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POLink error with Objective-C++/C++ in XCode 4.2 Lion (iOS product)
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  1. POLink error with Objective-C++/C++ in XCode 4.2 Lion (iOS product)
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    copied!<p>I am new to Objective-C and a bit rusty at using C++ and templates, and I am not sure why I am having this link error.</p> <p>I have a header file that contains definitions similar to these:</p> <pre><code>struct Info { std::string name; }; typedef std::map&lt;std::string, Info&gt; InfoMap; void Validate(InfoMap* infoMap); @interface InfoValidator : NSObject { } +(InfoValidator*) getInstance; -(void) validate:(InfoMap*)infoMap; @end </code></pre> <p>I also have an .mm file that contains the following definition for the (global) Validate() method:</p> <pre><code>void Validate(InfoMap* infoMap) { [[InfoValidator getInstance] validate:infoMap]; } </code></pre> <p>When I call Validate() from a C++ class (defined in an .mm file), I receive the following error:</p> <pre><code>Undefined symbols for architecture armv7: Validate(std::map&lt;std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, Info, std::less&lt;std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt; &gt;, &gt; std::allocator&lt;std::pair&lt;std::basic_string&lt;char, std::char_traits&lt;char&gt;, ?&gt; std::allocator&lt;char&gt; &gt; const, Info&gt; &gt; &gt;*)", referenced from: ItemInterface::ValidateItems(int, char const**)in iteminterface.o ld: symbol(s) not found for architecture armv7 collect2: ld returned 1 exit status </code></pre> <p>The file has been added to the project, and it is the only link error I get. Thanks for any help.</p>
 

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