Tools.h++ Manual

104011 Tandem Computers Incorporated 14-7

The following is an example where they are not of the same type:

Here, a stack of (pointers to)

Foos

is declared and used, while the variable

being passed as the second argument to the tester function is still a

const

int*

. The tester function must take this into account.

#include <rw/gstack.h>

#include <rw/rstream.h>

class Foo {

public:

int data;

Foo(int i) {data = i;}

};

declare(RWGStack, Foo) // A stack of pointers to Foos

RWBoolean anotherTesterFunction(const Foo* fp, const void* a)

{

return fp->data == *(const int*)a;

}

main()

{

RWGStack(Foo) gs;

gs.push(new Foo(1));

gs.push(new Foo(2));

gs.push(new Foo(3));

gs.push(new Foo(4));

int aValue = 2;

if ( gs.contains(anotherTesterFunction, &aValue) )

cout << "Yup.\n";

else

cout << "Nope.\n";

return 0;

}