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## Function template hash_combine

boost::hash_combine — Called repeatedly to incrementally create a hash value from several variables.

## Synopsis

    template<typename T> void hash_combine(size_t & seed, T const& v);

## Description

Effects: |
    seed ^= hash_value(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
Notes: | hash_value is called without qualification, so that overloads can be found via ADL. This is an extension to TR1
Throws: | Only throws if hash_value(T) throws. Strong exception safety, as long as hash_value(T) also has strong exception safety.