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26 lines
1.1 KiB
Go
26 lines
1.1 KiB
Go
package set
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// Rules represents the operations that define membership for a Set.
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//
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// Each Set has a Rules instance, whose methods must satisfy the interface
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// contracts given below for any value that will be added to the set.
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type Rules interface {
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// Hash returns an int that somewhat-uniquely identifies the given value.
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//
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// A good hash function will minimize collisions for values that will be
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// added to the set, though collisions *are* permitted. Collisions will
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// simply reduce the efficiency of operations on the set.
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Hash(interface{}) int
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// Equivalent returns true if and only if the two values are considered
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// equivalent for the sake of set membership. Two values that are
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// equivalent cannot exist in the set at the same time, and if two
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// equivalent values are added it is undefined which one will be
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// returned when enumerating all of the set members.
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//
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// Two values that are equivalent *must* result in the same hash value,
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// though it is *not* required that two values with the same hash value
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// be equivalent.
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Equivalent(interface{}, interface{}) bool
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}
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