clubvilla.blogg.se - Double indirection in c

Double indirection in c how to#
Double indirection in c skin#
Double indirection in c 64 bits#
Double indirection in c code#
Double indirection in c windows#

Painting algorithms that require the intersection points of overlapping sprites to be rendered in a different manner.

A typical example is in a game environment where the collision between a spaceship and an asteroid is computed differently from the collision between a spaceship and a spacestation.

Adaptive collision algorithms usually require that collisions between different objects be handled in different ways.

Deciding if one element comes before another element requires knowledge of both types and possibly some subset of the fields.

Sorting a mixed set of objects: algorithms require that a list of objects be sorted into some canonical order.

For example, a programmer could use double dispatch in the following situations: Double dispatch is another solution that gradually reduces the polymorphism on systems that do not support multiple dispatch.ĭouble dispatch is useful in situations where the choice of computation depends on the runtime types of its arguments. To that end, systems like CLOS implement multiple dispatch.

Double indirection in c how to#

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Double indirection in c windows#

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Double indirection in c skin#

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But it's the result of 3 bugs cancelling out - the cast of arr, the increment of a **, and passing an int* to a %d in printf. It started off pointing to arr, and after incrementing it now points 32 bits along arr, which is why it returns the next value. Well, printf does not do any type checking.

Double indirection in c 64 bits#

And it's not true on my Linux 64-bit system - address 64 bits and int 32-bits. That's not true in Windows small memory model (addresses 16-bit and integer 32-bit). Now it happens on your system that an int* and an int are both 32 bits.

You then increment ptr++ this increments by the size of the object which ptr points to, that is sizeof (int *). Remember a cast does not change the bits copied - it just tells the compiler to accept the copy without arguing. You have told the compiler that ptr is to be treated as a pointer to a pointer to an int (which it is not), and to stop it warning you, you have also cast the value. When you assign to int **ptr = (int **) arr the value assigned is the address of the array. *(*(arr + 1) + 3) that's not too easy to read. To index by anything other than 0, you have to bracket the precedence. X and *(X + 2) are identical (so is *(2 + X) too). There is an address equivalence in C between indexing and address dereference. The compiler treats the name arr as the address of a 2-d array.

Double indirection in c code#

"Anyone who has never made a mistake has never tried anything is what is going on in your code sample. It takes a touch of genius - and a lot of courage - to move in

"Any intelligent fool can make things bigger, more complex, and more The address of the pointer so if you still want to access the 2D array Now coming back to the double pointer, the double pointer can only store So Multidimensional arrays are represented as the single dimension andĬomplete abstraction is provided by compiler to programmer All the elements in the above array are stored in the sequential memory Before I give any explanation let me give some information on the how the