Initial commit

include/ftxui/dom/take_any_args.hpp

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+// Copyright 2020 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.
+#ifndef FTXUI_DOM_TAKE_ANY_ARGS_HPP
+#define FTXUI_DOM_TAKE_ANY_ARGS_HPP
+
+// IWYU pragma: private, include "ftxui/dom/elements.hpp"
+#include <type_traits>
+
+namespace ftxui {
+
+template <class T>
+void Merge(Elements& /*container*/, T /*element*/) {}
+
+template <>
+inline void Merge(Elements& container, Element element) {
+  container.push_back(std::move(element));
+}
+
+template <>
+inline void Merge(Elements& container, Elements elements) {
+  for (auto& element : elements)
+    container.push_back(std::move(element));
+}
+
+// Turn a set of arguments into a vector.
+template <class... Args>
+Elements unpack(Args... args) {
+  std::vector<Element> vec;
+  (Merge(vec, std::move(args)), ...);
+  return vec;
+}
+
+// Make |container| able to take any number of argments.
+#define TAKE_ANY_ARGS(container)                               \
+  template <class... Args>                                     \
+  Element container(Args... children) {                        \
+    return container(unpack(std::forward<Args>(children)...)); \
+  }
+
+TAKE_ANY_ARGS(vbox)
+TAKE_ANY_ARGS(hbox)
+TAKE_ANY_ARGS(dbox)
+TAKE_ANY_ARGS(hflow)
+}  // namespace ftxui
+
+#endif  // FTXUI_DOM_TAKE_ANY_ARGS_HPP