package EVENT_PACKAGE is
type EVENT is (increment,restart);
type INTARRAY is array (POSITIVE range <>) of INTEGER;
function ONLYONE(input:INTARRAY) return INTEGER;
subtype RESOLVEDINT is ONLYONE INTEGER;
end EVENT_PACKAGE;

package body EVENT_PACKAGE is
function ONLYONE(input:INTARRAY) return INTEGER is
begin
--  return input(input'low);
  return input(input'high);
end ONLYONE;
end EVENT_PACKAGE;

use work.EVENT_PACKAGE.all;
entity COUNTER is
  port(inputevent:EVENT);
end COUNTER;

architecture EVENTDRIVEN of COUNTER is
signal count:RESOLVEDINT register :=0;
begin
  COUNTER_BLOCK:block(inputevent=increment)
    begin
      count<= guarded count+1 after 5ns;
    end block;
  INTERRUPT_BLOCK:block(inputevent=restart)
    begin
      count<= guarded 0;
    end block;
end EVENTDRIVEN;

use work.EVENT_PACKAGE.all;
entity vED is
end vED;

architecture SIMPLE of vED is
signal ev:EVENT;
component COUNTER
  port(inputevent:EVENT);
end component;
for iC:COUNTER use entity work.COUNTER(EVENTDRIVEN);
begin
iC:COUNTER
  port map(ev);
vP:process
   begin
     ev<= increment, restart after 40 ns,
	  increment after 50ns, restart after 120ns;
   wait;
   end process;
end SIMPLE;


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