From 57d975bc4c9c3d76bce59ee7462a6e94487c7e82 Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@math.tamu.edu>
Date: Thu, 21 Aug 2014 13:26:15 -0500
Subject: [PATCH] Use an explicit cast when need a bool from optional<...>.
 source/base/parameter_handler.cc

The implicit cast was previously allowed, but newer versions of BOOST together with C++11 mark
the cast as 'explicit', and it fails in the current context.
---
 source/base/parameter_handler.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/base/parameter_handler.cc b/source/base/parameter_handler.cc
index a81e36349b..4f5f4e35a2 100644
--- a/source/base/parameter_handler.cc
+++ b/source/base/parameter_handler.cc
@@ -1275,7 +1275,7 @@ ParameterHandler::demangle (const std::string &s)
 bool
 ParameterHandler::is_parameter_node (const boost::property_tree::ptree &p)
 {
-  return (p.get_optional<std::string>("value"));
+  return static_cast<bool>(p.get_optional<std::string>("value"));
 }
 
 
-- 
2.39.5