Re: extending c++ classes and enumerations

Al <>
6 Dec 2006 02:08:10 -0500
Hi there!

alex wrote: wrote:



// File enum.h
enum ThreadState { ERROR = -1, RUNNING, TERMINATED };
extend enum ThreadState { CANCELED };

Not sure about extending classes, but enums... Let's add:

extend enum ThreadState { ANOTHER_STATE };

extend enum ThreadState { YET_ANOTHER_STATE };

And then the real value of ANOTHER_STATE will depend on the order of
header inclusions :)

This is an interesting enum proposal. But, what happens to code /above/
your `extend' with the new enum item? Do the changes propagate up?

For instance:

// enum.h:
enum ThreadState { ERROR = -1, RUNNING, TERMINATED };

void PrintState(ThreadState state) {
    switch (state) {
    case ERROR: cout << "Error"; break;
    case RUNNING: cout << "Running"; break;
    case TERMINATED: cout << "Terminated"; break;
    default: throw exception("Invalid State.");

// enum2.h:
extend enum ThreadState { CANCELLED };

int main() {
    PrintState(CANCELLED); // Prints or throws or what?
    return 0;


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