array-hash
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#include <array_growth_policy.h>
Public Member Functions | |
power_of_two_growth_policy (std::size_t &min_bucket_count_in_out) | |
std::size_t | bucket_for_hash (std::size_t hash) const noexcept |
std::size_t | next_bucket_count () const |
std::size_t | max_bucket_count () const |
void | clear () noexcept |
Protected Attributes | |
std::size_t | m_mask |
Grow the hash table by a factor of GrowthFactor keeping the bucket count to a power of two. It allows the table to use a mask operation instead of a modulo operation to map a hash to a bucket.
GrowthFactor must be a power of two >= 2.
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inlineexplicit |
Called on the hash table creation and on rehash. The number of buckets for the table is passed in parameter. This number is a minimum, the policy may update this value with a higher value if needed (but not lower).
If 0 is given, min_bucket_count_in_out must still be 0 after the policy creation and bucket_for_hash must always return 0 in this case.
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inlinenoexcept |
Return the bucket [0, bucket_count()) to which the hash belongs. If bucket_count() is 0, it must always return 0.
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inlinenoexcept |
Reset the growth policy as if it was created with a bucket count of 0. After a clear, the policy must always return 0 when bucket_for_hash is called.
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inline |
Return the maximum number of buckets supported by the policy.
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inline |
Return the number of buckets that should be used on next growth.
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protected |