Compile error if method signature contains type whose operator bool is not public

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The following sample code leads to a compile error:

     5  class Result
     6  {
     7  public:
     8  private:
     9    operator bool() const { return false; }
    10  };
    11  
    12  class Database
    13  {
    14  public:
    15    virtual Result exec(const std::string& sql) = 0;
    16  };
    17  
    18  class MockDatabase : public Database
    19  {
    20  public:
    21    MOCK_METHOD1(exec,
    22      Result(const std::string& sql));
    23  };

The g++ compiler complains that the operator bool of the class Result is 
private:

main.cpp:9:3: Fehler: »Result::operator bool() const« is private
/usr/include/gtest/gtest-printers.h:169:42: error: in this context

That's a bug in my eyes. Is there a way to workaround this. The class Result
is part of 3rd party library such that I can't change it.

Regards, Hakan

Original issue reported on code.google.com by hyuek...@astaro.com on 29 Feb 2012 at 2:47