nil, Nil, NULL, NSNull

Re:nil, Nil, NULL, NSNull by mpyne on Wednesday January 09, 2013 @10:14AM (#5031867)

If you think a C++ compiler has the option to define NULL as ((void * ) 0) then all I ask is that you simply try it yourself and let me know what compiler error you get. Make sure to turn off permissive flags.

    class Foo { };
    int main() {
        Foo *foo = malloc(sizeof(Foo)); // returns void*
    }

[ Parent | on HN ]

Re:nil, Nil, NULL, NSNull by cjensen on Wednesday January 09, 2013 @03:45PM (#5033400)

You are confusing the preprocessor #define named NULL with the null pointer. Your code example involves void pointers, which is yet a third thing.

[ Parent | on HN ]

Re:nil, Nil, NULL, NSNull by mpyne on Thursday January 10, 2013 @11:16AM (#5037729)

That's because NULL is the pre-processor define. The null pointer itself has no name in C or C++ (pre-11), except that the language will convert integer '0' into whatever the hardware's null pointer is (usually also 0) when converting integral types to pointer types. C++11 added a name and specific type for the null pointer but that's about it.

[ Parent | on HN ]