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→{{header|Perl 6}}: Add a Perl 6 example
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$x->delete;</lang>
=={{header|Perl 6}}==
{{works with|Rakudo|2018.12}}
There is some jitter in the timer, but it is typically accurate to within a few thousandths of a second.
<lang perl6>class Integrator {
has $.f is rw = sub ($t) { 0 };
has $.now is rw;
has $.value is rw = 0;
has $.integrator is rw;
method init() {
self.value = &(self.f)(0);
self.integrator = Thread.new(
:code({
loop {
my $t1 = now;
self.value += (&(self.f)(self.now) + &(self.f)($t1)) * ($t1 - self.now) / 2;
self.now = $t1;
sleep .001;
}
}),
:app_lifetime(True)
).run
}
method Input (&f-of-t) {
self.init;
self.f = &f-of-t;
self.now = now;
}
method Output { self.value }
}
my $a = Integrator.new;
$a.Input( sub ($t) {sin(pi * $t) } );
say "Initial value: ", $a.Output;
sleep 2;
say "After 2 seconds: ", $a.Output;
$a.Input( sub ($t) { 0 } );
sleep .5;
say "f(0): ", $a.Output;</lang>
{{out|Typical output}}
<pre>Initial value: 0
After 2 seconds: -0.0005555887464620366
f(0): 0</pre>
=={{header|OxygenBasic}}==
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