Cancellation token improvements #674
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This is important if a late callback could end up accessing an already-destructed object. Previously, the only way to revoke a cancellation callback was to replace it with a nop delegate `[]()`, which is clunky.
That way you can use a captured cancellation token from a lambda.
oldnewthing
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kennykerr
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Jun 29, 2020
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Allow revoking cancellation callback by setting it to null. This is important if a late callback could end up accessing an already-destructed object. Previously, the only way to revoke a cancellation callback was to replace it with a nop delegate
[](), which is clunky.Make the token's callback method const. This makes it easier to capture a token into a lambda.