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Top Forums Programming "lvalue required as left operand of assignment" error in C Post 302577056 by achenle on Monday 28th of November 2011 05:57:35 AM
Old 11-28-2011
A little explanation of an "lvalue" might be in order.

An "lvalue" is something that can have the result of any computation assigned to it - it's pretty much some location in memory where you can put values. The statement "int abc;" declares and integer variable "abc", which can be an lvalue. The address of abc - "&abc" - is not an lvalue, because you can't assign a result to that - the address of the variable is the address. You can assign something to where that address points to by using the "*" operator, so "*( &abc )" is actually an lvalue. The integer constant "3" is not an lvalue.

The concept of an lvalue is pretty simple once you realize what it means.
 

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Class::Accessor::Lvalue(3pm)				User Contributed Perl Documentation			      Class::Accessor::Lvalue(3pm)

NAME
Class::Accessor::Lvalue - create Lvalue accessors SYNOPSIS
package Foo; use base qw( Class::Accessor::Lvalue ); __PACKAGE__->mk_accessors(qw( bar )) my $foo = Foo->new; $foo->bar = 42; print $foo->bar; # prints 42 DESCRIPTION
This module subclasses Class::Accessor in order to provide lvalue accessor makers. CAVEATS
o Though Class::Accessor mutators allows for the setting of multiple values to an attribute, the mutators that this module creates handle single scalar values only. This should not be too much of a hinderance as you can still explictly use an anonymous array. o Due to the hoops we have to jump through to preserve the Class::Accessor ->get and ->set behaviour this module is potentially slow. Should you not need the flexibility granted by the ->get and ->set methods, it's highly reccomended that you use Class::Acces- sor::Lvalue::Fast which is simpler and much faster. AUTHOR
Richard Clamp <richardc@unixbeard.net> with many thanks to Yuval Kogman for helping with the groovy lvalue tie magic used in the main class. COPYRIGHT
Copyright (C) 2003 Richard Clamp. All Rights Reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
Class::Accessor, Class::Accessor::Lvalue::Fast perl v5.8.8 2008-02-01 Class::Accessor::Lvalue(3pm)
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