C++ - Const

const.cpp

void Foo( int * ptr,
          int const * ptrToConst,
          int * const constPtr,
          int const * const constPtrToConst )
{
    *ptr = 0; // OK: modifies the "pointee" data
    ptr  = NULL; // OK: modifies the pointer
 
    *ptrToConst = 0; // Error! Cannot modify the "pointee" data
    ptrToConst  = NULL; // OK: modifies the pointer
 
    *constPtr = 0; // OK: modifies the "pointee" data
    constPtr  = NULL; // Error! Cannot modify the pointer
 
    *constPtrToConst = 0; // Error! Cannot modify the "pointee" data
    constPtrToConst  = NULL; // Error! Cannot modify the pointer
}

//http://cdecl.ridiculousfish.com/?q=char+*%28%26x%29%28int%2Culong%29%3B
//http://www.unixwiz.net/techtips/reading-cdecl.html