[PartialCloning]

I see a lot of values set to "NULL" ("SetTouch(NULL);", "m_pGoalEnt = NULL;") in the game's code.

What is NULL equal to?

[klippy]

Equal to 0. Mostly used as a null pointer (C++ has typesafe nullptr for this).

[CrazY.]

No, 0 don't is equal null. 0 is a integer number, null is nothing.

if ($test == null) // equal nothing

if ($test == 0) // equal integer

if (0 == null) // bool false

[SpawnerF]

Originally Posted by CrazY. No, 0 don't is equal null. 0 is a integer number, null is nothing. if ($test == null) // equal nothing if ($test == 0) // equal integer if (0 == null) // bool false

He was talking about c++

KliPPy is right it's defined like that

#define NULL 0

Edit: ( Read also this )

Spoiler

Should I use NULL or 0?

In C++, the definition of NULL is 0, so there is only an aesthetic difference. I prefer to avoid macros, so I use 0. Another problem with NULL is that people sometimes mistakenly believe that it is different from 0 and/or not an integer. In pre-standard code, NULL was/is sometimes defined to something unsuitable and therefore had/has to be avoided. That's less common these days. If you have to name the null pointer, call it nullptr; that's what it's going to be called in C++0x. Then, "nullptr" will be a keyword.

[CrazY.]

Oh, if he's referring to a language and not in general, all right. But it's worth pointing out even so not all languages that identify zero as a null. Anyway... the question is about C++ only, so my topic is off.

[fysiks]

Originally Posted by CrazY. No, 0 don't is equal null. 0 is a integer number, null is nothing. if ($test == null) // equal nothing if ($test == 0) // equal integer if (0 == null) // bool false

This is only (and often) true in languages that have dynamically typed variables, variables that can be any type and don't need to be defined as a specific type (e.g. Python, PHP, etc.). In my experience, these are also OO languages.

[CrazY.]

Exactly that, with is quote I was referencing the PHP.

[fysiks]

Originally Posted by CrazY. Exactly that, with is quote I was referencing the PHP.

Because clearly this is a PHP forum.

[CrazY.]

Hmm? Why you say that?