X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pod%2Fperlfunc.pod;h=dbefd85ee438c7de358949b019c896efab880b38;hb=2decb4fb82e001e3c9671c57b61232c651a9c22c;hp=90c1988fb0e14a0f498675540eaa8e04573ae2e3;hpb=8ea97a1e700347a7b6ed9267c8c34f286f94d5d6;p=p5sagit%2Fp5-mst-13.2.git diff --git a/pod/perlfunc.pod b/pod/perlfunc.pod index 90c1988..dbefd85 100644 --- a/pod/perlfunc.pod +++ b/pod/perlfunc.pod @@ -953,7 +953,7 @@ And so do these: delete @HASH{keys %HASH}; - delete @ARRAY{0 .. $#ARRAY}; + delete @ARRAY[0 .. $#ARRAY]; But both of these are slower than just assigning the empty list or undefining %HASH or @ARRAY: @@ -1422,8 +1422,16 @@ element is not autovivified if it doesn't exist. A hash or array element can be true only if it's defined, and defined if it exists, but the reverse doesn't necessarily hold true. +Given an expression that specifies the name of a subroutine, +returns true if the specified subroutine has ever been declared, even +if it is undefined. Mentioning a subroutine name for exists or defined +does not count as declaring it. + + print "Exists\n" if exists &subroutine; + print "Defined\n" if defined &subroutine; + Note that the EXPR can be arbitrarily complicated as long as the final -operation is a hash or array key lookup: +operation is a hash or array key lookup or subroutine name: if (exists $ref->{A}->{B}->{$key}) { } if (exists $hash{A}{B}{$key}) { } @@ -1431,6 +1439,8 @@ operation is a hash or array key lookup: if (exists $ref->{A}->{B}->[$ix]) { } if (exists $hash{A}{B}[$ix]) { } + if (exists &{$ref->{A}{B}{$key}}) { } + Although the deepest nested array or hash will not spring into existence just because its existence was tested, any intervening ones will. Thus C<$ref-E{"A"}> and C<$ref-E{"A"}-E{"B"}> will spring @@ -1448,6 +1458,12 @@ release. See L for specifics on how exists() acts when used on a pseudo-hash. +Use of a subroutine call, rather than a subroutine name, as an argument +to exists() is an error. + + exists ⊂ # OK + exists &sub(); # Error + =item exit EXPR Evaluates EXPR and exits immediately with that value. Example: @@ -2788,6 +2804,34 @@ declared global variable without qualifying it with a package name. (But only within the lexical scope of the C declaration. In this it differs from "use vars", which is package scoped.) +An C declaration declares a global variable that will be visible +across its entire lexical scope, even across package boundaries. The +package in which the variable is entered is determined at the point +of the declaration, not at the point of use. This means the following +behavior holds: + + package Foo; + our $bar; # declares $Foo::bar for rest of lexical scope + $bar = 20; + + package Bar; + print $bar; # prints 20 + +Multiple C declarations in the same lexical scope are allowed +if they are in different packages. If they happened to be in the same +package, Perl will emit warnings if you have asked for them. + + use warnings; + package Foo; + our $bar; # declares $Foo::bar for rest of lexical scope + $bar = 20; + + package Bar; + our $bar = 30; # declares $Bar::bar for rest of lexical scope + print $bar; # prints 30 + + our $bar; # emits warning + =item pack TEMPLATE,LIST Takes a LIST of values and converts it into a string using the rules