X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=folly%2FFingerprint.h;h=9cf0f5073c1bf35686c4abd0eb77e9d86872172f;hb=bdd9360c598d80d524de6780cd5be65af56d98fd;hp=a0c474564ab20708ee48b2a97f8bc3471b848f4b;hpb=22afce906d7e98d95f8c45c3301072d9fd891d41;p=folly.git

diff --git a/folly/Fingerprint.h b/folly/Fingerprint.h
index a0c47456..9cf0f507 100644
--- a/folly/Fingerprint.h
+++ b/folly/Fingerprint.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2012-present Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,22 +42,46 @@
  * @author Tudor Bosman (tudorb@facebook.com)
  */
 
-#ifndef FOLLY_FINGERPRINT_H_
-#define FOLLY_FINGERPRINT_H_
+#pragma once
 
 #include <cstdint>
 
-#include "folly/Range.h"
+#include <folly/Range.h>
 
 namespace folly {
 
 namespace detail {
+
 template <int BITS>
 struct FingerprintTable {
-  static const uint64_t poly[1 + (BITS-1)/64];
-  static const uint64_t table[8][256][1 + (BITS-1)/64];
+  static const uint64_t poly[1 + (BITS - 1) / 64];
+  static const uint64_t table[8][256][1 + (BITS - 1) / 64];
 };
-}  // namespace detail
+
+template <int BITS>
+const uint64_t FingerprintTable<BITS>::poly[1 + (BITS - 1) / 64] = {};
+template <int BITS>
+const uint64_t FingerprintTable<BITS>::table[8][256][1 + (BITS - 1) / 64] = {};
+
+#ifndef _MSC_VER
+// MSVC 2015 can't handle these extern specialization declarations,
+// but they aren't needed for things to work right, so we just don't
+// declare them in the header for MSVC.
+
+#define FOLLY_DECLARE_FINGERPRINT_TABLES(BITS)                      \
+  template <>                                                       \
+  const uint64_t FingerprintTable<BITS>::poly[1 + (BITS - 1) / 64]; \
+  template <>                                                       \
+  const uint64_t FingerprintTable<BITS>::table[8][256][1 + (BITS - 1) / 64]
+
+FOLLY_DECLARE_FINGERPRINT_TABLES(64);
+FOLLY_DECLARE_FINGERPRINT_TABLES(96);
+FOLLY_DECLARE_FINGERPRINT_TABLES(128);
+
+#undef FOLLY_DECLARE_FINGERPRINT_TABLES
+#endif
+
+} // namespace detail
 
 /**
  * Compute the Rabin fingerprint.
@@ -74,9 +98,10 @@ class Fingerprint {
  public:
   Fingerprint() {
     // Use a non-zero starting value. We'll use (1 << (BITS-1))
-    fp_[0] = 1UL << 63;
-    for (int i = 1; i < size(); i++)
+    fp_[0] = 1ULL << 63;
+    for (int i = 1; i < size(); i++) {
       fp_[i] = 0;
+    }
   }
 
   Fingerprint& update8(uint8_t v) {
@@ -260,7 +285,4 @@ inline uint64_t Fingerprint<128>::shlor64(uint64_t v) {
   return out;
 }
 
-}  // namespace folly
-
-#endif /* FOLLY_FINGERPRINT_H_ */
-
+} // namespace folly