From fbc78c9c60a2182b18355a42c8d82e5f7b58a258 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Wed, 18 Apr 2018 15:09:13 -0700
Subject: [PATCH] ircd::m: Add head_idx(room) convenience to get one head event
 idx.

---
 include/ircd/m/room.h |  4 ++++
 ircd/m/room.cc        | 13 +++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/ircd/m/room.h b/include/ircd/m/room.h
index b1ee4c85c..82d2ed238 100644
--- a/include/ircd/m/room.h
+++ b/include/ircd/m/room.h
@@ -43,6 +43,10 @@ namespace ircd::m
 	id::event::buf head(std::nothrow_t, const id::room &);
 	id::event::buf head(const id::room &);
 
+	// [GET] Current Event idx (non-locking) (one only)
+	event::idx head_idx(std::nothrow_t, const id::room &);
+	event::idx head_idx(const id::room &);
+
 	// [GET] Current Event depth (non-locking) (one only)
 	int64_t depth(std::nothrow_t, const id::room &);
 	int64_t depth(const id::room &);
diff --git a/ircd/m/room.cc b/ircd/m/room.cc
index 570c40e1c..9d1e28e75 100644
--- a/ircd/m/room.cc
+++ b/ircd/m/room.cc
@@ -23,6 +23,19 @@ ircd::m::depth(std::nothrow_t,
 	return std::get<int64_t>(top(std::nothrow, room_id));
 }
 
+ircd::m::event::idx
+ircd::m::head_idx(const id::room &room_id)
+{
+	return std::get<event::idx>(top(room_id));
+}
+
+ircd::m::event::idx
+ircd::m::head_idx(std::nothrow_t,
+                  const id::room &room_id)
+{
+	return std::get<event::idx>(top(std::nothrow, room_id));
+}
+
 ircd::m::event::id::buf
 ircd::m::head(const id::room &room_id)
 {