Readit Newshttps://github.com/pjmlp/LambdaWndProc/blob/main/LambdaWndPr...
Another seemingly underutilised feature closely related to {Get,Set}WindowLong is cbClsExtra/cbWndExtra which lets you allocate additional data associated with a window, and store whatever you want there. The indices to the GWL/SWL function are quite revealing of how this mechanism works:
https://learn.microsoft.com/en-us/windows/win32/api/winuser/...
C++ lambdas are basically old style C++ functors that are compiled generated, with the calling address being the operator().
I guess I need to prove a point on my Github during next week.
The code as written, though, is missing a call to FlushInstructionCache() and might not work in processes that prohibit dynamic code generation. An alternative is to just pregenerate an array of trampolines in a code segment, each referencing a mutable pointer in a parallel array in the data segment. These can be generated straightforwardly with a little template magic. This adds size to the executable unlike an empty RWX segment, but doesn't run afoul of any dynamic codegen restrictions or require I-cache flushing. The number of trampolines must be predetermined, but the RWX segment has the same limitation.
Running in tmux, marking anything on my terminal immediately puts it into the tmux buffer, without me having to click anything on the keyboard. Pressing middle-mouse pastes it.
THAT is convenience.