diff options
Diffstat (limited to 'MDK/Common/Func.pm')
| -rw-r--r-- | MDK/Common/Func.pm | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/MDK/Common/Func.pm b/MDK/Common/Func.pm index 55277c9..1b30a7e 100644 --- a/MDK/Common/Func.pm +++ b/MDK/Common/Func.pm @@ -5,10 +5,26 @@ use MDK::Common::Math; use vars qw(@ISA %EXPORT_TAGS @EXPORT_OK); @ISA = qw(Exporter); -@EXPORT_OK = qw(fold_left mapn mapn_ map_index grep_index find_index map_each grep_each before_leaving catch_cdie cdie); +@EXPORT_OK = qw(may_apply if_ if__ fold_left mapn mapn_ map_index grep_index find_index map_each grep_each before_leaving catch_cdie cdie); %EXPORT_TAGS = (all => [ @EXPORT_OK ]); +sub may_apply { $_[0] ? $_[0]->($_[1]) : (@_ > 2 ? $_[2] : $_[1]) } + +# prototype is needed for things like: if_(/foo/, bar => 'boo') +sub if_($@) { + my $b = shift; + $b or return (); + wantarray || @_ <= 1 or die("if_ called in scalar context with more than one argument " . join(":", caller())); + wantarray ? @_ : $_[0]; +} +sub if__($@) { + my $b = shift; + defined $b or return (); + wantarray || @_ <= 1 or die("if_ called in scalar context with more than one argument " . join(":", caller())); + wantarray ? @_ : $_[0]; +} + sub fold_left(&@) { my ($f, $initial, @l) = @_; local ($::a, $::b); |