initial code repo

[stor4nfv.git] / src / ceph / src / common / function_signature.h

diff --git a/src/ceph/src/common/function_signature.h b/src/ceph/src/common/function_signature.h
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+++ b/src/ceph/src/common/function_signature.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Copied from:
+ * https://github.com/exclipy/inline_variant_visitor/blob/master/function_signature.hpp
+ * which apparently copied it from
+ * http://stackoverflow.com/questions/4771417/how-to-get-the-signature-of-a-c-bind-expression
+ */
+
+#ifndef FUNCTION_SIGNATURE_H
+#define FUNCTION_SIGNATURE_H
+
+#include <boost/mpl/pop_front.hpp>
+#include <boost/mpl/push_front.hpp>
+#include <boost/function_types/function_type.hpp>
+#include <boost/function_types/result_type.hpp>
+#include <boost/function_types/parameter_types.hpp>
+
+template <typename F>
+struct signature_of_member
+{
+    typedef typename boost::function_types::result_type<F>::type result_type;
+    typedef typename boost::function_types::parameter_types<F>::type parameter_types;
+    typedef typename boost::mpl::pop_front<parameter_types>::type base;
+    typedef typename boost::mpl::push_front<base, result_type>::type L;
+    typedef typename boost::function_types::function_type<L>::type type;
+};
+
+template <typename F, bool is_class>
+struct signature_of_impl
+{
+    typedef typename boost::function_types::function_type<F>::type type;
+};
+
+template <typename F>
+struct signature_of_impl<F, true>
+{
+    typedef typename signature_of_member<decltype(&F::operator())>::type type;
+};
+
+template <typename F>
+struct signature_of
+{
+    typedef typename signature_of_impl<F, boost::is_class<F>::value>::type type;
+};
+
+#endif