August 2011
Intermediate to advanced
552 pages
23h 48m
English
Content preview from Advanced Mac OS X Programming: The Big Nerd Ranch GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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For the More Curious: Blocks Internals
Blocks and __block variables are implemented by a combination of structures and functions. These are generated by the compiler and maintained by a runtime environment. Knowing how things work under the hood is useful for understanding the details of memory management and debugging.
Implementation
The compiler interprets the new, block-specific syntax and generates data to interface with the runtime and code that relies on functions provided by the runtime. The blocks runtime enables the use of blocks while the application is actually running.
The specific compiler is irrelevant to our discussion. The most visible difference between gcc and clang is in the names generated for the private structures and functions ...
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