'cmath' file not found

box2d 的 b2Vec2 类型和 cocos2d 的 CGPoint，CGSize， CGRect，我想拿出来自己用，

于是新建了一个 Terminal 工程。

因为 CGPoint 和 苹果自带的 CoreGraphics里面自带的~

而 box2d 里面的 b2Vec2 类型我也经常用到，

包含 b2Vec2 类型定义的头文件 b2Math.h 里面同时也包含了不少 有用的，线程的方法，

因此我很想来重复利用这些现成的东西。

但是遇到了一些问题：

‘cmatch’ file no found, 'iostream' not recognized等等，

包含在 b2Math.h 的

#include <cmath>

#include <cfloat>

#include <cstddef>

#include <cassert>

#include <limits>

等预编译指令，竟然每一个都有问题，都无法正常的引入！

后来找到了一篇帖子：

C++ #include help?

Quote:

Originally Posted byBlackBlade

cmath related errors are simply this, "cmath" file not found, and iostream is not recognized, i then went through the whole list of include functions(not sure what to call them) and the closest thing on there is IOsurface or IOsurface.h

Did you create a C++ project and not Objective-C or Cocoa? I you pick a Cocoa application you will get this error.

Quote:

Originally Posted bysubsonix

Did you create a C++ project and not Objective-C or Cocoa? I you pick a Cocoa application you will get this error.

i am an idiot, i figured it out, i never made a file in the project i simply used main.m
just tried making a c++ file and it worked

thanks a lot, now i won't fail! thanks again

根据帖子里面所提到的相关信息，在我将 main.m 改成 main.mm 文件以后，编译成功通过~