A collection of containers that I use
C++ Python C Shell Batchfile
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Containers

A collection of containers that I use

Disclaimer

This software is supplied "AS IS" without any warranties and support

License

The MIT license

jc::HashTable

A fast and small C++ implementation of a hash table

  • ~260 lines of code
  • Open addressing
  • Robin Hood collision resolving
  • Backward shift deletion
  • On par with Google's dense_hash_map

Benchmarks

Benchmarks Hashtable

Performance examples for jc::HashTable. See benchmark page for more stats. Timings insert_random size=8 Timings insert_random size=152

Timings get_random size=8 Timings get_random size=152

Memory get_random size=8 Memory get_random size=152

Usage

jc::HashTable

struct SPod
{
    int     i;
    float   f;
};
typedef jc::HashTable<uint32_t, SPod> hashtable_t;

uint32_t numelements    = 1000; // The maximum number of entries to store
uint32_t load_factor    = 85; // percent
uint32_t tablesize      = uint32_t(numelements / (load_factor/100.0f)); 
uint32_t sizeneeded     = hashtable_t::CalcSize(tablesize);

void* mem = malloc(sizeneeded);

hashtable_t ht;
ht.Create(numelements, mem);

SPod value = { 1, 2.0f };
ht.Put(17, value);

Spod* pval = ht.Get(17);
assert( pval->i == 1 );
assert( pval->f == 2.0f );

hashtable_t it = ht.Begin();
hashtable_t itend = ht.End();
for(; it != itend; ++it)
{
    printf("key: %u  value: %d, %f\n", *it.GetKey(), it.GetValue()->i, it.GetValue()->f);
}

ht.Erase(17);

free(mem);