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| author | Kevin Matulef <matulef@gmail.com> | 2012-10-14 23:51:00 -0400 |
|---|---|---|
| committer | Kevin Matulef <matulef@gmail.com> | 2012-10-14 23:51:00 -0400 |
| commit | 02e0dc4015276b787dcfc448304d978a06bec51d (patch) | |
| tree | 4319f426a7426a7de93502d252f314230c7f63df /src/mongo/db/hasher.h | |
| parent | 77bf5afd2483098c11b0286d7882d15b9351fbee (diff) | |
| download | mongo-02e0dc4015276b787dcfc448304d978a06bec51d.tar.gz | |
SERVER-2001 define const to use as default hash seed
Diffstat (limited to 'src/mongo/db/hasher.h')
| -rw-r--r-- | src/mongo/db/hasher.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/mongo/db/hasher.h b/src/mongo/db/hasher.h index f252b058faa..ae3e9567cee 100644 --- a/src/mongo/db/hasher.h +++ b/src/mongo/db/hasher.h @@ -64,6 +64,13 @@ namespace mongo { class BSONElementHasher : private boost::noncopyable { public: + + /* The hash function we use can be given a seed, to effectively randomize it + * by choosing from among a family of hash functions. When it is not specified, + * use this. + */ + static const int DEFAULT_HASH_SEED = 0; + /* This computes a 64-bit hash of the value part of BSONElement "e", * preceded by the seed "seed". Squashes element (and any sub-elements) * of the same canonical type, so hash({a:{b:4}}) will be the same |