method

hash

v2_1_10 - Show latest stable - 0 notes - Class: Object

hash() protected

Generates a Fixnum hash value for this object. This function must have the property that a.eql?(b) implies a.hash == b.hash.

The hash value is used along with #eql? by the Hash class to determine if two objects reference the same hash key. Any hash value that exceeds the capacity of a Fixnum will be truncated before being used.

The hash value for an object may not be identical across invocations or implementations of Ruby. If you need a stable identifier across Ruby invocations and implementations you will need to generate one with a custom method.

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VALUE
rb_obj_hash(VALUE obj)
{
    long rb_objid_hash(st_index_t index);
    VALUE oid = rb_obj_id(obj);
#if SIZEOF_LONG == SIZEOF_VOIDP
    st_index_t index = NUM2LONG(oid);
#elif SIZEOF_LONG_LONG == SIZEOF_VOIDP
    st_index_t index = NUM2LL(oid);
#else
# error not supported
#endif
    return LONG2FIX(rb_objid_hash(index));
}

hash

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