Add methods to return property variant

Create methods to return a property variant for use where the overloaded
comparison operations are needed against a property value stored as a
variant.

Tested:
    A property is looked up and returned as the given variant type

Change-Id: Iab557781a3ab9e33d3595ad69db5544a25efe2eb
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>

1 files changed, 77 insertions, 0 deletions

diff --git a/sdbusplus.hpp b/sdbusplus.hpp
index 0c70b9c..454fde8 100644
--- a/sdbusplus.hpp
+++ b/sdbusplus.hpp
@@ -245,6 +245,43 @@ class SDBusPlus
                     property);
         }
 
+        /** @brief Get a property variant with mapper lookup. */
+        template <typename Variant>
+        static auto getPropertyVariant(
+            sdbusplus::bus::bus& bus,
+            const std::string& path,
+            const std::string& interface,
+            const std::string& property)
+        {
+            using namespace std::literals::string_literals;
+
+            auto msg = callMethod(
+                    bus,
+                    getService(bus, path, interface),
+                    path,
+                    "org.freedesktop.DBus.Properties"s,
+                    "Get"s,
+                    interface,
+                    property);
+            Variant value;
+            msg.read(value);
+            return value;
+        }
+
+        /** @brief Get a property variant with mapper lookup. */
+        template <typename Variant>
+        static auto getPropertyVariant(
+            const std::string& path,
+            const std::string& interface,
+            const std::string& property)
+        {
+            return getPropertyVariant<Variant>(
+                    getBus(),
+                    path,
+                    interface,
+                    property);
+        }
+
         /** @brief Get a property without mapper lookup. */
         template <typename Property>
         static auto getProperty(
@@ -285,6 +322,46 @@ class SDBusPlus
                     property);
         }
 
+        /** @brief Get a property variant without mapper lookup. */
+        template <typename Variant>
+        static auto getPropertyVariant(
+            sdbusplus::bus::bus& bus,
+            const std::string& service,
+            const std::string& path,
+            const std::string& interface,
+            const std::string& property)
+        {
+            using namespace std::literals::string_literals;
+
+            auto msg = callMethod(
+                    bus,
+                    service,
+                    path,
+                    "org.freedesktop.DBus.Properties"s,
+                    "Get"s,
+                    interface,
+                    property);
+            Variant value;
+            msg.read(value);
+            return value;
+        }
+
+        /** @brief Get a property variant without mapper lookup. */
+        template <typename Variant>
+        static auto getPropertyVariant(
+            const std::string& service,
+            const std::string& path,
+            const std::string& interface,
+            const std::string& property)
+        {
+            return getPropertyVariant<Variant>(
+                    getBus(),
+                    service,
+                    path,
+                    interface,
+                    property);
+        }
+
         /** @brief Set a property with mapper lookup. */
         template <typename Property>
         static void setProperty(