smash::pair_hash Struct Reference

#include <parametrizations.h>

Hash a pair of integers.

Note that symmetric pairs and permutations yield identical hashes with this implementation.

Definition at line 436 of file parametrizations.h.

Public Member Functions
std::size_t	operator() (const std::pair< uint64_t, uint64_t > &p) const
	Hashing is done by this operator. More...

Member Function Documentation

std::size_t smash::pair_hash::operator() ( const std::pair< uint64_t, uint64_t > &  p ) const

inline

Hashing is done by this operator.

Definition at line 438 of file parametrizations.h.

                                                                   {
    auto h1 = std::hash<uint64_t>{}(p.first);
    auto h2 = std::hash<uint64_t>{}(p.second);

    /* In our case the integers are PDG codes. We know they are different
     * and their order is defined, so we can simply combine the hashes
     * using XOR. Note that this yields 0 for h1 == h2. Also,
     * std::swap(h1, h2) does not not change the final hash. */
    assert(h1 != h2);
    return h1 ^ h2;
  }

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The documentation for this struct was generated from the following file:

• src/include/smash/parametrizations.h