'operation' : different const or volatile qualifiers
The given operation was performed on a variable that was defined as being const or volatile. As a result, the const or volatile item could be modified without being detected by the compiler.
This error often occurs when a pointer to an item declared as const or volatile is assigned to a pointer that was not declared as pointing to either of these type modifiers.
The following is an example of this error:
const char *p = "abcde";
int str( char *s );
str( p ); // error