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c++ Programming Glossary: hash_combineC++ unordered_map using a custom class type as the key http://stackoverflow.com/questions/17016175/c-unordered-map-using-a-custom-class-type-as-the-key For a slightly better start you may use the hash_value and hash_combine function template from the Boost library. The former acts in.. const Key k const using boost hash_value using boost hash_combine Start with a hash value of 0 . std size_t seed 0 Modify 'seed'.. and bit shifting in one member of 'Key' after the other hash_combine seed hash_value k.first hash_combine seed hash_value k.second..
How to properly hash the custom struct? http://stackoverflow.com/questions/19195183/how-to-properly-hash-the-custom-struct c hash probability share improve this question boost hash_combine is really good one to hash different fields. If you don't have.. library you can use this template class T inline void hash_combine std size_t s const T v std hash T h s^ h v 0x9e3779b9 s 6 s.. S std size_t operator S const s const std size_t res 0 hash_combine res s.field1 hash_combine res s.field2 hash_combine res s.field3..
Magic number in boost::hash_combine http://stackoverflow.com/questions/4948780/magic-number-in-boosthash-combine number in boost hash_combine The boost hash_combine template function takes a reference.. number in boost hash_combine The boost hash_combine template function takes a reference to a hash called seed and..
Generic Hash function for all STL-containers http://stackoverflow.com/questions/6899392/generic-hash-function-for-all-stl-containers to a good answer by mimicking Boost First off we need the hash_combine function. For reasons beyond my understanding it's not been.. for everything else template class T inline void hash_combine std size_t seed const T v std hash T hasher seed ^ hasher v.. typename C const_iterator it c.begin end c.end it end it hash_combine value_type seed it return seed Usage std unordered_map std set..
unordered_map hash function c++ http://stackoverflow.com/questions/7222143/unordered-map-hash-function-c omission in C 11 Boost has the answer in terms of hash_combine . Feel free to just paste it from them Here's how I hash pairs.. them Here's how I hash pairs template class T inline void hash_combine std size_t seed const T v std hash T hasher seed ^ hasher v.. size_t operator const pair S T v const size_t seed 0 hash_combine seed v.first hash_combine seed v.second return seed You can..
Relevant boost features vs C++11 http://stackoverflow.com/questions/8851670/relevant-boost-features-vs-c11 some more extensions e.g. Boost.Functional Hash contains hash_combine and related functions not found in C 11 Boost.Chrono has I O..
How to write qHash for a QSet<SomeClass*> container? http://stackoverflow.com/questions/9126470/how-to-write-qhash-for-a-qsetsomeclass-container is to combine the hashes of all elements. Boost provides hash_combine and hash_range for this purpose. This should give you an idea..
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