'How can I quick fix an error from an C++ lib

I'm a newbie on C++, and now I'm debugging an C# application that call an C++ library, then I got an error from C++ lib, I'm confused and don't know how to resolve the error, can anyone help to explain the C++ code by java or c# style? I had found the code:

 bool ValidateClientClass(long clientClass)
      {
        if (clientClass > -1 && clientClass <= std::numeric_limits<FC::DataRecordBase::DataSource_t>::max())
          return true;
        return false;
      }

the input a client class '1', the I got false. I can't understand std::numeric_limits<FC::DataRecordBase::DataSource_t>::max(), how does this mean in C++?

I expect a method to return true from previous code.

c++


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