How Not to Program in C++

244 Part III

ch = in_file.get();

serial_out.put(ch);

}

serial_out.fflush();

Answer 66: The

setjmp

marks a location in the code. The

longjmp

call jumps to it.

It jumps directly to it, it does not pass go, it does not collect $200. It also

skips all the destructors for all the variables on the stack. In this case,

because the destructor for

std::string

returns the memory allocated for the

string, we have a memory leak.

That’s because the

setjmp

and

longjmp

functions are C functions that should

not be used in C++.

Avoidance 21: Do not use

setjmp

and

longjmp

in a C++ program. Use exceptions

instead.

Answer 67: In the default case:

defualt:

std::cout << i << " is not prime\n";

break;

The “default” keyword is misspelled. The result is that the C++ comp ...