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POCan't find standard C++ includes when using C++ class in Cocoa project
 

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  1. POCan't find standard C++ includes when using C++ class in Cocoa project
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    <p>I have a Cocoa project (a Mac OS X app), all Objective-C. I pulled in one C++ class (which I know works) from another project, and make an Objective-C wrapper for it. The ObjC wrapper class is using a .mm extension. However, the C++ header file contains <code>#include</code>s to standard C++ header files (<code>&lt;vector&gt;</code>, for example), and I get errors on those. </p> <p>A minimal example would look like the following. CppClass is the C++ class, and CppWrapper is the ObjC class which wraps it. </p> <pre><code>// CppClass.h #ifndef _CPP_CLASS_H_ #define _CPP_CLASS_H_ #include &lt;vector&gt; class CppClass { public: CppClass() {} ~CppClass() {} private: std::vector&lt;int&gt; my_ints; }; #endif /* _CPP_CLASS_H_ */ // CppWrapper.h #import &lt;Foundation/Foundation.h&gt; #import "CppClass.h" @interface CppWrapper : NSObject { CppClass* myCppClass; } @end // CppWrapper.mm #import "CppWrapper.h" @implementation CppWrapper - (id)init { self = [super init]; if (self) { myCppClass = new CppClass; } return self; } - (void)dealloc { delete myCppClass; [super dealloc]; } @end // The file that uses CppWrapper // TestAppDelegate.m #import "TestAppDelegate.h" #import "CppWrapper.h" @implementation TestAppDelegate - (void)applicationDidFinishLaunching:(NSNotification *)aNotification { myWrapper = [[CppWrapper alloc] init]; } @end </code></pre> <p>The error I'm getting is the <code>#include</code> of <code>vector</code> in CppClass.h. The error is</p> <blockquote> <p>lexical or Preprocessor issue: <code>'vector'</code> file not found</p> </blockquote> <p>This code works fine in another (all C++) project, so I'm pretty sure it's a build setting, or something I've done wrong in the wrapper class. I'm using Xcode 4. I created a default Cocoa Mac OS app project and all settings are default.</p> <p><strong>Update</strong>: I just realized that if I set TestAppDelegate's File Type to Objective-C++ (or rename it to TestAppDelegate.mm), it works. What I don't understand is, this class is pure Objective-C; why does it have to be compiled as Objective-C++? The whole point of having an Objective-C wrapper on my C++ class is so that I don't have to build the entire project as Objective-C++.</p>
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    1. CODid you try to restart Xcode 4? When I got the same error, I could resolve by just restarting Xcode 4.
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    2. CODoes this help? http://stackoverflow.com/q/5122728/240633
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    3. CO@Jinhyung yeah, I tried restart Xcode, also did a Clean; still get the same error.
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