diff --git a/include/rexy/cx/utility.hpp b/include/rexy/cx/utility.hpp
index 8deb581..99adb77 100644
--- a/include/rexy/cx/utility.hpp
+++ b/include/rexy/cx/utility.hpp
@@ -34,6 +34,22 @@ namespace rexy::cx{
 			l = std::move(r);
 			r = std::move(tmp);
 		}
+		template<class Iter1, class Iter2>
+		constexpr Iter2 swap_ranges(Iter1 start1, Iter1 end1, Iter2 start2)
+			noexcept(noexcept(cx::swap(*start1, *start2)))
+		{
+			while(start1 != end1){
+				cx::swap(start1++, start2++);
+			}
+			return start2;
+		}
+		template<class T, size_t N>
+		constexpr void swap(T (&l)[N], T (&r)[N])
+			noexcept(noexcept(cx::swap(*l, *r)))
+		{
+			cx::swap_ranges(l, l+N, r);
+		}
+
 		template<class T, class U = T>
 		constexpr T exchange(T& l, U&& r)
 			noexcept(std::is_nothrow_assignable<T,U&&>::value &&
@@ -74,6 +90,13 @@ namespace rexy::cx{
 			for(;*l == *r && *l;++l, ++r);
 			return (static_cast<uchar>(*l)) - (static_cast<uchar>(*r));
 		}
+		constexpr void memcpy(void* l, const void* r, size_t n){
+			char* ld = static_cast<char*>(l);
+			const char* rd = static_cast<const char*>(r);
+			for(size_t i = 0;i < n;++i){
+				ld[i] = rd[i];
+			}
+		}
 	}
 
 }