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Datei:
Priority_Queue_Specs.thy
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(* Author: Tobias Nipkow, Peter Lammich *)
section \<open>Priority Queue Specifications\<close>
theory Priority_Queue_Specs
imports "HOL-Library.Multiset"
begin
text \<open>Priority queue interface + specification:\<close>
locale Priority_Queue =
fixes empty :: "'q"
and is_empty :: "'q \ bool"
and insert :: "'a::linorder \ 'q \ 'q"
and get_min :: "'q \ 'a"
and del_min :: "'q \ 'q"
and invar :: "'q \ bool"
and mset :: "'q \ 'a multiset"
assumes mset_empty: "mset empty = {#}"
and is_empty: "invar q \ is_empty q = (mset q = {#})"
and mset_insert: "invar q \ mset (insert x q) = mset q + {#x#}"
and mset_del_min: "invar q \ mset q \ {#} \
mset (del_min q) = mset q - {# get_min q #}"
and mset_get_min: "invar q \ mset q \ {#} \ get_min q = Min_mset (mset q)"
and invar_empty: "invar empty"
and invar_insert: "invar q \ invar (insert x q)"
and invar_del_min: "invar q \ mset q \ {#} \ invar (del_min q)"
text \<open>Extend locale with \<open>merge\<close>. Need to enforce that \<open>'q\<close> is the same in both locales.\<close>
locale Priority_Queue_Merge = Priority_Queue where empty = empty for empty :: 'q +
fixes merge :: "'q \ 'q \ 'q"
assumes mset_merge: "\ invar q1; invar q2 \ \ mset (merge q1 q2) = mset q1 + mset q2"
and invar_merge: "\ invar q1; invar q2 \ \ invar (merge q1 q2)"
end
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