Objective-C中的严格类型检查第2部分 [英] Strict Type Checking in Objective-C Part 2

问题描述

在这个问题中，我一直在寻找一种方法，使用define来确保变量属于某种类型。但有时我会遇到这种情况：

In this question I was looking for a way to ensure that a variable is of a certain type using a define. But sometimes I have this situation:

- (void) theSituation:(Thinger*)thinger {
    ASSERT_IS_KIND_OF(thinger, Thinger);
    // etc. etc.

然后我开始考虑，进行调试仅限目的，能够调用以下内容可能会很好：

Then I started thinking that, for debugging purposes ONLY, it might be nice to be able to call something like:

- (void) theSituation:(Thinger*)thinger {
    ASSERT_INPUT_PARAMS_ARE_OF_CORRECT_TYPES();
    // etc. etc.

问题是：你能检查一下a的参数吗？方法是正确的类型（使用 isKindOf ）通过 #define ，你会怎么做（一般来说） ）？

The question is: could you check that parameters of a method are of the right type (using isKindOf) via #define, and how would you do this (in general terms)?

推荐答案

获取方法的参数时（使用 method_copyArgumentType 如另一个答案中所提到的，它返回的类型是C类型（如int，float等）或只是Object（返回为@）。遗憾的是，不可能得到方法所期望的Objective-C类型 - 编译时信息会丢失。

When you get the arguments of a method (using method_copyArgumentType as mentioned in the other answer), the "type" it returns is either a C type (like int, float, etc) or just Object (returned as a "@"). Sadly it's not possible to get the objective-C type that a method is expecting — that information is lost when you compile.

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