You'll need custom logic with in-depth knowledge of the mapping. In many cases the idiom mentions by "kazinator" above will often work - but not always: #defi

You'll need custom logic with in-depth knowledge of the mapping. In many cases the idiom mentions by "kazinator" above will often work - but not always: #define ptrToInt(x) ( ((char )x) - ( (char )0 ) ); ... and even that may require local tweaking.