Using Yasper

Using yasper

Examples

Initializing yasper pointers

#include "yasper.h"
using yasper::ptr;
 
struct SomeClass 
{
	SomeClass() : x(0) {}
	int x;  
	int f() { return x; }
}; 
int main(int argc, char* argv[])
{
	//preferred
	ptr<SomeClass> p1(new SomeClass);

	//less safe
	ptr<SomeClass> p2 = new SomeClass;

	//unsafe but still allowed
	SomeClass* raw = new SomeClass; 
	ptr<SomeClass> p3(raw); 
	
	return 0; 
	
	/*
		when program quits p1, p2, p3 all delete 
		objects they point to
	*/ 
	

}

Once you've created a smart pointer, use it as you would a regular C++ pointer. Access data members and methods with the dereferencing operator:

//access data member x
cout << endl << p1->x;

//call SomeClass::f
cout << endl << p1->f(); 

You can check if a ptr is valid either by calling ptr::IsValid() or allowing the pointer to implicitly convert to a boolean.

//this works
if (p1.IsValid()) cout << "Pointer is valid!"; 

//this also works
if (p1) cout << "Pointer is still valid!"; 

Yasper allows for some dangerous features, so watch out and don't use them unintentionally:

long num = &someObject; 

//assignment to long int allowed!
p1 = num; 


/*
 Setting pointer to 0 releases it.
 Upon release, the object p1 points to will be deleted,
 p1 will become invalid
*/ 

p1 = 0; 

//this will not print
if (p1) cout << "Still valid!"; 

//this will print
if (!p1) cout << "Null pointer!"; 