assert and NDEBUG

//check later code won't crash the system
  if( buf.length() % 2 )
    return false;
  // do other stuff that shouldn't affect bufs length
  //copy 2 bytes into buf at a time, if length is odd then don't know
  //what will happen so use assert to make sure it can't damage anything
  assert( !(buf.length() % 2) );
  for( i = 0; i != buf.length(); i += 2 )
    memcpy( buf + i, data, 2 );

/// ASSERT(condition) checks if the condition is met, and if not, calls
/// ABORT with an error message indicating the module and line where
/// the error occurred.
#ifndef ASSERT
#define ASSERT(x)
    if (!(x)) {
        char buf[2048];
        snprintf (buf, 2048, "Assertion failed in "%s", line %dn"
                 "tProbable bug in software.n",
                 __FILE__, __LINE__);
        ABORT (buf);
    }
    else   // This 'else' exists to catch the user's following semicolon
#endif


/// DASSERT(condition) is just like ASSERT, except that it only is
/// functional in DEBUG mode, but does nothing when in a non-DEBUG
/// (optimized, shipping) build.
#ifdef DEBUG
# define DASSERT(x) ASSERT(x)
#else
# define DASSERT(x) /* DASSERT does nothing when not debugging */
#endif

#undef NDEBUG