Merge pull request #37 from OpenVicProject/add/dryad

Move to dryad library

1 files changed, 23 insertions, 0 deletions

diff --git a/include/openvic-dataloader/detail/utility/PointerHash.hpp b/include/openvic-dataloader/detail/utility/PointerHash.hpp
new file mode 100644
index 0000000..c0d28bc
--- /dev/null
+++ b/include/openvic-dataloader/detail/utility/PointerHash.hpp
@@ -0,0 +1,23 @@
+#pragma once
+
+#include <cstdint>
+
+namespace ovdl::detail {
+	/* hash any pointer */
+	template<typename T>
+	struct PointerHash {
+		using type = T;
+		using ptr_type = T*;
+		using const_type = const T;
+		using const_ptr_type = const T*;
+		using const_ptr_const_type = const const_ptr_type;
+		constexpr std::size_t operator()(const_ptr_const_type pointer) const {
+			auto addr = reinterpret_cast<uintptr_t>(pointer);
+#if SIZE_MAX < UINTPTR_MAX
+			/* size_t is not large enough to hold the pointer’s memory address */
+			addr %= SIZE_MAX; /* truncate the address so it is small enough to fit in a size_t */
+#endif
+			return addr;
+		}
+	};
+}
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