MacOS / X 10.8.x中不推荐使用的Carbon函数怎么办？ [英] What to do about Carbon functions that are deprecated in MacOS/X 10.8.x?

问题描述

我有一个已经存在了一段时间（超过10年）的C ++代码库，并且可以正常运行，但是我注意到当我在OS / X 10.8.x（Mountain Lion）下进行编译时，编译器会发出关于它调用的某些Carbon函数的弃用警告：

I have a C++ codebase that has been around for a while (10+ years) and it compiles and runs fine, but I notice that when I compile it under OS/X 10.8.x (Mountain Lion), the compiler emits deprecation warnings about some of the Carbon functions it calls:

../system/SetupSystem.cpp:575:44: warning: 'UpTime' is deprecated: first
  deprecated in OS X 10.8 [-Wdeprecated-declarations]
../system/SetupSystem.cpp:575:22: warning: 'AbsoluteToNanoseconds' is
  deprecated: first deprecated in OS X 10.8 [-Wdeprecated-declarations]
../system/SystemInfo.cpp:249:25: warning: 'MPProcessors' is deprecated: first deprecated in OS X 10.7 [-Wdeprecated-declarations]

我想将此代码库升级为Apple批准的新工作方式（因此如果/当苹果最终删除这些功能时，避免警告和将来的痛苦），但我不知道新标准是什么。我浏览了developer.apple.com上的OS / X文档，但是缺少搜索技能或者缺少他们的文档，因为我几乎找不到这些功能，也没有替换它们。

I'd like to upgrade this codebase to the new Apple-approved way of doing things (and thus avoid the warnings and future pain if/when Apple finally removes these functions), but I can't figure out what the new standard is. I looked through the OS/X documentation at developer.apple.com, but either my searching skills are lacking or their documentation is, as I find next to nothing about these functions and nothing about their replacements.

我遇到的特定问题：

1. 为什么不推荐使用这些功能？


2. 应该改用什么函数？


3. 是否存在一些我不知道的秘密文档存储库，可以为我回答这些问题？

推荐答案

我找到了上面列出的功能的可用替代品：

I've found usable replacements for the functions listed above:

1. UpTime（）可以替换为对mach_absolute_time（）的调用，详情请参见此处


2. AbsoluteToNanoseconds（）可以用一点数学代替，如上面的链接所示。


3. MPProcessors可以通过调用来代替host_info（），如下所示：

#include <mach/mach_host.h>

mach_msg_type_number_t infoCount = HOST_BASIC_INFO_COUNT;
host_info(gHostPort, HOST_BASIC_INFO, (host_info_t)&hostInfo, &infoCount);
int numProcessors = hostInfo.avail_cpus;

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