sdbus++: Add server constructor from property-map

Add a constructor that takes a map of property-names to
values and initializes all properties in the map with those
values.

Change-Id: Id0eaa2ec43aed490719d12537e75c1278d290013
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/tools/sdbusplus/templates/interface.mako.server.hpp b/tools/sdbusplus/templates/interface.mako.server.hpp
index 440fcce..ca45c66 100644
--- a/tools/sdbusplus/templates/interface.mako.server.hpp
+++ b/tools/sdbusplus/templates/interface.mako.server.hpp
@@ -57,6 +57,16 @@
         using PropertiesVariant = sdbusplus::message::variant<
                 ${",\n                ".join(setOfPropertyTypes())}>;
 
+        /** @brief Constructor to initialize the object from a map of
+         *         properties.
+         *
+         *  @param[in] bus - Bus to attach to.
+         *  @param[in] path - Path to attach at.
+         *  @param[in] vals - Map of property name to value for initalization.
+         */
+        ${classname}(bus::bus& bus, const char* path,
+                     const std::map<std::string, PropertiesVariant>& vals);
+
     % endif
     % for m in interface.methods:
 ${ m.cpp_prototype(loader, interface=interface, ptype='header') }