Realloc Invalid Pointer in C
you said ‘I copy the pointer to this array into another variable’. The problem is as soon as you do a realloc, the original pointer is no longer valid. I dont see the reason to copy the pointer to a variable?
pointers
Warning: comparison of distinct pointer types
First, myArray == &myArray == &myArray[0] is not going to do what you expect. Second, &myArray is of type int (*)[10] while myArray and &myArray[0] are of type int *. Both types are incompatible with each other.
C++ correct way to return pointer to array from function
Your code as it stands is correct but I am having a hard time figuring out how it could/would be used in a real world scenario. With that said, please be aware of a few caveats when returning pointers from functions: When you create an array with syntax int arr[5];, it’s allocated on the stack … Read more
Difference between char* and char** (in C)
char* is a pointer to char, char ** is a pointer to a pointer to char. char *ptr; does NOT allocate memory for characters, it allocates memory for a pointer to char. char arr[10]; allocates 10 characters and arr holds the address of the first character. (though arr is NOT a pointer (not char *) … Read more
Difference between char *argv[] and char **argv for the second argument to main()
CODE 1 CODE 2 CODE 1 and CODE 2 both give same output. but argument 2 of main function in CODE 1 and CODE 2 are different. Array of pointers are created above data section at compile time. argv is array of pointers. Then we should declare argument in main function as pointer to pointer … Read more
typedef struct pointer definition
You cannot use pEDGE within the definition of the struct. You shoud do something like: You must also note that edge_item is a double pointer. You also mention that in your question. So if you use pEDGE_ITEM and you just want to have a normal pointer you should not write pEDGE_ITEM *edge_item but just pEDGE_ITEM … Read more
What does `dword ptr` mean?
The dword ptr part is called a size directive. This page explains them, but it wasn’t possible to direct-link to the correct section. Basically, it means “the size of the target operand is 32 bits”, so this will bitwise-AND the 32-bit value at the address computed by taking the contents of the ebp register and … Read more
Function stoi not declared
std::stoi was introduced in C++11. Make sure your compiler settings are correct and/or your compiler supports C++11.
Why should I use a pointer rather than the object itself?
It’s very unfortunate that you see dynamic allocation so often. That just shows how many bad C++ programmers there are. In a sense, you have two questions bundled up into one. The first is when should we use dynamic allocation (using new)? The second is when should we use pointers? The important take-home message is … Read more
C++ Array of pointers: delete or delete []?
delete[] monsters; Is incorrect because monsters isn’t a pointer to a dynamically allocated array, it is an array of pointers. As a class member it will be destroyed automatically when the class instance is destroyed. Your other implementation is the correct one as the pointers in the array do point to dynamically allocated Monster objects. … Read more