what every constructor should have

[*brammie*]

all of your classes should have this in their constructor...
i've been searching for a bug for 3 hours, and this solved it  (thanks to the debugger)

Code

GeSHi (cpp):
class Foo
{
    public:
    Foo();
}
 
Created by GeSHI 1.0.7.18

Code

GeSHi (cpp):
Foo::Foo()
{
    memset((void*)this,0,sizeof(Foo));
}
 
Created by GeSHI 1.0.7.18

[adeyblue]

Well, it'll probably work if the class contains only POD types. If it contains anything nontrivial like a non-POD class or derives from or is a virtual base class then all you've done is substituted one bug for another that may not manifest itself so readily. Don't be so lazy and initialize the contents to sane default values in the initialization list and you're golden no matter what type of class you have.

[myork]

all of your classes should have this in their constructor...

Code

GeSHi (cpp):
Foo::Foo()
{
    memset((void*)this,0,sizeof(Foo));
}
Created by GeSHI 1.0.7.18

Absolutely not.
You are running all over the memory without regard for its type.
What you should do is correctly initalize every member variable in every constructor. Preferably in the initializer list.

[myork]

i've been searching for a bug for 3 hours, and this solved it  (thanks to the debugger)

It does not look like you solved the problem. Just covered up the problem.
What happens when you suddenly decide that Foo must now inherit from a base class. BOOOOOOM

[charlie]

Oops!

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You've got to be careful about solutions that appear to solve the immediate problem. Sometimes the only way to know its wrong is by asking around and learning from experience.

[*brammie*]

umm.. ok
(thought i had finally found something useful )

[charlie]

(thought i had finally found something useful )

Don't worry about it. You did! Now you know to pay attention to type and be careful of those C functions when working with C++ classes.