How to set default parameter as class object in c++?

Question

I want to set my function with class object parameter set as default. But when I try to do that it fails in compilation.

class base {
 // ...
};

int myfunc(         


        

Answer 1

@tenfour answer forgot to mention another possible way. You also define a global variable object which you can construct as you like, then set it as the default value:

#include 

class MyCustomClassType
{
  int var;

  friend std::ostream &operator<<( 
        std::ostream &output, const MyCustomClassType &my_custom_class_type )
  {
    output << my_custom_class_type.var;
    return output;
  }
};

// C++11 syntax initialization call to the default constructor
MyCustomClassType _my_custom_class_type{};

void function(MyCustomClassType my_custom_class_type = _my_custom_class_type) {
  std::cout << my_custom_class_type << std::endl;
}

/**
 * To build it use:
 *     g++ -std=c++11 main.cpp -o main
 */
int main (int argc, char *argv[]) {
  function();
}