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DRY up and annotate an anonymous constant

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This commit is contained in:
Vinnie Falco
2013-06-07 10:19:47 -07:00
parent b305e682ed
commit 5ae48ddad6
1 changed files with 9 additions and 2 deletions
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11
src/cpp/ripple/SHAMap.cpp
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@@ -24,13 +24,20 @@ DECLARE_INSTANCE(SHAMapTreeNode);
void SHAMapNode::setMHash() const
{
using namespace std;
// VFALCO: TODO, figure out what this is for and whether or
// not it affects the protocol specification.
//
const std::size_t mysteriousConstant = 0x9e3779b9;
std::size_t h = HashMaps::getInstance ().getNonce <std::size_t> ()
+ (mDepth * 0x9e3779b9);
+ (mDepth * mysteriousConstant);
const unsigned int *ptr = reinterpret_cast <const unsigned int *>(mNodeID.begin());
for (int i = (mDepth + 7) / 8; i != 0; --i)
h = (h * 0x9e3779b9) ^ *ptr++;
h = (h * mysteriousConstant) ^ *ptr++;
mHash = h;
}