Support identity for boost::result_of pre C++11

2022-01-12 01:46:04 -05:00
parent 0be868143d
commit 075c2e089a
4 changed files with 71 additions and 0 deletions
@@ -34,6 +34,26 @@ struct identity {
        return value;
    }
 #endif
+
+    template<class>
+    struct result { };
+
+    template<class T>
+    struct result<identity(T&)> {
+        typedef T& type;
+    };
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+    template<class T>
+    struct result<identity(T)> {
+        typedef T&& type;
+    };
+
+    template<class T>
+    struct result<identity(T&&)> {
+        typedef T&& type;
+    };
+#endif
 };

 } // boost