On Monday, 7 June 2021 at 15:26:27 UTC, someone wrote:
Consider the following code:
```d
class classComputer {
private string pstrName;
final @property string name() { return this.pstrName; }
final @property void name(in string lstrName) {
this.pstrName = lstrName; }
this(
string lstrComputerName
) {
this.pstrName = lstrComputerName;
}
}
class classComputers {
classComputers lhs;
classComputers rhs;
int opApply(int delegate(classComputers) dg) { ///
boilerplate code to handle the class's default collection
if (lhs && lhs.opApply(dg)) return 1;
if (dg(this)) return 1;
if (rhs && rhs.opApply(dg)) return 1;
return 0;
}
public classComputer[] computers; /// how can I tag this as
the default property ?
}
void main (
) {
classComputers lobjComputers = new classComputers;
lobjComputers.computers ~= new classComputer("dell");
lobjComputers.computers ~= new classComputer("ibm");
lobjComputers.computers ~= new classComputer("apple");
lobjComputers.computers[1].name = r"lenovo";
foreach(lobjComputer; lobjComputers.computers) {
writeln(lobjComputer.name); }
///foreach(lobjComputer; lobjComputers) {
writeln(lobjComputer.name); } /// with default property (if
possible)
I think you meant to implement ranges? you can implement in the
way you wanted: ```foreach(lobjComputer; lobjComputers)``` but
the recommend approach is to get this array through the array
index operator. It would go like this:
```d
class classComputer
{
private string pstrName;
final string name() { return this.pstrName; }
final void name(in string lstrName) { this.pstrName =
lstrName; }
this(string lstrComputerName = null) {
this.pstrName = lstrComputerName;
}
classComputer lhs;
classComputer rhs;
int opApply(int delegate(classComputer) dg) { /// boilerplate
code to handle the class's default collection
if (lhs && lhs.opApply(dg)) return 1;
if (dg(this)) return 1;
if (rhs && rhs.opApply(dg)) return 1;
return 0;
}
public classComputer[] computers; /// how can I tag this as
the default property ?
auto opIndex() nothrow
{
return Range(computers);
}
protected static struct Range
{
private classComputer[] a;
auto front() { return a[0]; }
auto back() { return a[$ - 1]; }
void popFront() { a = a[1 .. $]; }
bool empty() { return a.length == 0; }
size_t opDollar() { return a.length; }
auto opSlice(size_t start, size_t end)
{
return a[start .. end];
}
}
}
void main ()
{
import std.stdio : writeln;
auto lobjComputers = new classComputer;
lobjComputers.computers ~= new classComputer("dell");
lobjComputers.computers ~= new classComputer("ibm");
lobjComputers.computers ~= new classComputer("apple");
lobjComputers.computers[1].name = r"lenovo";
foreach(lobjComputer; lobjComputers[]) {
writeln(lobjComputer.name); }
///foreach(lobjComputer; lobjComputers) {
writeln(lobjComputer.name); } /// with default property (if
possible)
}
```
}
```
