Adding multiple logging outputs

A good way to validate that a design works with multiple scenarios is to implement solutions for each scenario. We have a common Output interface class that defines two methods, clone and sendLine, and we need to make sure this interface will work for sending log messages to a log file and to the console.

Let’s start with a class called FileOutput that inherits from Output. The new class goes in Log.h right after the getOutputs and the addLogOutput functions, like this:

class FileOutput : public Output
{
public:
    FileOutput (std::string_view dir)
    : mOutputDir(dir),
    mFileNamePattern("{}"),
    mMaxSize(0),
    mRolloverCount(0)
    { }
    FileOutput (FileOutput const & rhs)
    : mOutputDir(rhs.mOutputDir),
    mFileNamePattern(rhs.mFileNamePattern...