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Restrict table bits_per_tag at compile time #35

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Restrict table bits_per_tag at compile time #35

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4 changes: 4 additions & 0 deletions src/packedtable.h
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,10 @@ namespace cuckoofilter {
// Using Permutation encoding to save 1 bit per tag
template <size_t bits_per_tag>
class PackedTable {
static_assert(bits_per_tag == 5 || bits_per_tag == 6 || bits_per_tag == 7 ||
bits_per_tag == 8 || bits_per_tag == 9 ||
bits_per_tag == 13 || bits_per_tag == 17,
"bits_per_tag must be 5, 6, 7, 8, 9, 13, or 17");
static const size_t kDirBitsPerTag = bits_per_tag - 4;
static const size_t kBitsPerBucket = (3 + kDirBitsPerTag) * 4;
static const size_t kBytesPerBucket = (kBitsPerBucket + 7) >> 3;
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4 changes: 4 additions & 0 deletions src/singletable.h
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,10 @@ namespace cuckoofilter {
// the most naive table implementation: one huge bit array
template <size_t bits_per_tag>
class SingleTable {
static_assert(bits_per_tag == 2 || bits_per_tag == 4 || bits_per_tag == 8 ||
bits_per_tag == 12 || bits_per_tag == 16 ||
bits_per_tag == 32,
"bits_per_tag must be 2, 4, 8, 12, 16, or 32");
static const size_t kTagsPerBucket = 4;
static const size_t kBytesPerBucket =
(bits_per_tag * kTagsPerBucket + 7) >> 3;
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