Validate_ptrs If a pointer that was previously not allocated by malloc is passed to the free call, an error message is thrown and the program is aborted.

validate_ptrs如果向free调用传递的指针并不是以前由malloc分配的，那么将会引发一个错误消息，而该程序将被中止。

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The compiler is free to reorder certain instructions as an optimization when it would not change the semantics of the program.

当编译器不会改变程序的语义时，作为一种优化它可以随意地重新排序某些指令。

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If the program creates many long-lived objects, lazy sweep may not be able to find a free object.

如果程序创建了许多长生命周期的对象，延迟清理可能无法找到自由对象。

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Not only was the program free for the cash-strapped U.S. Navy veteran, but it also offered the kind of hands-on training in building and maintaining networks that he needed.

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Children who are not insured can receive vaccinations for free under the Vaccines for Children program.

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Some electric-vehicle owners say the airport should expand its free-parking program to cover all eight of its short-term lots, not just the two with charging stations.

WSJ: It's Less Easy Being 'Green' as Los Angeles Yanks Plug on Free Parking for Electric Cars