From 0d497738cea3ed564ba0353d950368031c65bdb0 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Mon, 17 Feb 2020 14:29:50 +1100
Subject: [PATCH] iterator: add less-equal operators for libstdc++-10
 compatibility

---
 iterator/dereference.hpp | 7 +++++++
 iterator/iota.hpp        | 1 +
 2 files changed, 8 insertions(+)

diff --git a/iterator/dereference.hpp b/iterator/dereference.hpp
index 7192939c..daf73953 100644
--- a/iterator/dereference.hpp
+++ b/iterator/dereference.hpp
@@ -52,6 +52,13 @@ namespace cruft::iterator {
         }
 
 
+        decltype(auto)
+        operator<= (dereference_adapter const &rhs) const
+        {
+            return m_cursor <= rhs.m_cursor;
+        }
+
+
         //---------------------------------------------------------------------
         // Iterator movement operations
         dereference_adapter&
diff --git a/iterator/iota.hpp b/iterator/iota.hpp
index 5674ccea..dad86f0c 100644
--- a/iterator/iota.hpp
+++ b/iterator/iota.hpp
@@ -60,6 +60,7 @@ namespace cruft::iterator {
 
             constexpr bool operator!= (iterator const &rhs) const noexcept { return m_value != rhs.m_value; }
             constexpr bool operator== (iterator const &rhs) const noexcept { return m_value == rhs.m_value; }
+            constexpr bool operator<= (iterator const &rhs) const noexcept { return m_value <= rhs.m_value; }
 
         private:
             ValueT m_value;