From edd75b3b4eb4e43f4df7dfe6470989f22e4d3bcc Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Tue, 25 Jun 2019 14:40:25 -0700
Subject: [PATCH] Don't return a blank span when offset==size()

---
 common/alspan.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/common/alspan.h b/common/alspan.h
index 6b0dc7d6..b7995121 100644
--- a/common/alspan.h
+++ b/common/alspan.h
@@ -255,7 +255,7 @@ public:
 
     constexpr span subspan(size_t offset, size_t count=dynamic_extent) const
     {
-        return (offset >= size()) ? span{} :
+        return (offset > size()) ? span{} :
             (count >= size()-offset) ? span{mData+offset, mDataEnd} :
             span{mData+offset, mData+offset+count};
     }
@@ -282,7 +282,7 @@ constexpr inline auto span<T,E>::last(size_t count) const -> span<element_type,d
 template<typename T, size_t E>
 constexpr inline auto span<T,E>::subspan(size_t offset, size_t count) const -> span<element_type,dynamic_extent>
 {
-    return (offset >= size()) ? span<element_type>{} :
+    return (offset > size()) ? span<element_type>{} :
         (count >= size()-offset) ? span<element_type>{mData+offset, mData+extent} :
         span<element_type>{mData+offset, mData+offset+count};
 }