如何在C ++中的同一类的构造函数中调用重载的构造函数？

Question

I have two very related problems; first, to call a overloaded constructor within a same class and second, to reinitialize the calling object with load_from_file() function. Here is an example:

class FooA: FooB
{
  FooA();
  FooA(myDataType distribution):FooB(distribution)
  FooA(myClasstype objectA):FooA(objectA.get_distribution){} // suppose objectA has a method get_distribution(). 
..
...

} 

It gives an error:

illegal member initialization

Second problem:

class FooA: FooB
{
  FooA();
  FooA(myDataType distribution):FooB(distribution)

void load_from_file(string file_name){
         // i have another library function to load from file
         JointDistribution jd = load_from_file(file_name);

        // now i want to re-configure the current object
        *this = FooA(jd);
}

FooA* fa = new FooA();

fa.load_from_file("file_name");

There are different file formats, so it is difficult to put them as a constructor.

Answer 1

第一个问题-如果objectA.get_distribution是一个方法，则应该在那里调用一个方法:FooB(objectA.get_distribution())

Answer 2

here:

    class FooA: FooB
    {
      FooA();
      FooA(myDataType distribution):FooB(distribution)

       void load_from_file(string file_name){
       }
    };

function load_from_file is private so you can't call it like you have written:

FooA* fa = new FooA();
fa.load_from_file("file_name");

constructors are private also... (though sometimes we want them to be private, but I assume here it is not the case xD]

you can call constructor from constructor:

class CComplex{
public:
    CComplex(int real1,int image1)
    {
        real=real1;
        image=image1;
        const char& x='x';
        CComplex(1,2,3);
    }
    CComplex():real(0),image(0){}
    CComplex(const CComplex &c)
    {
        real=c.real;
        image=c.image;
    }
    CComplex(int i1, int i2, int i3){cout<<"\n123!";}
public:


    int real,image;
};

Answer 3

For your first question, there is no constructor delegation prior to c++11, while the syntax you have used is correct for c++11. Just make sure you've enabled c++11 compilation and it should work fine. If you can't use C++11 you're going to have to duplicate some code.

I can't understand if/what your second question is (regarding reload).