Question

How can I declare constructor for a struct? My struct is declared in the private part of a class and I want to declare my constructor for it.

Below is my code

class Datastructure {

private:

        struct Ship
        {
            std::string s_class;
            std::string name;
            unsigned int length;

        } minShip, maxShip; 

        std::vector<Ship> shipVector;
public:

    Datastructure();
    ~Datastructure();
};

This my header file; how can I declare constructor for my struct Ship and where do I have to implement that constructor in .h file or in cpp file?

Answer 1

Constructor declared in header file

struct Ship
{
    Ship();
    std::string s_class;
    std::string name;
    unsigned int length;

    } minShip, maxShip; 

and implemented in code:

DataStructure::Ship::Ship()
{
  // build the ship here
}

or more likely:

DataStructure::Ship::Ship(const string& shipClass, const string& name, 
                          const unsigned int len) :
s_class(shipClass), name(_name), length(len)
{
}

with this in the header:

    struct Ship
    {
private:
        Ship();
public:
        Ship(const string& shipClass, const string& name, unsigned len);
        std::string s_class;
        std::string name;
        unsigned int length;

        } minShip, maxShip;