theory Timing

imports "../Base"

begin

text {*

 {\bf Problem:}

  You want to measure the running time of a tactic or function.\smallskip

  {\bf Solution:} Time can be measured using the function 

  @{ML start_timing} and @{ML end_timing}.\smallskip

*}

ML {* timeap *}

fun 

 ackermann:: "(nat * nat) \<Rightarrow> nat"

where

    "ackermann (0, n) = n + 1"

  | "ackermann (m, 0) = ackermann (m - 1, 1)"

  | "ackermann (m, n) = ackermann (m - 1, ackermann (m, n - 1))"

text {* Does not work yet! *}

lemma "ackermann (3, 4) = 125"

apply(tactic {* timeap  (asm_full_simp_tac (@{simpset} addsimps @{thms "nat_number"})) 1 *})

(*

apply(tactic {* 

  let 

    val start = start_timing ();

    val res = asm_full_simp_tac (@{simpset} addsimps @{thms "nat_number"}) 1;

  in

    (warning (#message  (end_timing start)); res)

  end *})*)

done

end