From 3998d6154ef8cd9e284b9d1c165cd9fd299f1fd1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonathan=20M=C3=BCller?= <git@foonathan.net>
Date: Mon, 3 Jul 2017 08:44:35 +0200
Subject: [PATCH] Allow arrays as range type for parse_files()

---
 include/cppast/parser.hpp | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/include/cppast/parser.hpp b/include/cppast/parser.hpp
index 8e7ea0a..241930d 100644
--- a/include/cppast/parser.hpp
+++ b/include/cppast/parser.hpp
@@ -149,6 +149,33 @@ namespace cppast
         type_safe::object_ref<const cpp_entity_index> idx_;
     };
 
+    namespace detail
+    {
+        struct std_begin
+        {
+        };
+        struct adl_begin : std_begin
+        {
+        };
+        struct member_begin : adl_begin
+        {
+        };
+
+        template <class Range>
+        auto get_value_type_impl(member_begin, Range&& r)
+            -> decltype(std::forward<Range>(r).begin());
+
+        template <class Range>
+        auto get_value_type_impl(adl_begin, Range&& r) -> decltype(begin(std::forward<Range>(r)));
+
+        template <class Range>
+        auto get_value_type_impl(std_begin, Range&& r)
+            -> decltype(std::begin(std::forward<Range>(r)));
+
+        template <class Range>
+        using value_type = decltype(*get_value_type_impl(member_begin{}, std::declval<Range>()));
+    } // namespace detail
+
     /// Parses multiple files using a given `FileParser`.
     ///
     /// \effects Will call the `parse()` function for each path specified in the `file_names`,
@@ -166,7 +193,7 @@ namespace cppast
     template <class FileParser, class Range, class Configuration>
     auto parse_files(FileParser& parser, Range&& file_names, const Configuration& get_config) ->
         typename std::enable_if<std::is_same<typename std::decay<decltype(get_config(
-                                                 *std::forward<Range>(file_names).begin()))>::type,
+                                                 std::declval<detail::value_type<Range>>()))>::type,
                                              typename FileParser::config>::value>::type
     {
         for (auto&& file : std::forward<Range>(file_names))