From bf8edc374d0c199ae197c4939c059b84c6c8e24f Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Tue, 18 Oct 2016 19:50:21 +0100
Subject: Add enable_if to catch some conversion madness

---
 libdbpp/command.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libdbpp/command.h b/libdbpp/command.h
index ae18158..8fbff4e 100644
--- a/libdbpp/command.h
+++ b/libdbpp/command.h
@@ -5,6 +5,7 @@
 #include <boost/date_time/posix_time/posix_time_types.hpp>
 #include <boost/shared_ptr.hpp>
 #include <visibility.h>
+#include <type_traits>
 #include "error.h"
 
 namespace DB {
@@ -64,8 +65,9 @@ namespace DB {
 
 #define OPTWRAPPER(func) \
 			template<typename O> \
-			inline void func(unsigned int i, const O & o) { \
-				if (o) \
+			inline typename std::enable_if<std::is_constructible<bool, const O &>::value>::type func(unsigned int i, const O & o) { \
+				bool nn(o); \
+				if (nn) \
 					func(i, *o); \
 				else \
 					bindNull(i); \
-- 
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