defining a vector of template class

[anotheruser]

Hi everyone,

I'm trying to define a vector that contains a template class. I create the class, then I create two objects from it (to validate) and then I want to create a vector that contains, for example the two objects created, but I don´t know how to pass the type of the vector. I tried differents way but always fail. The template has 4 parameters, even it wold be the same with only one.Here`s the code

 template <typename f,typename reg,typename id ,typename mod>
 class datos{                 
 public:
   f dato;
   reg tipo;
   id id_reg;
   mod modif;
   datos(f vdato,reg tipo_dato,id tid_reg,mod tid_modif)  
     {dato=vdato;
     tipo=tipo_dato ;
     id_reg=tid_reg;
     modif=tid_modif;}
   };
    
   

int main()  {
int entero=43;
int identificador=99;
float d=98.7645;
int* a;
a=&entero;
int* i;
i=&identificador;
datos <int,char,int,char> mi (*a,'c',*i,'n');
datos <float,char,int,char> mi2 (d,'c',*a,'n');
cout<<mi.dato<<endl;
cout<<mi.tipo<<endl;
cout<<mi.id_reg<<endl;
cout<<mi.modif<<endl;
cout<<mi2.dato<<endl;
cout<<mi2.tipo<<endl;
cout<<mi2.id_reg<<endl;
cout<<mi2.modif<<endl;
       
       
vector <datos<float,char,int,char> > mivector (2);
return 0 ;
}

Thank you in advance.

[Warnis]

I suspect its because you don't have a default constructor

[Disch]

You can't.

Types in a container have to be the same. datos<float,char,int,char> and datos<int,char,int,char> are two completely different types.

It'd be like trying to put a float and an int in the same vector -- it just can't be done.

[anotheruser]

ok, it´s not well said. Sorry english is not my language, I want to do a vector of type <float,char,int,char> and another one for rxample of type <int,char,int,char>

Warnis, About the default constructor ¿did you mean to make a constructor that assigns constant values for example to the parameters of the class? After that How would I call the type inside the vector declaration?

Thank you all

[Duthomhas]

You can make your constructor work as the default constructor by providing default values to the arguments. You can also use an initializer list:

datos(
  f   vdato     = f(),
  reg tipo_dato = reg(),
  id  tid_reg   = id(),
  mod tid_modif = mod()
  ):
  dato( vdato ),
  tipo( tipo_dato ),
  id_reg( tid_reg ),
  modif( tid_modif )
  { }

Hope this helps.

[anotheruser]

it helped Duoas, the code complie perfectly and it works. Thank you so much. In addition , I learnt about a (more efficient as I could read, and new for me ) method to create default constructors.

Regards.