From fcf83dbf9effab3bd98bad2b83b2468b7eb05cfd Mon Sep 17 00:00:00 2001
From: Tim Foley <tfoley@nvidia.com>
Date: Fri, 9 Jun 2017 11:34:21 -0700
Subject: Initial import of code.

---
 source/core/hash.h | 105 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 source/core/hash.h

(limited to 'source/core/hash.h')

diff --git a/source/core/hash.h b/source/core/hash.h
new file mode 100644
index 000000000..07327a415
--- /dev/null
+++ b/source/core/hash.h
@@ -0,0 +1,105 @@
+#ifndef CORELIB_HASH_H
+#define CORELIB_HASH_H
+
+#include "slang-math.h"
+#include <string.h>
+
+namespace CoreLib
+{
+	namespace Basic
+	{
+
+		inline int GetHashCode(double key)
+		{
+			return FloatAsInt((float)key);
+		}
+		inline int GetHashCode(float key)
+		{
+			return FloatAsInt(key);
+		}
+		inline int GetHashCode(const char * buffer)
+		{
+			if (!buffer)
+				return 0;
+			int hash = 0;
+			int c;
+			auto str = buffer;
+			c = *str++;
+			while (c)
+			{
+				hash = c + (hash << 6) + (hash << 16) - hash;
+				c = *str++;
+			}
+			return hash;
+		}
+		inline int GetHashCode(char * buffer)
+		{
+			return GetHashCode(const_cast<const char *>(buffer));
+		}
+
+		template<int IsInt>
+		class Hash
+		{
+		public:
+		};
+		template<>
+		class Hash<1>
+		{
+		public:
+			template<typename TKey>
+			static int GetHashCode(TKey & key)
+			{
+				return (int)key;
+			}
+		};
+		template<>
+		class Hash<0>
+		{
+		public:
+			template<typename TKey>
+			static int GetHashCode(TKey & key)
+			{
+				return key.GetHashCode();
+			}
+		};
+		template<int IsPointer>
+		class PointerHash
+		{};
+		template<>
+		class PointerHash<1>
+		{
+		public:
+			template<typename TKey>
+			static int GetHashCode(TKey const& key)
+			{
+				return (int)((CoreLib::PtrInt)key) / 16; // sizeof(typename std::remove_pointer<TKey>::type);
+			}
+		};
+		template<>
+		class PointerHash<0>
+		{
+		public:
+			template<typename TKey>
+			static int GetHashCode(TKey & key)
+			{
+				return Hash<std::is_integral<TKey>::value || std::is_enum<TKey>::value>::GetHashCode(key);
+			}
+		};
+
+		template<typename TKey>
+		int GetHashCode(const TKey & key)
+		{
+			return PointerHash<std::is_pointer<TKey>::value>::GetHashCode(key);
+		}
+
+		template<typename TKey>
+		int GetHashCode(TKey & key)
+		{
+			return PointerHash<std::is_pointer<TKey>::value>::GetHashCode(key);
+		}
+
+		
+	}
+}
+
+#endif
\ No newline at end of file
-- 
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