ircd:Ⓜ️:event: Add std::string overloads to event get() suite.

include/ircd/m/event/get.h

@@ -13,21 +13,24 @@
 
 namespace ircd::m
 {
-	// Fetch the value for a single property of an event into the closure
+	// Fetch the value for a single property of an event into the closure.
 	bool get(std::nothrow_t, const event::idx &, const string_view &key, const event::fetch::view_closure &);
 	bool get(std::nothrow_t, const event::id &, const string_view &key, const event::fetch::view_closure &);
-
-	// Throws if event or property in that event not found
 	void get(const event::idx &, const string_view &key, const event::fetch::view_closure &);
 	void get(const event::id &, const string_view &key, const event::fetch::view_closure &);
 
-	// Copies value into buffer returning view (empty for not found)
+	// Copies value into buffer returning view.
 	const_buffer get(std::nothrow_t, const event::idx &, const string_view &key, const mutable_buffer &out);
 	const_buffer get(std::nothrow_t, const event::id &, const string_view &key, const mutable_buffer &out);
-
 	const_buffer get(const event::idx &, const string_view &key, const mutable_buffer &out);
 	const_buffer get(const event::id &, const string_view &key, const mutable_buffer &out);
 
+	// Allocates and copies into string.
+	std::string get(std::nothrow_t, const event::idx &, const string_view &key);
+	std::string get(std::nothrow_t, const event::id &, const string_view &key);
+	std::string get(const event::idx &, const string_view &key);
+	std::string get(const event::id &, const string_view &key);
+
 	template<class T>
 	typename std::enable_if<std::is_integral<T>::value, bool>::type
 	get(const event::idx &, const string_view &key, T &ret);

ircd/m_event.cc

@@ -521,6 +521,64 @@ ircd::m::cached(const event::idx &event_idx,
 // event/get.h
 //
 
+std::string
+ircd::m::get(const event::id &event_id,
+             const string_view &key)
+{
+	std::string ret;
+	get(event_id, key, [&ret]
+	(const string_view &value)
+	{
+		ret = value;
+	});
+
+	return ret;
+}
+
+std::string
+ircd::m::get(const event::idx &event_idx,
+             const string_view &key)
+{
+	std::string ret;
+	get(event_idx, key, [&ret]
+	(const string_view &value)
+	{
+		ret = value;
+	});
+
+	return ret;
+}
+
+std::string
+ircd::m::get(std::nothrow_t,
+             const event::id &event_id,
+             const string_view &key)
+{
+	std::string ret;
+	get(std::nothrow, event_id, key, [&ret]
+	(const string_view &value)
+	{
+		ret = value;
+	});
+
+	return ret;
+}
+
+std::string
+ircd::m::get(std::nothrow_t,
+             const event::idx &event_idx,
+             const string_view &key)
+{
+	std::string ret;
+	get(std::nothrow, event_idx, key, [&ret]
+	(const string_view &value)
+	{
+		ret = value;
+	});
+
+	return ret;
+}
+
 ircd::const_buffer
 ircd::m::get(const event::id &event_id,
              const string_view &key,