从C++库中通知ObjectiveC.-NotifyObjectiveCfromC++library

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I have a similar project where much of the logic is implemented as a C++ library, which can be compiled either as a static or dynamic library. I also have a command line C++ test program, so all of my callbacks, which basically amount to how far they have got with something with the option to cancel, are implemented as simple C++ callbacks:

我有一个类似的项目,其中许多逻辑实现为C ++库,可以编译为静态或动态库。我还有一个命令行C ++测试程序,所以我的所有回调,基本上等于它们与取消选项的东西有多远,实现为简单的C ++回调:

extern "C"
{
/**
 * Callback function from long operations.
 *
 * @param gameNum The number of the game being processed (1-based).
 * @param percentComplete Processing progress. (0.0 to 100.0).
 * @param contextInfo Context Info passed to the database method.
 *
 * @return false to terminate processing, else true.
 */
typedef bool(*DATABASE_CALLBACK_FUNC)(unsigned gameNum, float percentComplete, void *contextInfo);
}

This works equally well in the C++ command line tool as the Objective-C++ based Cocoa app.

这在基于Objective-C ++的Cocoa应用程序的C ++命令行工具中同样有效。

Notice that I use extern C to make it also possible to use from C.

请注意,我使用extern C使其也可以从C使用。