Re: c2 classes
On Friday, 6 April 2018 at 14:43:25 UTC, Ali wrote:
On Friday, 6 April 2018 at 14:31:49 UTC, Alex wrote:
On Friday, 6 April 2018 at 13:41:50 UTC, aerto wrote:
[...]
A question from me, since I am also still learning D
what is the difference between those following two declarations
UUsers[int] uid; UUsers[] uid;
T[U] declares an Associative Array but T[] declares a Dynamic
Array. Some examples will help:
---
void main()
{
char[int] s1;
char[] s2;
s1[1] = 'c'; //allowed, it is an Associative array. key 1
stores value 'c'
s2[0] = 1; //error: out of bounds of array s2
}
---
You can check out the spec[0] and the tour[1]
[0]: https://dlang.org/spec/hash-map.html
[1]: https://tour.dlang.org/tour/en/basics/associative-arrays
Re: c2 classes
On Friday, 6 April 2018 at 14:31:49 UTC, Alex wrote:
On Friday, 6 April 2018 at 13:41:50 UTC, aerto wrote:
its possible to make this work ??
import std.stdio;
class UUsers
{
public:
int age;
}
class users
{
public:
int[int] uid;
}
void main() {
users newuser = new users();
newuser.uid[0].age = 23;
writeln(newuser.uid[0].age);
}
It depends on what you want to achieve...
This is runnable:
```
import std.stdio;
class UUsers
{
this(int val)
{
age = val;
}
public:
int age;
}
class users
{
public:
UUsers[int] uid;
}
void main() {
users newuser = new users();
newuser.uid[0] = new UUsers(23);
writeln(newuser.uid[0].age);
}
```
A question from me, since I am also still learning D
what is the difference between those following two declarations
UUsers[int] uid; UUsers[] uid;
Re: c2 classes
On Friday, 6 April 2018 at 13:41:50 UTC, aerto wrote:
its possible to make this work ??
import std.stdio;
class UUsers
{
public:
int age;
}
class users
{
public:
int[int] uid;
}
void main() {
users newuser = new users();
newuser.uid[0].age = 23;
writeln(newuser.uid[0].age);
}
This will work
import std.stdio;
class UUsers
{
public:
int age;
}
class users
{
public:
UUsers[] uid;
}
void main() {
users userList = new users();
userList.uid ~= new UUsers();
userList.uid[0].age = 24 ;
writeln(userList.uid[0].age);
}
Let me try to explain why
Basically, what you wanted to do is have two classes
one will hold user's information, and another holding a user list
For the second class to hold user list
this line
int[int] uid;
became this line
UUsers[] uid;
In you code, there was no relation between the two classes
Then in your main
You instantiate your users list object
users userList = new users();
Then you instantiate a user object and append it to the list (~=
is the append operator)
userList.uid ~= new UUsers();
Finally you assign a value to your user object age and print it
userList.uid[0].age = 24 ;
writeln(userList.uid[0].age);
Re: c2 classes
On Friday, 6 April 2018 at 13:41:50 UTC, aerto wrote:
its possible to make this work ??
import std.stdio;
class UUsers
{
public:
int age;
}
class users
{
public:
int[int] uid;
}
void main() {
users newuser = new users();
newuser.uid[0].age = 23;
writeln(newuser.uid[0].age);
}
It depends on what you want to achieve...
This is runnable:
```
import std.stdio;
class UUsers
{
this(int val)
{
age = val;
}
public:
int age;
}
class users
{
public:
UUsers[int] uid;
}
void main() {
users newuser = new users();
newuser.uid[0] = new UUsers(23);
writeln(newuser.uid[0].age);
}
```
