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i have a very simple question...
i am using the SDL API which was written in C. i am using C++. my compiler supports the keyword nullptr, and I've been reading up on it. it seems as if it is better to use rather than using the NULL macro.
when I call SDL_SetVideoMode, I assume it returns NULL on failure, so if i do:
SDL_Surface *test = nullptr;
if ((test = SDL_SetVideoMode(params)) == nullptr)
{
// to-do code
}
will this accurately check if my optimization on the surface test was successful?
731
nullptr is a keyword that can be used at all places where NULL is expected. Like NULL, nullptr is implicitly convertible and comparable to any pointer type.
Instead of NULL , they use nullptr , a new keyword introduced in C++11. Like NULL , nullptr implicitly converts to T* for any type T . Unlike NULL , nullptr is not an integer so it cannot call the wrong overload. Unlike NULL , nullptr has its own type, nullptr_t , so the compiler makes correct type deductions.
nullptr vs NULL NULL is 0(zero) i.e. integer constant zero with C-style typecast to void*, while nullptr is prvalue of type nullptr_t which is integer literal evaluates to zero.
In C, two null pointers of any type are guaranteed to compare equal. The preprocessor macro NULL is defined as an implementation-defined null pointer constant, which in C99 can be portably expressed as ((void *)0) which means that the integer value 0 converted to the type void* (pointer to void).
Yes. nullptr is comparable to and equivalent to a null pointer of any other pointer type.
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