title: Include <string> not found compile error in Xcode 4.2
body: <p>I'm getting include  not found compile error in XCode. I have an iOS app project that i use Objective-c and c++ as mix. </p>
  
  <p>Initially, i created one .h file and one .cpp file in my ios project. Then, I renamed the .cpp file to .mm file.</p>
  
  <p>Here is my .h file;</p>
  
  <p>TestLog.h</p>
  
  <pre><code>#ifndef CalculatorDemo_TestLog_h
  #define CalculatorDemo_TestLog_h
  #include &lt;string&gt;
  using namespace std;
  
  class TestLog
  {
  private:
      string logString;
  public:
      void Log(string logMessage);
  };
  
  
  #endif
  </code></pre>
  
  <p>TestLog.mm</p>
  
  <pre><code>#include "TestLog.h"
  
  void TestLog::Log(string logMessage)
  {
      //this-&gt;logString-&gt;append(logMessage);
  
  }
  </code></pre>
  
  <p>What am I missing? Do I need to add std c++ library to my targetS? Something related to Search Header Paths?</p>
  
  <p>I just need to use string type.</p>
  
  <p>Thanks much for in advance</p>