10-25-2000
If the function is autoloaded, then it will find the "cmd"
in the FPATH location "before" it finds it in the PATH
location (i.e. it executes autoloaded functions before
commands). If the function is not autoloaded, then it will
find the command first.
My original question deals with having the same directory
in BOTH PATH and FPATH and how the shell handles this,
especially concerning the "efficiency" of its search.
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LEARN ABOUT CENTOS
devel::selfstubber
Devel::SelfStubber(3pm) Perl Programmers Reference Guide Devel::SelfStubber(3pm)
NAME
Devel::SelfStubber - generate stubs for a SelfLoading module
SYNOPSIS
To generate just the stubs:
use Devel::SelfStubber;
Devel::SelfStubber->stub('MODULENAME','MY_LIB_DIR');
or to generate the whole module with stubs inserted correctly
use Devel::SelfStubber;
$Devel::SelfStubber::JUST_STUBS=0;
Devel::SelfStubber->stub('MODULENAME','MY_LIB_DIR');
MODULENAME is the Perl module name, e.g. Devel::SelfStubber, NOT 'Devel/SelfStubber' or 'Devel/SelfStubber.pm'.
MY_LIB_DIR defaults to '.' if not present.
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.
This is best explained using the following example:
Assume four classes, A,B,C & D.
A is the root class, B is a subclass of A, C is a subclass of B, and D is another subclass of A.
A
/
B D
/
C
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.
So, for classes and subclasses to have inheritance correctly work with autoloading, you need to ensure stubs are loaded.
The SelfLoader can load stubs automatically at module initialization with the statement 'SelfLoader->load_stubs()';, 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.
By default it just prints the stubs, but you can set the global $Devel::SelfStubber::JUST_STUBS to 0 and it will print out the entire
module with the stubs positioned correctly.
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.
perl v5.16.3 2013-03-04 Devel::SelfStubber(3pm)