module model.base;

/**
 * The base class for all persistent entities with a unique integer id.
 * It offers some basic utilities like equality and comparison by default.
 */
abstract class IdEntity {
    const ulong id;

    this(ulong id) {
        this.id = id;
    }

    override bool opEquals(Object other) const {
        if (IdEntity e = cast(IdEntity) other) {
            return e.id == id;
        }
        return false;
    }

    override size_t toHash() const {
        import std.conv : to;
        return id.to!size_t;
    }

    override string toString() const {
        import std.format : format;
        return format!"IdEntity(id = %d)"(id);
    }

    override int opCmp(Object other) const {
        if (IdEntity e = cast(IdEntity) other) {
            return this.id < e.id;
        }
        return 1;
    }
}