From 7c09123a3c7990249f40372d867a52eec5958ad8 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Wed, 20 Feb 2019 13:07:40 -0800
Subject: [PATCH] ircd::m::room::state: Add a type prefix-domain iteration to
 state interface.

---
 include/ircd/m/room/state.h |  2 ++
 ircd/m_room.cc              | 20 ++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/ircd/m/room/state.h b/include/ircd/m/room/state.h
index aeacac149..c0319737b 100644
--- a/include/ircd/m/room/state.h
+++ b/include/ircd/m/room/state.h
@@ -28,6 +28,7 @@ struct ircd::m::room::state
 	using keys_bool = std::function<bool (const string_view &)>;
 	using types = std::function<void (const string_view &)>;
 	using types_bool = std::function<bool (const string_view &)>;
+	IRCD_STRONG_TYPEDEF(string_view, type_prefix)
 
 	static conf::item<bool> disable_history;
 	static conf::item<size_t> readahead_size;
@@ -45,6 +46,7 @@ struct ircd::m::room::state
 	// Iterate the state
 	bool for_each(const types_bool &) const;
 	void for_each(const types &) const;
+	bool for_each(const type_prefix &pref, const types_bool &) const;
 	bool for_each(const string_view &type, const keys_bool &view) const;
 	void for_each(const string_view &type, const keys &) const;
 	bool for_each(const string_view &type, const string_view &lower_bound, const keys_bool &view) const;
diff --git a/ircd/m_room.cc b/ircd/m_room.cc
index 31b6ff7f9..f2d3b0b8d 100644
--- a/ircd/m_room.cc
+++ b/ircd/m_room.cc
@@ -1468,6 +1468,26 @@ const
 	return true;
 }
 
+bool
+ircd::m::room::state::for_each(const type_prefix &prefix,
+                               const types_bool &closure)
+const
+{
+	bool ret(true), cont(true);
+	for_each(types_bool([&prefix, &closure, &ret, &cont]
+	(const string_view &type)
+	{
+		if(!startswith(type, string_view(prefix)))
+			return cont;
+
+		cont = false;
+		ret = closure(type);
+		return ret;
+	}));
+
+	return ret;
+}
+
 void
 ircd::m::room::state::for_each(const types &closure)
 const