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* Copyright by the contributors to the Dafny Project
* SPDX-License-Identifier: MIT
*******************************************************************************/
// RUN: %verify "%s"
/**
* Specifications that should be satisfied by any implementation of mutable maps.
* Possible instantiations are given in "MutableMapDafny.dfy" (not meant for usage,
* only exists to verify feasability) and "../../src/MutableMap/MutableMap.dfy"
* (meant for usage; interfaces with external code, e.g. "../../src/MutableMap/
* MutableMap.java").
*/
module {:options "-functionSyntax:4"} MutableMapTrait {
trait {:termination false} MutableMapTrait<K(==),V(==)> {
function content(): map<K, V>
reads this
method Put(k: K, v: V)
modifies this
ensures this.content() == old(this.content())[k := v]
ensures k in old(this.content()).Keys ==> this.content().Values + {old(this.content())[k]} == old(this.content()).Values + {v}
ensures k !in old(this.content()).Keys ==> this.content().Values == old(this.content()).Values + {v}
function Keys(): (keys: set<K>)
reads this
ensures keys == this.content().Keys
predicate HasKey(k: K)
reads this
ensures HasKey(k) <==> k in this.content().Keys
function Values(): (values: set<V>)
reads this
ensures values == this.content().Values
function Items(): (items: set<(K,V)>)
reads this
ensures items == this.content().Items
ensures items == set k | k in this.content().Keys :: (k, this.content()[k])
function Select(k: K): (v: V)
reads this
requires this.HasKey(k)
ensures v in this.content().Values
ensures this.content()[k] == v
method Remove(k: K)
modifies this
ensures this.content() == old(this.content()) - {k}
ensures k in old(this.content()).Keys ==> this.content().Values + {old(this.content())[k]} == old(this.content()).Values
function Size(): (size: int)
reads this
ensures size == |this.content().Items|
}
} |