From f9e8ea78bf746bfa5d4b69dd4f81b5b5e870be90 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Mon, 20 Apr 2015 17:13:14 +1000
Subject: [PATCH] variadic: add index helper type

---
 Makefile.am  |  3 +++
 variadic.cpp | 19 +++++++++++++++++++
 variadic.hpp | 39 +++++++++++++++++++++++++++++++++++++++
 variadic.ipp | 29 +++++++++++++++++++++++++++++
 4 files changed, 90 insertions(+)
 create mode 100644 variadic.cpp
 create mode 100644 variadic.hpp
 create mode 100644 variadic.ipp

diff --git a/Makefile.am b/Makefile.am
index d5a6bfc3..c7cead25 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -186,6 +186,9 @@ UTIL_FILES   =		\
     types/traits.hpp	\
     uri.hpp		\
     uri.cpp		\
+    variadic.cpp	\
+    variadic.hpp	\
+    variadic.ipp	\
     vector.cpp		\
     vector.hpp		\
     version.cpp		\
diff --git a/variadic.cpp b/variadic.cpp
new file mode 100644
index 00000000..30b9e4e0
--- /dev/null
+++ b/variadic.cpp
@@ -0,0 +1,19 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright 2015 Danny Robson <danny@nerdcruft.net>
+ */
+
+#include "variadic.hpp"
+
+// Make sure _someone_ includes the header for syntax checking
diff --git a/variadic.hpp b/variadic.hpp
new file mode 100644
index 00000000..b4f8eb0c
--- /dev/null
+++ b/variadic.hpp
@@ -0,0 +1,39 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright 2015 Danny Robson <danny@nerdcruft.net>
+ */
+
+#ifndef __UTIL_VARIADIC_HPP
+#define __UTIL_VARIADIC_HPP
+
+#include <cstddef>
+
+namespace util {
+    template <size_t ...N>
+    struct indices
+    {
+        typedef indices<N..., sizeof...(N)> next;
+    };
+
+
+    template <size_t N>
+    struct make_indices
+    {
+        typedef typename make_indices<N-1>::type::next type;
+    };
+}
+
+#include "variadic.ipp"
+
+#endif
diff --git a/variadic.ipp b/variadic.ipp
new file mode 100644
index 00000000..931c88a4
--- /dev/null
+++ b/variadic.ipp
@@ -0,0 +1,29 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright 2015 Danny Robson <danny@nerdcruft.net>
+ */
+
+#ifdef __UTIL_VARIADIC_IPP
+#error
+#endif
+#define __UTIL_VARIADIC_IPP
+
+
+namespace util {
+    template<>
+    struct make_indices<0>
+    {
+        typedef indices<> type;
+    };
+}