new Head constructor

src/v0.rs

@@ -782,6 +782,8 @@ impl Head{
 	pub const fn new()->Self{
 		Self([0;NUM_EVENT_TYPES])
 	}
+	/// Use `Head::partition_point` instead.
+	#[deprecated]
 	pub fn after_time(block:&Block,time:f64)->Self{
 		Self([
 			block.input_events.partition_point(|event|event.time<=time),
@@ -794,6 +796,20 @@ impl Head{
 			block.setting_events.partition_point(|event|event.time<=time),
 		])
 	}
+	/// Uses a binary search to initialize the head positions according to a predicate.
+	/// You probably want `|event_time|event_time<=time`
+	pub fn partition_point(block:&Block,pred:impl Fn(f64)->bool)->Self{
+		Self([
+			block.input_events.partition_point(|event|pred(event.time)),
+			block.output_events.partition_point(|event|pred(event.time)),
+			block.sound_events.partition_point(|event|pred(event.time)),
+			block.world_events.partition_point(|event|pred(event.time)),
+			block.gravity_events.partition_point(|event|pred(event.time)),
+			block.run_events.partition_point(|event|pred(event.time)),
+			block.camera_events.partition_point(|event|pred(event.time)),
+			block.setting_events.partition_point(|event|pred(event.time)),
+		])
+	}
 	// compare an event at the head of the plan to the best event collected so far.
 	fn collect_event<E>(
 		&self,