From 7550ad7c23eda3cc1fcc22aa09690264b3ae4b87 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Thu, 12 Mar 2020 12:44:42 +1100
Subject: [PATCH] concepts: add cbegin/cend requirements to iterable

---
 concepts.hpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/concepts.hpp b/concepts.hpp
index 4a9aa9d1..f5476e1b 100644
--- a/concepts.hpp
+++ b/concepts.hpp
@@ -293,8 +293,10 @@ namespace cruft::concepts {
     template <typename T>
     concept iterable = requires (T t)
     {
-        { std::begin (t) } -> legacy_iterator;
-        { std::end   (t) } -> legacy_iterator;
+        { std::begin  (t) } -> legacy_iterator;
+        { std::end    (t) } -> legacy_iterator;
+        { std::cbegin (t) } -> legacy_iterator;
+        { std::cend   (t) } -> legacy_iterator;
     };