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use v6;
use Test;
plan 37;
#L<S03/Autoincrement precedence>
=begin description
Verify that autoincrement/autodecrement work properly.
(Overflow cases are handled in S03-operators/overflow.t)
=end description
{
my $a = Mu;
is($a++, 0, 'Mu++ == 0');
#?niecza todo '#88'
$a = Mu;
is $a--, 0 , 'postincrement (& decrement) returns 0 the first time';
$a = 'z';
is($a++, 'z', 'magical ++ should not be numified');
isa-ok($a, "Str", "it isa Str");
is $a, 'aa', 'magical ++ is carrying properly';
}
my %a = ('a' => 1);
%a{"a"}++;
is(%a{'a'}, 2, "hash key");
my %b = ('b' => 1);
my $var = 'b';
%b{$var}++;
is(%b{$var}, 2, "hash key via var");
my @a = (1);
@a[0]++;
is(@a[0], 2, "array elem");
my @b = (1);
my $moo = 0;
@b[$moo]++;
is(@b[$moo], 2, "array elem via var");
is($moo, 0, "var was not touched");
# Test that the expression to increment will only be evaluated once.
{
my $was_in_foo;
my sub foo () { $was_in_foo++; 0 };
my @array = (42);
is(++@array[+foo()], 43, "++ evaluates the expression to increment only once (1)");
is($was_in_foo, 1, "++ evaluates the expression to increment only once (2)");
}
# Test case courtesy of Limbic_Region
{
my $curr = 4;
my @array = 1..5;
is @array[$curr], 5, "postincrements in array subscripts work";
@array[ --$curr ]++;
is $curr, 3, "postincrements in array subscripts work";
is @array[$curr], 5, "postincrements in array subscripts work";
}
# test incrementing literals
# all of those can be detected at compile time, so use eval-dies-ok here
{
eval-dies-ok ' 4++ ', "can't postincrement a literal number";
eval-dies-ok ' ++4 ', "can't preincrement a literal number";
eval-dies-ok ' 4-- ', "can't postdecrement a literal number";
eval-dies-ok ' --4 ', "can't predecrement a literal number";
eval-dies-ok ' "x"++ ', "can't postincrement a literal string";
eval-dies-ok ' ++"x" ', "can't preincrement a literal string";
eval-dies-ok ' "x"-- ', "can't postdecrement a literal string";
eval-dies-ok ' --"x" ', "can't predecrement a literal string";
}
# this used to be a rakudo regression
{
my $x = 2.0;
$x += 1;
ok $x == 3.0, 'can add Int to Rat with +=';
my Rat $y = 2.0;
$y += 1;
ok $y == 3.0, 'can add Int to Rat with += and type constraint';
}
{
my $x = 2.0.Num;
$x += 1;
ok $x == 3.0, 'can add Int to Num with +=';
my Num $y = 2.0.Num;
$y += 1;
ok $y == 3.0, 'can add Int to Num with += and type constraint';
}
# also a Rakudo regression
{
my $x = Bool::False;
is ++$x, Bool::True, '++ on False works';
$x = Bool::False;
is $x.succ, Bool::True, '.succ on False works';
$x = Bool::True;
is --$x, Bool::False, '-- on True works';
$x = Bool::True;
is $x.pred, Bool::False, '.succ on False works';
}
# RT #74912
#?niecza todo 'Works fine in niecza...'
eval-dies-ok 'my $x = 0; ++++$x',
'can not double-increment, because the return value is not a container';
{
is state $i++, 0, '++ is allowed on declarator';
is $i, 1, '...and actually increments variable';
is my $j.++, 0, '.++ is allowed on declarator';
is $j, 1, '...and actually increments variable';
is my $k.defined, False, 'method is allowed on declarator';
}
# vim: ft=perl6
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