From 25cc1376b0b080106ee180d0cad7c13dcec8ef67 Mon Sep 17 00:00:00 2001
From: Vladimir Chebotarev <chebotarev@yandex-team.ru>
Date: Fri, 12 Feb 2016 11:52:48 +0300
Subject: [PATCH] libcommon: make_array_n clarification [METR-19529]

---
 libs/libcommon/include/ext/make_array_n.hpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libs/libcommon/include/ext/make_array_n.hpp b/libs/libcommon/include/ext/make_array_n.hpp
index a2749e21ff4..c494a186074 100644
--- a/libs/libcommon/include/ext/make_array_n.hpp
+++ b/libs/libcommon/include/ext/make_array_n.hpp
@@ -4,6 +4,11 @@
 #include <type_traits>
 #include <array>
 
+
+/** \brief Produces std::array of specified size, containing copies of provided object.
+  *	Copy is performed N-1 times, and the last element is being moved.
+  * This helper allows to initialize std::array in place.
+  */
 namespace ext
 {
 
@@ -13,6 +18,7 @@ namespace ext
 		template<std::size_t size, typename T, std::size_t... indexes>
 		constexpr auto make_array_n_impl(T && value, std::index_sequence<indexes...>)
 		{
+			/// Comma is used to make N-1 copies of value
 			return std::array<std::decay_t<T>, size>{ (static_cast<void>(indexes), value)..., std::forward<T>(value) };
 		}