OpenForum RSS: template class predicate

template class predicate (elvenic)

Sun, 20 May 2012 04:40:51 GMT

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[code]
#include <iostream>

typedef int (*MyFunPtrType)(int);

template<MyFunPtrType fptrParam>
class A
{
int x;
MyFunPtrType fptr;
public:
A() : fptr(fptrParam) { x = fptr(2);}
int getX() { return x; }
};

int intQuadruple(int i) { return 4 * i; };

int main(int argc, char *argv[])
{
A<intQuadruple> quadrupler;
std::cout << "quadrupler.getX(): [" << quadrupler.getX() << "]\n";
}
[/code]

�� :

[code]
quadrupler.getX(): [8]
[/code]

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template class predicate (handler2006)

Sun, 20 May 2012 03:02:37 GMT

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template class predicate (elvenic)

Sat, 19 May 2012 21:40:01 GMT

[code]
#include <iostream>

struct IntSquarer { int operator()(int i) {return i*i;} };
struct IntTripler { int operator()(int i) { return (3 * i); } };

template<typename Functor>
class A
{
int x;
Functor funct;
public:
A() { x = funct(2);}
int getX() { return x; }
};

int main(int argc, char *argv[])
{
A<IntSquarer> squarer;
std::cout << "squarer.getX(): [" << squarer.getX() << "]\n";

A<IntTripler> tripler;
std::cout << "tripler.getX(): [" << tripler.getX() << "]\n";

}

[/code]

�� :

[code]
squarer.getX(): [4]
tripler.getX(): [6]
[/code]

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