如何编写一个可以带参数的宏？
我想使用一些 NSAssert 和其他东西来在我的应用程序中更好地进行调试。 NSAssert 需要一个在断言失败时打印的字符串。不错，但除非您在该字符串中输入一大堆信息，否则毫无用处，如果到处输入这些信息，可能会变得一团糟。
所以我想制作一个宏，它将使用一个充满有用信息（如类名、方法名和其他内容）的字符串来执行 NSAssert 调用。但更重要的是，我还想提供自定义评论。想象一下这样的宏：
USEFUL_ASSERT(foo != nil, @"that isn't good, real")
由于很多原因，我不能在这里使用函数或方法调用，因为上下文会丢失，我不能找出哪个类导致了该问题，哪个方法导致了该问题。这只能在该方法本身内部完成，因此我必须为这些信息传递很多参数，例如 [self class] 和 _cmd，但我不希望所有这些东西散落各处。插入的代码越短，维护起来就越好。
有什么想法吗？
I want to use some NSAssert stuff and other things to enable better debugging in my app. NSAssert wants a string which it prints if the assertion fails. Nice, but useless unless you type a whole bunch of information in that string, which can become a big mess when done all over the place.
So I want to make a macro that will do the NSAssert call with an string equipped full of useful information like the class name, the method name and other stuff. But more important, I want to provide a custom comment as well. Imagine a macro like this:
USEFUL_ASSERT(foo != nil, @"that wasn't good, really")
for a lot of reasons I can't use a function or method call here, because context would be lost and I could not find out which class caused that problem, which method caused that problem. That can only be done inside that method itself, so I would have to pass a lot of parameters for this information like [self class] and _cmd, but I don't want all this stuff scattered everywhere. The shorter the code to insert, the better to maintain.
Any idea?
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查看宏文档。
Take a look at the macro docs.