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| 22-09-09 / 00:23 : Apple : article on Grand Central Dispatch Blocks (cjed) |
| Apple provides an article about programming with Grand Central Dispatch's Blocks : Block objects (informally, “blocks”) are an extension to C, as well as Objective-C and C++, that make it easy for programmers to define self-contained units of work. Blocks are similar to — but far more powerful than — traditional function pointers. The key differences are: - Blocks can be defined inline, as “anonymous functions.” - Blocks capture read-only copies of local variables, similar to “closures” in other languages This is kind of functionality is common in dynamically-typed interpreted languages, but has never before been widely available to C programmers. Dispatch queues and dispatch semaphores are also presented. |
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