From 2ac5d968524e5c7b55e579a100d74bc01b23b616 Mon Sep 17 00:00:00 2001
From: Richard Clamp <richardc@unixbeard.net>
Date: Wed, 26 Nov 2014 13:50:51 +0000
Subject: [PATCH] Fix compatibility with boost 1.56+

In boost 1.56 the optional library is no longer happy with the implicit
conversion from boost::optional<std::string> to bool, so we get the following
errors:

    valijson/include/valijson/schema.hpp:177:16: error: no viable conversion from 'const boost::optional<std::string>' to 'bool'
            return id;
                   ^~

    valijson/include/valijson/schema.hpp:188:16: error: no viable conversion from 'const boost::optional<std::string>' to 'bool'
                    return title;
                           ^~~~~
    2 errors generated.

Here we explicitly test against boost::none instead.
---
 include/valijson/schema.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/valijson/schema.hpp b/include/valijson/schema.hpp
index fc4a7b9..47a13c8 100644
--- a/include/valijson/schema.hpp
+++ b/include/valijson/schema.hpp
@@ -174,7 +174,7 @@ public:
      */
     bool hasId() const
     {
-        return id;
+        return id != boost::none;
     }
 
     /**
@@ -185,7 +185,7 @@ public:
      */
     bool hasTitle() const
     {
-        return title;
+        return title != boost::none;
     }
 
     std::string resolveUri(const std::string &relative) const