From 0d4013536aae71daa774895715af2baf3309708a Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Thu, 27 Sep 2018 17:00:15 -0700
Subject: [PATCH] ircd::util: Add overload to ircd::string() to pubsetbuf() a
 provided buffer.

---
 include/ircd/util/string.h | 13 +++++++++++++
 include/ircd/util/util.h   |  2 +-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/include/ircd/util/string.h b/include/ircd/util/string.h
index c458bdecc..45ffc2037 100644
--- a/include/ircd/util/string.h
+++ b/include/ircd/util/string.h
@@ -32,6 +32,19 @@ string(const T &s)
 	return ss.str();
 }
 
+/// Alternative to ircd::string() using a provided buffer for the
+/// std::stringstream to avoid allocating one.
+template<class T>
+auto
+string(const mutable_buffer &buf,
+       const T &s)
+{
+	std::stringstream ss;
+	pubsetbuf(ss, buf);
+	ss << s;
+	return ss.str();
+}
+
 inline auto
 string(const char *const &buf,
        const size_t &size)
diff --git a/include/ircd/util/util.h b/include/ircd/util/util.h
index c56cb273d..932f930dd 100644
--- a/include/ircd/util/util.h
+++ b/include/ircd/util/util.h
@@ -46,8 +46,8 @@ namespace ircd
 #include "tuple.h"
 #include "timer.h"
 #include "life_guard.h"
-#include "string.h"
 #include "pubsetbuf.h"
+#include "string.h"
 #include "pointers.h"
 #include "iterator.h"
 #include "nothrow.h"