qt: use std::monostate instead of null pointer
I have come up to https://devblogs.microsoft.com/oldnewthing/20240708-00/?p=109959, which seems to explain the intended use case of std::monostate
.
I have come up to https://devblogs.microsoft.com/oldnewthing/20240708-00/?p=109959, which seems to explain the intended use case of std::monostate
.
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