A generic solution (cont'd)

 1   typedef VALUE (*RUBY_VALUE_FUNC)(VALUE);
 2   VALUE rb_cpp_protect(RUBY_VALUE_FUNC f, VALUE arg) {
 3     int state = 0;
 4     VALUE retval = rb_protect(f, arg, &state);
 5     if(state != 0) {
 6       throw Ruby_Jump_Tag(state);
 7     }
 8   }