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Devel::SelfStubber.3
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.\" -*- mode: troff; coding: utf-8 -*- .\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>. .ie n \{\ . ds C` "" . ds C' "" 'br\} .el\{\ . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" ======================================================================== .\" .IX Title "Devel::SelfStubber 3" .TH Devel::SelfStubber 3 2019-02-18 "perl v5.38.0" "Perl Programmers Reference Guide" .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH NAME Devel::SelfStubber \- generate stubs for a SelfLoading module .SH SYNOPSIS .IX Header "SYNOPSIS" To generate just the stubs: .PP .Vb 2 \& use Devel::SelfStubber; \& Devel::SelfStubber\->stub(\*(AqMODULENAME\*(Aq,\*(AqMY_LIB_DIR\*(Aq); .Ve .PP or to generate the whole module with stubs inserted correctly .PP .Vb 3 \& use Devel::SelfStubber; \& $Devel::SelfStubber::JUST_STUBS=0; \& Devel::SelfStubber\->stub(\*(AqMODULENAME\*(Aq,\*(AqMY_LIB_DIR\*(Aq); .Ve .PP MODULENAME is the Perl module name, e.g. Devel::SelfStubber, NOT 'Devel/SelfStubber' or 'Devel/SelfStubber.pm'. .PP MY_LIB_DIR defaults to '.' if not present. .SH DESCRIPTION .IX Header "DESCRIPTION" Devel::SelfStubber prints the stubs you need to put in the module before the _\|_DATA_\|_ token (or you can get it to print the entire module with stubs correctly placed). The stubs ensure that if a method is called, it will get loaded. They are needed specifically for inherited autoloaded methods. .PP This is best explained using the following example: .PP Assume four classes, A,B,C & D. .PP A is the root class, B is a subclass of A, C is a subclass of B, and D is another subclass of A. .PP .Vb 5 \& A \& / \e \& B D \& / \& C .Ve .PP If D calls an autoloaded method 'foo' which is defined in class A, then the method is loaded into class A, then executed. If C then calls method 'foo', and that method was reimplemented in class B, but set to be autoloaded, then the lookup mechanism never gets to the AUTOLOAD mechanism in B because it first finds the method already loaded in A, and so erroneously uses that. If the method foo had been stubbed in B, then the lookup mechanism would have found the stub, and correctly loaded and used the sub from B. .PP So, for classes and subclasses to have inheritance correctly work with autoloading, you need to ensure stubs are loaded. .PP The SelfLoader can load stubs automatically at module initialization with the statement 'SelfLoader\->\fBload_stubs()\fR';, but you may wish to avoid having the stub loading overhead associated with your initialization (though note that the SelfLoader::load_stubs method will be called sooner or later \- at latest when the first sub is being autoloaded). In this case, you can put the sub stubs before the _\|_DATA_\|_ token. This can be done manually, but this module allows automatic generation of the stubs. .PP By default it just prints the stubs, but you can set the global \f(CW$Devel::SelfStubber::JUST_STUBS\fR to 0 and it will print out the entire module with the stubs positioned correctly. .PP At the very least, this is useful to see what the SelfLoader thinks are stubs \- in order to ensure future versions of the SelfStubber remain in step with the SelfLoader, the SelfStubber actually uses the SelfLoader to determine which stubs are needed.