bloom: use constexpr where appropriate

Author: fanquake

src/bloom.cpp

@@ -16,8 +16,8 @@
 
 #include <algorithm>
 
-#define LN2SQUARED 0.4804530139182014246671025263266649717305529515945455
-#define LN2 0.6931471805599453094172321214581765680755001343602552
+static constexpr double LN2SQUARED = 0.4804530139182014246671025263266649717305529515945455;
+static constexpr double LN2 = 0.6931471805599453094172321214581765680755001343602552;
 
 CBloomFilter::CBloomFilter(const unsigned int nElements, const double nFPRate, const unsigned int nTweakIn, unsigned char nFlagsIn) :
     /**

src/bloom.h

@@ -13,8 +13,8 @@ class COutPoint;
 class CTransaction;
 
 //! 20,000 items with fp rate < 0.1% or 10,000 items and <0.0001%
-static const unsigned int MAX_BLOOM_FILTER_SIZE = 36000; // bytes
-static const unsigned int MAX_HASH_FUNCS = 50;
+static constexpr unsigned int MAX_BLOOM_FILTER_SIZE = 36000; // bytes
+static constexpr unsigned int MAX_HASH_FUNCS = 50;
 
 /**
  * First two bits of nFlags control how much IsRelevantAndUpdate actually updates