Returned some code

src/crypto/generic-ops.h

@@ -0,0 +1,36 @@
+// Copyright (c) 2012-2013 The Cryptonote developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#pragma once
+
+#include <cstddef>
+#include <cstring>
+#include <functional>
+
+#define CRYPTO_MAKE_COMPARABLE(type) \
+namespace crypto { \
+  inline bool operator==(const type &_v1, const type &_v2) { \
+    return std::memcmp(&_v1, &_v2, sizeof(type)) == 0; \
+  } \
+  inline bool operator!=(const type &_v1, const type &_v2) { \
+    return std::memcmp(&_v1, &_v2, sizeof(type)) != 0; \
+  } \
+}
+
+#define CRYPTO_MAKE_HASHABLE(type) \
+CRYPTO_MAKE_COMPARABLE(type) \
+namespace crypto { \
+  static_assert(sizeof(std::size_t) <= sizeof(type), "Size of " #type " must be at least that of size_t"); \
+  inline std::size_t hash_value(const type &_v) { \
+    return reinterpret_cast<const std::size_t &>(_v); \
+  } \
+} \
+namespace std { \
+  template<> \
+  struct hash<crypto::type> { \
+    std::size_t operator()(const crypto::type &_v) const { \
+      return reinterpret_cast<const std::size_t &>(_v); \
+    } \
+  }; \
+}