const int* const int * const int const *
What's the difference between these three?
c++ const declaration pointer
The const position can be written as follows:
If you twist it a lot, you can use it like this
I'll explain it together in the example
int number = 3;
int anotherNumber = 4;
const int constNumber = 5;
int* ptr0 = &number;
*ptr0 = 4; // Possible
ptr0 = &anotherNumber; // possible
ptr0 = &constNumber;//int* cannot point to constant
constint* ptr1 = & number; // possible
*ptr1 = 5; //ptr1 is pointing to constant, not possible
ptr1 = &anotherNumber; // possible
ptr1 = &constNumber;// Possible
int *const ptr2; // impossible. Const pointer must be initialized at the same time as declaration
int *const ptr3 = & number; // possible
*ptr3 = 6; // possible
Cannot change pointing target because ptr3 = &anotherNumber; //impossible const pointer
For more information, see Clockwise/Spiral Rule
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