add operator+(int, iterator) overload (#30, #31, thanks @Crzyrndm)

martinmoene · Oct 16, 2023 · 42cc095 · 42cc095
1 parent 2c6ae83
commit 42cc095
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diff --git a/include/nonstd/ring_span.hpp b/include/nonstd/ring_span.hpp
@@ -1104,6 +1104,12 @@ inline ring_iterator<RS,C> operator+( ring_iterator<RS,C> it, int i ) nsrs_noexc
     it += i; return it;
 }
 
+template< class RS, bool C >
+inline ring_iterator<RS,C> operator+(  int i, ring_iterator<RS,C> it ) nsrs_noexcept
+{
+    it += i; return it;
+}
+
 template< class RS, bool C >
 inline ring_iterator<RS,C> operator-( ring_iterator<RS,C> it, int i ) nsrs_noexcept
 {

diff --git a/test/ring-span.t.cpp b/test/ring-span.t.cpp
@@ -944,6 +944,7 @@ CASE( "ring_iterator: Allows to offset iterator (+)" " [extension]" )
     ring_span<int>::iterator pos = rs.begin();
 
     EXPECT( *(pos + 2) == arr[2] );
+    EXPECT( *(2 + pos) == arr[2] );
 #endif
 }