Array of objects with non-default constructor possible ?

[crabhunt]

Hi !

Is it possible to create an array of objects of a class with a constructor that takes some arguments ? If so what is declaration like ?

I mean say I have

class ABC{
int i;
public:
ABC(int m){
i = m;
}
}

To create one object we declare as

ABC *var = new ABC(4);

but if I want to create an array of 100 elements of these objects all initialized to 4, can I do something like :

ABC **var = new ABC[100](4);

???

Thanks

[horace1]

Hi !

Is it possible to create an array of objects of a class with a constructor that takes some arguments ? If so what is declaration like ?

I mean say I have

class ABC{
int i;
public:
ABC(int m){
i = m;
}
}

To create one object we declare as

ABC *var = new ABC(4);

but if I want to create an array of 100 elements of these objects all initialized to 4, can I do something like :

ABC **var = new ABC[100](4);

???

Thanks

the default constructor is called when you create an array - however, you can have a default constuctor that takles parameters so long as you give it default values, e.g.

class ABC{
int i;
public:
  ABC(int m=4){  // default constructor
i = m;
}
};
 
 
ABC var = ABC(4);
ABC var1[100];
ABC *var2 = new ABC[100];
 

alternativing you can use a vector which allows you to use any constructor, e.g.

#include <vector>
using namespace std;
 
class ABC{
int i;
public:
  ABC(int m){  // default constructor
i = m;
}
};
 
// create vector with 10 elements initiualised to 4
vector<ABC> var(10, ABC(4));