Uses of the ptrdiff_t Data Type

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 of subtracting and adding pointers. For example:

 #include int main(){  int buff[4];  ptrdiff_t diff = (&buff[3]) - buff; // diff = 3  diff = buff -(&buff[3]); //  -3}

What are the advantages of using ptrdiff_t? First, the name ptrdiff_t is self-documenting and helps the reader understand that the variable is used in pointer arithmetic exclusively. Secondly, ptrdiff_t is portable: its underlying type may vary across platforms, but you don’t need to make changes in the code when porting it.

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