App: use contains() instead of count()

src/App/DynamicProperty.cpp

@@ -256,9 +256,15 @@ bool DynamicProperty::addProperty(Property* prop)
         return false;
     }
     auto& index = props.get<0>();
+#if BOOST_VERSION < 107500
     if (index.count(prop->getName())) {
         return false;
     }
+#else
+    if (index.contains(prop->getName())) {
+        return false;
+    }
+#endif
     index.emplace(prop,
                   std::string(),
                   prop->getName(),

src/App/Transactions.cpp

@@ -141,7 +141,11 @@ bool Transaction::isEmpty() const
 
 bool Transaction::hasObject(const TransactionalObject* Obj) const
 {
+#if BOOST_VERSION < 107500
     return !!_Objects.get<1>().count(Obj);
+#else
+    return !!_Objects.get<1>().contains(Obj);
+#endif
 }
 
 void Transaction::addOrRemoveProperty(TransactionalObject* Obj, const Property* pcProp, bool add)