Initial data commit

Task/Priority-queue/Mercury/priority-queue.mercury

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+:- module test_pqueue.
+
+:- interface.
+
+:- import_module io.
+
+:- pred main(io::di, io::uo) is det.
+
+:- implementation.
+
+:- import_module int.
+:- import_module list.
+:- import_module pqueue.
+:- import_module string.
+
+:- pred build_pqueue(pqueue(int,string)::in, pqueue(int,string)::out) is det.
+build_pqueue(!PQ) :-
+  pqueue.insert(3, "Clear drains",   !PQ),
+  pqueue.insert(4, "Feed cat",       !PQ),
+  pqueue.insert(5, "Make tea",       !PQ),
+  pqueue.insert(1, "Solve RC tasks", !PQ),
+  pqueue.insert(2, "Tax return",     !PQ).
+
+:- pred display_pqueue(pqueue(int, string)::in, io::di, io::uo) is det.
+display_pqueue(PQ, !IO) :-
+  ( pqueue.remove(K, V, PQ, PQO) ->
+      io.format("Key = %d, Value = %s\n", [i(K), s(V)], !IO),
+      display_pqueue(PQO, !IO)
+  ;
+      true
+  ).
+
+main(!IO) :-
+  build_pqueue(pqueue.init, PQO),
+  display_pqueue(PQO, !IO).