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.\"
.IX Title "Aspect::Advice::Around 3pm"
.TH Aspect::Advice::Around 3pm "2021-01-07" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Aspect::Advice::Around \- Execute code both before and after a function
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Aspect;
\&  
\&  around {
\&      # Trace all calls to your module
\&      print STDERR "Called my function " . $_\->sub_name . "\en";
\&  
\&      # Lexically alter a global for this function
\&      local $MyModule::MAXSIZE = 1000;
\&  
\&      # Continue and execute the function
\&      $_\->run_original;
\&  
\&      # Suppress exceptions for the call
\&      $_\->return_value(1) if $_\->exception;
\&  
\&  } call qr/^ MyModule::\ew+ $/;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \f(CW\*(C`around\*(C'\fR advice type is used to execute code on either side of a
function, allowing deep and precise control of how the function will be
called when none of the other advice types are good enough.
.PP
Using \f(CW\*(C`around\*(C'\fR advice is also critical if you want to lexically alter
the environment in which the call will be made (as in the example above
where a global variable is temporarily changed).
.PP
This advice type is also the most computationally expensive to run, so if
your problem can be solved with the use of a different advice type,
particularly \f(CW\*(C`before\*(C'\fR, you should use that instead.
.PP
Please note that unlike the other advice types, your code in \f(CW\*(C`around\*(C'\fR is
required to trigger the execution of the target function yourself with the
\&\f(CW\*(C`proceed\*(C'\fR method. If you do not \f(CW\*(C`proceed\*(C'\fR and also do not set either a
\&\f(CW\*(C`return_value\*(C'\fR or \f(CW\*(C`exception\*(C'\fR, the function call will return \f(CW\*(C`undef\*(C'\fR
in scalar context or the null list \f(CW\*(C`()\*(C'\fR in list context.
.SH "AUTHORS"
.IX Header "AUTHORS"
Adam Kennedy <adamk@cpan.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright 2010 \- 2013 Adam Kennedy.
.PP
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.