Implementing Closures in C Using JIT-Compiled Wrappers for Win32 Window Procedures
By
ibobev
Pure flour-power. Hearty enough to carry you through lunch.
Summary
The article discusses an advanced programming technique for creating closures in C using JIT-compiled wrappers, specifically applied to Win32 window procedures. The author revisits a 2017 technique that uses just-in-time compilation to generate wrapper functions that can capture context and act as closures, which is particularly useful for Windows API programming where window procedures need to maintain state. The technique addresses limitations in C's lack of native closure support and demonstrates practical applications for working with APIs like qsort and custom allocator interfaces.
Key quotes
· 5 pulledBack in 2017 I wrote about a technique for creating closures in C using JIT-compiled wrapper.
It's neat, though rarely necessary in real programs, so I don't think about it often.
I applied it to qsort, which sadly accepts no context pointer.
More practical would be working around insufficient custom allocator interfaces, to create allocation functions at run-time bound to a particular allocation region.
I've learned a lot since I last wrote about this subject, and a recent article had me thinking about it again.
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