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+/*
+ * ngtcp2
+ *
+ * Copyright (c) 2017 ngtcp2 contributors
+ * Copyright (c) 2015 ngttp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef TEMPLATE_H
+#define TEMPLATE_H
+
+#include <functional>
+#include <utility>
+#include <type_traits>
+
+// inspired by <http://blog.korfuri.fr/post/go-defer-in-cpp/>, but our
+// template can take functions returning other than void.
+template <typename F, typename... T> struct Defer {
+  Defer(F &&f, T &&...t)
+      : f(std::bind(std::forward<F>(f), std::forward<T>(t)...)) {}
+  Defer(Defer &&o) noexcept : f(std::move(o.f)) {}
+  ~Defer() { f(); }
+
+  using ResultType = std::invoke_result_t<F, T...>;
+  std::function<ResultType()> f;
+};
+
+template <typename F, typename... T> Defer<F, T...> defer(F &&f, T &&...t) {
+  return Defer<F, T...>(std::forward<F>(f), std::forward<T>(t)...);
+}
+
+template <typename T, size_t N> constexpr size_t array_size(T (&)[N]) {
+  return N;
+}
+
+template <typename T, size_t N> constexpr size_t str_size(T (&)[N]) {
+  return N - 1;
+}
+
+// User-defined literals for K, M, and G (powers of 1024)
+
+constexpr unsigned long long operator"" _k(unsigned long long k) {
+  return k * 1024;
+}
+
+constexpr unsigned long long operator"" _m(unsigned long long m) {
+  return m * 1024 * 1024;
+}
+
+constexpr unsigned long long operator"" _g(unsigned long long g) {
+  return g * 1024 * 1024 * 1024;
+}
+
+#endif // TEMPLATE_H