无法从“ _int64”转换为“数据*”

Question

In my project i have a class to work with time, it's declared like this:

class Data {
    int dia;
    int mes;
    int ano;
    int hora;
    int minuto;

    public:
       Data();
       Data(int, int, int, int, int);
       Data(const Data &);
       void mostraData();
       void ImprimeData();
       Data operator-(const Data &aux);
};

dia = day, mes = month, ano = year, hora = hour.... (portuguese)

And at certain point i have to calculate the difference between two differente times. So i made this simple operator -:

Data Data::operator-(const Data & aux){
    Data temp(0, 0, 0, 0, 0);
    temp.dia = this->dia - aux.dia;
    temp.mes = this->mes - aux.mes;
    temp.ano = this->ano - aux.ano;
    temp.hora = this->hora - aux.hora;
    temp.minuto = this->minuto - aux.minuto;
    return temp;
}

Now, I was just testing to see if it calculates the right time, I wrote this peace of code:

aux = new Data;
Data *teste = new Data(7, 7, 2016, 22, 41);
Data * resultado = teste - aux;
resultado->ImprimeData();

Ps. the function "ImprimeData()" is to print the result. But on the third line it gives me an error. First it says that a value of tipo 'long long' cannot be used to initialize an entety of type 'Data *', and then it says that cannot convert from _int64 to Data *.

Answer 1

This line

Data * resultado = teste - aux;

should be

Data resultado = *teste - *aux;

The first is subtracting two pointer values. The second is calling your operator - overload.

You should also change

resultado->ImprimeData();

to

resultado.ImprimeData();

Answer 2

Your teste is a pointer, as is your aux.

Which is a bit off since my testes would be considered more a container and/or factory.