The Old New Thing

The C++ implicit assignment operator is a non-ref-qualified member, even if the base class’s assignment has a ref-qualifier

September 16, 2021 Sep 16, 2021 09/16/21

Raymond Chen

Does that count as dis-qualification?

How do I set the alpha channel of a GDI bitmap to 255?

September 15, 2021 Sep 15, 2021 09/15/21

Raymond Chen

Most things destroy the alpha channel, but there's a way to bring it back, or at least make it opaque.

The C++/WinRT query_interface_tearoff extension point, and using it for COM aggregation

September 13, 2021 Sep 13, 2021 09/13/21

Raymond Chen

For adding your own QueryInterface magic.

Ordering asynchronous updates with coroutines, part 5: Bowing out via cancellation

September 10, 2021 Sep 10, 2021 09/10/21

Raymond Chen

Using the built-in way of stopping a coroutine.

Ordering asynchronous updates with coroutines, part 4: Bowing out, explicit version

September 9, 2021 Sep 9, 2021 09/9/21

Raymond Chen

Realizing you're not the one.

Ordering asynchronous updates with coroutines, part 3: Let them all compete, but only one wins

September 8, 2021 Sep 8, 2021 09/8/21

Raymond Chen

Everybody tries, but only one wins.

Ordering asynchronous updates with coroutines, part 2: Restart with hand-off

September 7, 2021 Sep 7, 2021 09/7/21

Raymond Chen

Everybody just waits their turn.

Ordering asynchronous updates with coroutines, part 1: Mutual exclusion

September 6, 2021 Sep 6, 2021 09/6/21

Raymond Chen

Everybody just waits their turn.

I declared my Windows Runtime method as accepting an array by reference, but it always arrives empty

September 3, 2021 Sep 3, 2021 09/3/21

Raymond Chen

You were only meant to put things into the box, not look at what was already there.