Managed C++, convert String^ to std::string

MartialString.cpp

  /// ----------------------------------------------------------------------------
  /// <summary>Convert from String^ to std::string</summary>
  System::Void TestClass::MarshalString(String ^ strIn, string& strOut)
  {
    using namespace Runtime::InteropServices;
    const char* chars = (const char*)(Marshal::StringToHGlobalAnsi(strIn)).ToPointer();
    strOut = chars;
    Marshal::FreeHGlobal(IntPtr((void*)chars));
  }