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Tip Bank > C++ > Pointer Arithmetic

Pointer Arithmetic - Page 3

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Introducing Pointers to Members
by Danny Kalev
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 ...
Why you shouldn't store auto_ptr objects in STL containers
by Danny Kalev
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. ...
Array of Objects
by DevX Pro
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"?
Accessing the Addresses of Class's Member Functions
by Danny Kalev
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 ...
Declaring References to Functions
by Danny Kalev
You can declare a reference to a function, just like you can declare a pointer to a function. For ...
Living Without Null References
by Danny Kalev
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 ...
Opaque Pointer
by DevX Pro
What exactly is an opaque pointer?
Returning a Pointer to a Member Function
by DevX Pro
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 ??????
Uses of the ptrdiff_t Data Type
by Danny Kalev
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 ...
Constant Pointer
by DevX Pro
Can you expalin the difference between the following statements in some examples and when do we need them: const char *ptr; // char *const ptr; //
Passing More Arguments to a Callback Function
by Danny Kalev
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 ...
Never Use Incompatible Pointers to Member Functions
by Danny Kalev
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 ...
Creating a Callback Function Pointer
by DevX Pro
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.
Functions Returning Arrays
by DevX Pro
Is it possible for a function to return an array instead of a single value?
Constraints on Pointer Arithmetic Past an Array's End
by Danny Kalev
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 ...
Far pointers in VC 5-6.0
by DevX Pro
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;
Smart Pointer
by DevX Pro
Could you give me an exact definition of smart pointers, and how does a reference counting smart pointer work?
Void Pointer and -> Operator
by DevX Pro
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 -&#gt; operator?
Declaring Variables Inside an If-Condition
by Danny Kalev
C++ allows you to declare variables just before their use rather than at the top of the enclosing block. Thus, it is legal to declare a variable inside the condition of an ...
When Are Pointers Equal?
by Danny Kalev
Pointers to objects or functions of the same type are equal if and only if in they are both ...
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