fix "no viable conversion from ... to 'bool'"

4 files changed, 4 insertions, 4 deletions

diff --git a/src/account.h b/src/account.h
index d1377c39..4a4041b7 100644
--- a/src/account.h
+++ b/src/account.h
@@ -261,7 +261,7 @@ public:
   mutable optional<xdata_t> xdata_;
 
   bool has_xdata() const {
-    return xdata_;
+    return xdata_ != NULL;
   }
   void clear_xdata();
   xdata_t& xdata() {
diff --git a/src/item.h b/src/item.h
index beb32a04..d194ac07 100644
--- a/src/item.h
+++ b/src/item.h
@@ -191,7 +191,7 @@ public:
   static bool use_aux_date;
 
   virtual bool has_date() const {
-    return _date;
+    return _date != NULL;
   }
 
   virtual date_t date() const {
diff --git a/src/post.h b/src/post.h
index c2f77b32..c4fc3827 100644
--- a/src/post.h
+++ b/src/post.h
@@ -205,7 +205,7 @@ public:
   mutable optional<xdata_t> xdata_;
 
   bool has_xdata() const {
-    return xdata_;
+    return xdata_ != NULL;
   }
   void clear_xdata() {
     xdata_ = none;
diff --git a/src/times.h b/src/times.h
index 2a5b9277..d2f7bb19 100644
--- a/src/times.h
+++ b/src/times.h
@@ -568,7 +568,7 @@ public:
   void   stabilize(const optional<date_t>& date = none);
 
   bool   is_valid() const {
-    return start;
+    return start != NULL;
   }
 
   /** Find the current or next period containing date.  Returns false if