On Wed, Apr 11, 2012 at 01:13:17AM +0200, Jonas H. wrote:
> Hi everyone,
>
> does D have any runtime higher-order function facilities? (I'm not
> talking about templates.)
>
> More specifically, is something like this possible? (That's how I'd
> do it in Python)
>
> car_prices = map(Car.get_price, list_of_cars)
>
> car = new Car
> foobar(car.get_price)
[...]
You can use delegates. Example:
struct Car {
int price;
int wheels;
int get_price() { return price; }
int get_wheels() { return wheels; }
}
int sum(int delegate(Car) dg, Car[] cars) {
int sum = 0;
foreach (c; cars) {
sum += dg(c);
}
return sum;
}
void main() {
Car[] cars;
cars ~= Car();
... // add some stuff to the list
int total_price = sum((Car c) => (c.get_price()), cars);
int total_wheels = sum((Car c) => (c.get_wheels()), cars);
}
T
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