D Language Ranges Making a new Input Range type
Example
The InputRange concept has three functions, example:
struct InputRange(T) {
@property bool empty();
@property T front();
void popFront();
}
In short, a way to
- check if the range is empty
- get the current element
- move to the next element
To make our own type a InputRange, we must implement these three functions. Let's take a look at the infinite sequence of squares.
struct SquaresRange {
int cur = 1;
@property bool empty() {
return false;
}
@property int front() {
return cur^^2;
}
void popFront() {
cur++;
}
}
See the D tour for an example with Fibonacci.
