c++ - Proper way to make base class setup parent class -

i'm struggling bit following situation: lets have class "base" requires information in order work properly. therefore, i've set single constructor appropriate parameters, e.g.:

class base {     public: base(x x, y y, z z); }; 

this works fine general "bases". i'd have subclasses represent specific "bases" used , contain information required setup base class, e.g.:

class derived {     public: derived() {         x x;         x.addsomeinformation("foo bar");         // ...         // what?     } }; 

problem here cannot invoke parent constructor via initializer list (as 1 do) becaues parameters handed on not yet exist.

due this, feel wrong design. can make work introducing protected default constructor , "configure" method imitates normal constructor, i'm not sure if idea (mainly because way cannot ensure subclass invokes "configure" - , if doesn't leave me not initialized base class):

class base {     public: base(x x, y y, z z) { configure(x, y, z); }     protected: base() {}     protected: void configure(x x, y y, z z); };  class derived {     public: derived() {         x x;         // ...         configure(x, y, z);     } }; 

how 1 deal such situation in proper way?

my first suggestion make x have valuable constructor rather forcing default-constructed:

class derived {     public: derived() : base(x("foo bar"), <blah>) {     } }; 

if that's not option, split x-creation logic function , use that:

class derived {     public: derived() : base(make_x(), <blah>) {     }     private: static x make_x() {         x x;         x.addsomeinformation("foo bar");         // else needed.         return x;     }  };