内联函数“未定义符号"错误 [英] Inline function "undefined symbols" error

问题描述

我想编写一个内联函数，但出现错误.我该如何解决?

I want to write an inline function, but I get an error. How can I fix it?

错误信息:

Undefined symbols for architecture i386:
  "_XYInRect", referenced from:
      -[BeginAnimation ccTouchesEnded:withEvent:] in BeginAnimation.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

代码:

CGPoint location = CGPointMake(60, 350);

if (XYInRect(location, 53, 338, 263, 369)) {

}

inline BOOL XYInRect(CGPoint location, float MixX, float MixY, float MaxX ,float MaxY){
    if (location.x >MixX && location.y >MixY && location.x <MaxX && location.y <MaxY) {
        return YES;
    } else {
        return NO;

    }
}

推荐答案

Clang 默认为 C99 而不是 GNU 语义，这意味着原始 inline 不同于 static inline 和 extern inline.

Clang defaults to C99 and not GNU sematics, which means a raw inline is different from both static inline and extern inline.

特别是，原始 inline 意味着该函数仍然具有外部链接，但内联定义不提供外部链接(您需要 extern inline那个).

In particular, a raw inline means that the function still has external linkage, but the inline definition does not provide the external one (you'd need extern inline for that).

这意味着您需要在不同的翻译单元中添加额外的 extern 定义，否则链接将失败.但是，您可能正在寻找 static inline.

What this means is that you need an additional extern definition in a different translation unit or linking will fail. However, you're probably looking for static inline.

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