Page 496 of Programming in D
Going in circles. Please correct so it compiles and works.
An explanation would be helpful also.
Error Message
```
c:\dev\D\71 - 80\c73_2d_School_Student_Teacher\source\app.d(23):
Error: cannot implicitly convert expression
`this.students[cast(ulong)i]` of type `const(Student)` to
`app.Student`
Student student = students[i];
^
```
source/app.d
```
import std.stdio;
void main() {
auto school = new School;
foreach (Student student; school) {
}
foreach (Teacher teacher; school) {
}
}
class School {
Student[] students;
Teacher[] teachers;
int opApply(int delegate(ref Student) dg) const {
int result = 0;
for (int i = 0; i < students.length; ++i) {
Student student = students[i];
result = dg(student);
if (result) break;
}
return result;
}
int opApply(int delegate(ref Teacher) dg) const {
int result = 0;
return result;
}
}
class Student {
string name;
}
class Teacher {
string name;
}
```
