D Language
Des classes
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Syntaxe
- classe Foo {} // hérite de Object
- class Bar: Foo {} // La barre est aussi un Foo
- Foo f = new Foo (); // instancie de nouveaux objets sur le tas
Remarques
Voir la spécification , parcourir un chapitre de livre sur les classes , l' héritage et jouer de manière interactive .
Héritage
class Animal
{
abstract int maxSize(); // must be implemented by sub-class
final float maxSizeInMeters() // can't be overridden by base class
{
return maxSize() / 100.0;
}
}
class Lion: Animal
{
override int maxSize() { return 350; }
}
void main()
{
import std.stdio : writeln;
auto l = new Lion();
assert(l.maxSizeInMeters() == 3.5);
writeln(l.maxSizeInMeters()); // 3.5
}
Instanciation
class Lion
{
private double weight; // only accessible with-in class
this(double weight)
{
this.weight = weight;
}
double weightInPounds() const @property // const guarantees no modifications
// @property functions are treated as fields
{
return weight * 2.204;
}
}
void main()
{
import std.stdio : writeln;
auto l = new Lion(100);
assert(l.weightInPounds == 220.4);
writeln(l.weightInPounds); // 220.4
}
Modified text is an extract of the original Stack Overflow Documentation
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