trying out distortos

1 files changed, 73 insertions, 0 deletions

diff --git a/include/estd/apply.hpp b/include/estd/apply.hpp
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+++ b/include/estd/apply.hpp
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+/**
+ * \file
+ * \brief apply() header
+ *
+ * \author Copyright (C) 2015 Kamil Szczygiel http://www.distortec.com http://www.freddiechopin.info
+ *
+ * \par License
+ * This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not
+ * distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef ESTD_APPLY_HPP_
+#define ESTD_APPLY_HPP_
+
+#include "estd/IntegerSequence.hpp"
+#include "estd/invoke.hpp"
+
+#include <tuple>
+
+namespace estd
+{
+
+namespace internal
+{
+
+/**
+ * \brief Implementation of apply()
+ *
+ * \tparam Function is the function object that will be invoked
+ * \tparam Tuple is the type of tuple of arguments
+ * \tparam Indexes is a sequence of std::size_t indexes for \a Tuple
+ *
+ * \param [in] function is the function object that will be executed
+ * \param [in] tuple is the tuple of arguments
+ *
+ * \return value returned by call to \a function with arguments from \a tuple
+ */
+
+template<typename Function, typename Tuple, std::size_t... Indexes>
+constexpr auto apply(Function&& function, Tuple&& tuple, estd::IndexSequence<Indexes...>) ->
+		decltype(estd::invoke(std::forward<Function>(function), std::get<Indexes>(std::forward<Tuple>(tuple))...))
+{
+	return estd::invoke(std::forward<Function>(function), std::get<Indexes>(std::forward<Tuple>(tuple))...);
+}
+
+} // namespace internal
+
+/**
+ * \brief Invokes callable object with a tuple of arguments.
+ *
+ * Implementation inspired by http://en.cppreference.com/w/cpp/experimental/apply
+ *
+ * \tparam Function is the function object that will be invoked
+ * \tparam Tuple is the type of tuple of arguments
+ *
+ * \param [in] function is the function object that will be executed
+ * \param [in] tuple is the tuple of arguments
+ *
+ * \return value returned by call to \a function with arguments from \a tuple
+ */
+
+template <typename Function, typename Tuple>
+constexpr auto apply(Function&& function, Tuple&& tuple) ->
+		decltype(internal::apply(std::forward<Function>(function), std::forward<Tuple>(tuple),
+				estd::MakeIndexSequence<std::tuple_size<typename std::decay<Tuple>::type>{}>{}))
+{
+	return internal::apply(std::forward<Function>(function), std::forward<Tuple>(tuple),
+			estd::MakeIndexSequence<std::tuple_size<typename std::decay<Tuple>::type>{}>{});
+}
+
+}	// namespace estd
+
+#endif	// ESTD_APPLY_HPP_