C++ Objective-C 中的管道
我不久前从 C++ 过渡到 Objective-C，现在发现 NSLog() 很烦人。相反，仍然在 Objective-C 中，我希望能够编写类似的东西 标准输出<< “答案是”<<第42话“\n”； （我知道 NSLog 打印到 stderr，我可以忍受编写 stderr << "Hello world"；）
基本上，我只是希望能够在 Objective-C 中使用 C++ 管道语法。
我不关心速度（在合理范围内）或者唯一的方法是否使用预编译器宏或其他黑客的东西。
I made the transition from C++ to objective-C a while ago, and am now finding NSLog() tiresome. Instead, still in Objective-C, I would like to be able to write something like
stdout << "The answer is " << 42 << "\n";
(I know that NSLog prints to stderr, I could put up with writing stderr << "Hello world";)
Basically, I just want to be able to use the C++ pipe syntax in Objective-C.
I don't care about speed (within reason) or if the only method uses precompiler macros or other hack-ish things.
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您想要的是流操作。
在 Cocoa 中没有一个真正“好”的方法来做到这一点，我有一个我从未真正充实过的库，它可以让你做一些“接近”的事情，但仍然不会得到很多好处。
http://github.com/jweinberg/Objective-Curry/blob/ master/OCFileStream.m
从那里开始，您将能够编写一个执行
[[[stdOutStream write:@"10"] write:[bleh description]] write:@"more stuff" 的 类];What you're wanting is stream operations.
There isn't a really 'good' way to do this in Cocoa, I have a library that I never really fleshed out that would allow you to do something 'near' this, but still wouldn't get a lot of the benifits.
http://github.com/jweinberg/Objective-Curry/blob/master/OCFileStream.m
Starting from there you would be able to write a class that did
[[[stdOutStream write:@"10"] write:[bleh description]] write:@"more stuff"];您确实应该习惯像
NSLog中那样格式化字符串。 C++ 风格的语法可能很容易编写，但维护起来却是一场噩梦。考虑国际化。格式字符串可以在运行时轻松加载。 Cocoa为此提供了函数NSLocalizedString。但对于 C++ 的流运算符，您可能必须为每种语言编写不同的代码。You really should get used to format strings as in
NSLog. The C++ style syntax may be easy to write, but it is a nightmare to maintain. Think about internationalization. A format string can easily be loaded at runtime. Cocoa provides the functionNSLocalizedStringfor that. But for C++’s stream operators you probably have to write different code for every language.