Make it possible to apply when_seq to iterators

include/continuable/continuable-compositions.hpp

@@ -33,8 +33,14 @@
 
 #include <utility>
 
-#include <continuable/continuable-base.hpp>
+#include <continuable/detail/composition-all.hpp>
+#include <continuable/detail/composition-any.hpp>
+#include <continuable/detail/composition-seq.hpp>
+#include <continuable/detail/composition.hpp>
 #include <continuable/detail/features.hpp>
+#include <continuable/detail/range.hpp>
+#include <continuable/detail/traits.hpp>
+#include <continuable/detail/util.hpp>
 
 namespace cti {
 /// Connects the given continuables with an *all* logic.
@@ -71,18 +77,29 @@ auto when_any(Continuables&&... continuables) {
 
 /// Connects the given continuables with a *seq* logic.
 ///
-/// \param continuables The continuable_base objects to connect.
+/// \param args The continuable_base objects to connect.
 ///        Requires at least 2 objects to connect.
 ///
 /// \see continuable_base::operator>> for details.
 ///
 /// \since 1.1.0
-template <typename... Continuables>
-auto when_seq(Continuables&&... continuables) {
-  static_assert(sizeof...(continuables) >= 2,
-                "Requires at least 2 continuables!");
-  return CONTINUABLE_FOLD_EXPRESSION(
-      >>, std::forward<Continuables>(continuables)...);
+template <typename... Args>
+auto when_seq(Args&&... args) {
+  return detail::composition::apply_composition(
+      detail::composition::composition_strategy_seq_tag{},
+      std::forward<Args>(args)...);
+}
+
+/// bla
+///
+/// \copydetail when_seq
+///
+/// \since 3.0.0
+template <
+    typename Iterator,
+    std::enable_if_t<detail::range::is_iterator<Iterator>::value>* = nullptr>
+auto when_seq(Iterator begin, Iterator end) {
+  return when_seq(detail::range::persist_range(begin, end));
 }
 } // namespace cti
 

include/continuable/detail/range.hpp

@@ -0,0 +1,65 @@
+
+/*
+
+                        /~` _  _ _|_. _     _ |_ | _
+                        \_,(_)| | | || ||_|(_||_)|(/_
+
+                    https://github.com/Naios/continuable
+                                   v3.0.0
+
+  Copyright(c) 2015 - 2018 Denis Blank <denis.blank at outlook dot com>
+
+  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 CONTINUABLE_DETAIL_RANGE_HPP_INCLUDED
+#define CONTINUABLE_DETAIL_RANGE_HPP_INCLUDED
+
+#include <iterator>
+#include <type_traits>
+#include <vector>
+
+#include <continuable/detail/traits.hpp>
+
+namespace cti {
+namespace detail {
+namespace range {
+/// Deduces to a true_type if the given type is an interator
+template <typename T, typename = void>
+struct is_iterator : std::false_type {};
+template <typename T>
+struct is_iterator<T,
+                   traits::void_t<typename std::iterator_traits<T>::value_type>>
+    : std::true_type {};
+
+/// Moves to content of the given iterators to a persistent storage
+template <typename Iterator>
+auto persist_range(Iterator begin, Iterator end) {
+  std::vector<typename std::iterator_traits<Iterator>::value_type> storage;
+
+  storage.insert(storage.end(), std::make_move_iterator(begin),
+                 std::make_move_iterator(end));
+
+  return storage; // RVO
+}
+} // namespace range
+} // namespace detail
+} // namespace cti
+
+#endif // CONTINUABLE_DETAIL_RANGE_HPP_INCLUDED

test/playground/test-playground.cpp

@@ -124,8 +124,7 @@ void old() {
 int main(int, char**) {
   using namespace cti::detail;
 
-  apply_composition(
-      composition::composition_strategy_seq_tag{},
+  cti::when_seq(
       cti::make_ready_continuable(0, 1), 2,
       std::vector<cti::continuable<int>>{cti::make_ready_continuable(8),
                                          cti::make_ready_continuable(9)},
@@ -134,4 +133,12 @@ int main(int, char**) {
         // ...
         util::unused(a0, a1, a2, o1, o2);
       });
+
+  std::vector<cti::continuable<int>> v{cti::make_ready_continuable(8),
+                                       cti::make_ready_continuable(9)};
+
+  cti::when_seq(v.begin(), v.end()).then([](auto o2) {
+    // ...
+    util::unused(o2);
+  });
 }