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Pointer incrementing query


By : user3852460
Date : October 15 2020, 01:18 AM
it helps some times It is really a problem with the whole idea. You can't meaningfully use a pointer to "jump" from one variable to another by incrementing and decrementing it. It is a weird, ugly and meaningless hack, for which the language gives you no guarantees whatsoever.
Pointer arithmetic in C/C++ is only defined within an array. So, if you want something like that, instead of x and y declare an array of 2 ints
code :


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Why does incrementing a void pointer by 1 moves one byte ahead but it's 4 bytes for an integer pointer,8 for double?


By : Eddie Brady
Date : March 29 2020, 07:55 AM
it helps some times You can't do pointer arithmetic on a void pointer (because it doesn't make sense). Probably it's just that your compiler has an extension that allows pointer arithmetic to be performed on void pointers, and it's implemented like this. However, it is neither standard nor encouraged to be used.

Can I use cmpxchg16b to atomically copy a pointer to a pointer and an int, while simultaneously incrementing the int (at


By : Alan Preston
Date : March 29 2020, 07:55 AM
Hope this helps Consider using std::atomic. It will compile to a 128bit CAS if the target architecture offers it and is much cleaner, easier to use, and more platform independent than inline assembler.
Here is an example how you can use it to update the pointer and increment the counter atomically:
code :
std::atomic<MyThing>* target = ...;
MyThing oldValue = target->load();
MyThing newValue { newPointer, 0 };
do{
    newValue.counter = oldValue.counter+1;
while(target->compare_exchange_strong(oldValue,newValue))

How does the operator precendence of ++ vs -> work when incrementing incrementing a member int through a pointer?


By : user3286457
Date : March 29 2020, 07:55 AM
this will help http://en.cppreference.com/w/cpp/language/operator_precedence As u can see, the ++ operator what u used, a prefix operator and this have lower lever precedence than ->.
Suffix operator are same level than ->.

c: when using a pointer as input in a function incrementing the pointers value by using *pointer++ doesn't work


By : user5689505
Date : March 29 2020, 07:55 AM
I wish this help you While I was learning C (I am very new to it), I was playing around with pointers. Here you can see my code: ,
Now my question is why i can't say *i++
code :
*(i++);
int* temp = i;  // Store the old pointer in a temporary variable.
i++;            // Increment the pointer
*temp;          // Dereference the old pointer value, effectively a noop.

incrementing a pointer instead of incrementing an array an it's index


By : Kashif Ali Bhatti
Date : March 29 2020, 07:55 AM
Does that help Given an array int arr[5] = { 1, 2, 3, 4, 5 };
And you have a pointer ptr that points to the start of the array, generally ptr + i points to i places ahead in the array which will be equivalent to arr[i];.
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