(1,4) ? "TRUE" : "FALSE") << endl;
cout << (not2(less<int>())(4,1) ? "TRUE" : "FALSE") << endl;
//
// Create an instance of our predicate.
//
is_odd<int> odd;
//
// Use not1 on our user defined predicate.
//
cout << (odd(1) ? "TRUE" : "FALSE") << endl;
cout << (odd(4) ? "TRUE" : "FALSE") << endl;
cout << (not1(odd)(1) ? "TRUE" : "FALSE") << endl;
cout << (not1(odd)(4) ? "TRUE" : "FALSE") << endl;
return 0;
}