Fix msvc compiler error C4146 (minus operator applied to unsigned type)

kobake · kobake · commit 292112f87ef1 · 2017-03-07T02:42:44.000+09:00
On msvc14, the compiler error C4146 (unary minus operator applied to unsigned type, result still unsigned) had been occured.
Use '0 - x' styled formula instead of '-x' so as to fix the error.
diff --git a/src/bloom.cpp b/src/bloom.cpp
@@ -254,8 +254,8 @@ void CRollingBloomFilter::insert(const std::vector<unsigned char>& vKey)
         if (nGeneration == 4) {
             nGeneration = 1;
         }
-        uint64_t nGenerationMask1 = -(uint64_t)(nGeneration & 1);
-        uint64_t nGenerationMask2 = -(uint64_t)(nGeneration >> 1);
+        uint64_t nGenerationMask1 = 0 - (uint64_t)(nGeneration & 1);
+        uint64_t nGenerationMask2 = 0 - (uint64_t)(nGeneration >> 1);
         /* Wipe old entries that used this generation number. */
         for (uint32_t p = 0; p < data.size(); p += 2) {
             uint64_t p1 = data[p], p2 = data[p + 1];
