Category copy constructor

[Sergey Matveychuk]

I cant to build the example from http://soldc.sun.com/articles/logging.html/
because of error on this line:
log4cpp::Category main_cat =
                 log4cpp::Category::getInstance("main_cat");

I see Category copy constructor is protected.
How can I change this line to work?

[Bastiaan Bakker]

Copy construction is explicitly not alllowed for Category, the line should use a reference instead:

log4cpp::Category& main_cat =
log4cpp::Category::getInstance("main_cat");

Bastiaan

[Håkan Jonsson]

Beginners question: So if I want a private member main_cat that can be accessed by all methods, how do I initialize main_cat?

[Bastiaan Bakker]

You can't have a member instance of Category, only a member reference to Category. You can initialize it like any other reference member of a class:

class MyClass {

[Bastiaan Bakker]

You can't have a member instance of Category, only a member reference to Category. You can initialize it like any other reference member of a class:

class MyClass {
   public:
   MyClass() :
      main_cat(log4cpp::Category::getInstance("main_cat")) {
         // constructor code
   };

   private:
   log4cpp::Category& main_cat;
};

Bastiaan