Pointer Arithmetic - Page 3

Pointers to members are one of the most intricate syntactic constructs in C++, and yet, they are a very powerful feature too. In future tips, I will discuss pointers to members in further detail and ...

Most C++ users already know that they shouldn't use auto_ptr objects as elements of STL containers. However, fewer users know exactly why this is so. ...

I have two questions. How do I pass an array of objects as an argument? How do I fix an error like "do or while loops are not expanded inline"?

You can take the addresses of a class's static and non-static member functions. However, the class's constructor(s) and destructor are an exception to the rule. You cannot take their addresses nor ...

You can declare a reference to a function, just like you can declare a pointer to a function. For ...

In C, algorithms that rely on pointers such as bsearch() and lfind() return a null pointer to indicate that the sought after element wasn't found. Unlike a pointer, a reference must always be bound ...

What exactly is an opaque pointer?

Let's say I have a class foo, with a lot of functions that take no arguments and return SomeType: SomeType foo::bar() SomeType foo::quux() SomeType foo::quuux() SomeType foo::quuuux() Now I have a pointer to this type of funct : SomeType (foo::*pfn)(); Now comes the tough part, I want to return it: ?????? SomeFnct() { SomeType (foo::*pfn)(); pfn = foo::quux; return pfn; } What do I write instead of the ??????

C and C++ define a special type for pointer arithmetic, namely ptrdiff_t, which is a typedef of a platform-specific signed integral type. You can use a variable of type ptrdiff_t to store the result ...

Can you expalin the difference between the following statements in some examples and when do we need them: const char *ptr; // char *const ptr; //

Callback functions have a fixed signature so you cannot alter the number or type of the arguments it takes. For example, the standard qsort() function takes a pointer to a function that has the ...

A reader posted a message on one of the C++ newsgroups recently. He had to port a huge project from Borland C++ 5.0 to Visual C++ 6.0. The project uses the callback mechanism through pointers to ...

I am using Microsoft Visual C++ 6.0 and am trying to create a callback function pointer to the public member of a class, but I keep getting the following error: error C2664: 'callback' : cannot convert parameter 1 from 'void' to 'void (__cdecl *)(void)' Here is the code I am trying: #include class bb { public: void callback(void (*f)()); void callback2(); bb(); virtual ~bb(); }; bb::bb() { } bb::~bb() { } void bb::callback(void (*f)()) { f(); } void bb::callback2() { cout callback(tmp->callback2()); return 0; } TIA for any help.

Is it possible for a function to return an array instead of a single value?

In Standard C and C++, the address of the first element past the end of an array can be used in pointer arithmetic. Thus, you can initialize a vector with the contents of a built-in array, like ...

I was trying to do some direct memory stuff (writing to the DOS console buffer or a graphics screen) using my Visual C++ compiler. Unfortunately, the compiler is telling me that "far is an obsolete keyword." What is the solution to get to absolute memory addresses outside of the data segment? For example: char far * videobuffer = 0xA0000000;

Could you give me an exact definition of smart pointers, and how does a reference counting smart pointer work?

I am a beginner to C++ and have looked into several resources but still have some questions. Can you tell me what a void pointer is and what it is used for (implementation)? Also, what is the -