Imported Upstream version 1.1.0

[platform/upstream/iotivity.git] / resource / include / OCUtilities.h

diff --git a/resource/include/OCUtilities.h b/resource/include/OCUtilities.h
index 87bdf35..1c17c10 100644 (file)
--- a/resource/include/OCUtilities.h
+++ b/resource/include/OCUtilities.h
@@ -18,8 +18,8 @@
 //
 //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 
-#ifndef _INTEL_OCUTILITIES_H_
-#define _INTEL_OCUTILITIES_H_
+#ifndef OC_UTILITIES_H_
+#define OC_UTILITIES_H_
 
 #include <map>
 #include <vector>
@@ -106,12 +106,42 @@ namespace OC
     template<typename T>
     struct is_vector<T,
         typename std::enable_if<
-            std::is_same<T, std::vector<typename T::value_type, typename T::allocator_type>>::value
+            std::is_same<T, std::vector<typename T::value_type, typename T::allocator_type> >::value
         >::type
     >
     {
         constexpr static bool value = true;
     };
+
+    // type trait to remove the first type from a parameter-packed list
+    template <typename T>
+    struct remove_first;
+
+    // specialization that does all the work
+    template<template <typename...> class Base, typename T, typename ...Rest>
+    struct remove_first< Base<T, Rest...> >
+    {
+        typedef Base<Rest...> type;
+    };
+
+    // type trait that will only pass if ToTest is in the parameter pack of T2
+    template<typename ToTest, typename T2>
+    struct is_component;
+
+    // specialization to handle the single-item case
+    template<typename ToTest, template <typename...> class Base, typename T>
+    struct is_component<ToTest, Base<T> >
+    {
+        static constexpr bool value = std::is_same<ToTest, T>::value;
+    };
+
+    // Recursive specialization to handle cases with multiple values
+    template<typename ToTest, template <typename...> class Base, typename T, typename ...Rest>
+    struct is_component<ToTest, Base<T, Rest...> >
+    {
+        static constexpr bool value = std::is_same<ToTest, T>::value
+            || is_component<ToTest, Base<Rest...> >::value;
+    };
 } // namespace OC
 
 #endif