Fix ptrdiff_t undefined error

cyb70289 · serge-sans-paille · commit dd9590e3e12d · 2021-09-29T05:01:20.000Z
diff --git a/include/xsimd/memory/xsimd_aligned_allocator.hpp b/include/xsimd/memory/xsimd_aligned_allocator.hpp
@@ -14,6 +14,7 @@
 #include "../config/xsimd_arch.hpp"
 
 #include <algorithm>
+#include <cstddef>
 #include <utility>
 #ifdef _WIN32
 #include <malloc.h>
