NAME Class::XSAccessor - Generate fast XS accessors without runtime compilation SYNOPSIS package MyClass; use Class::XSAccessor constructor => 'new', getters => { get_foo => 'foo', # 'foo' is the hash key to access get_bar => 'bar', }, setters => { set_foo => 'foo', set_bar => 'bar', }, accessors => { foo => 'foo', bar => 'bar', }, predicates => { has_foo => 'foo', has_bar => 'bar', }; # The imported methods are implemented in fast XS. # normal class code here. DESCRIPTION Class::XSAccessor implements fast read, write and read/write accessors in XS. Additionally, it can provide predicates such as "has_foo()" for testing whether the attribute "foo" is defined in the object. It only works with objects that are implemented as ordinary hashes. Class::XSAccessor::Array implements the same interface for objects that use arrays for their internal representation. Since version 0.10, the module can also generate simple constructors (implemented in XS) for you. Simply supply the "constructor => 'constructor_name'" option or the "constructors => ['new', 'create', 'spawn']" option. These constructors do the equivalent of the following perl code: sub new { my $class = shift; return bless { @_ }, ref($class)||$class; } That means they can be called on objects and classes but will not clone objects entirely. The XS accessor methods were between 1.6 and 2.5 times faster than typical pure-perl accessors in some simple benchmarking. The lower factor applies to the potentially slightly obscure "sub set_foo_pp {$_[0]->{foo} = $_[1]}", so if you usually write clear code, a factor of two speed-up is a good estimate. The method names may be fully qualified. In the example of the synopsis, you could have written "MyClass::get_foo" instead of "get_foo". This way, you can install methods in classes other than the current class. See also: The "class" option below. By default, the setters return the new value that was set and the accessors (mutators) do the same. You can change this behaviour with the "chained" option, see below. The predicates obviously return a boolean. OPTIONS In addition to specifying the types and names of accessors, you can add options which modify behaviour. The options are specified as key/value pairs just as the accessor declaration. Example: use Class::XSAccessor getters => { get_foo => 'foo', }, replace => 1; The list of available options is: replace Set this to a true value to prevent "Class::XSAccessor" from complaining about replacing existing subroutines. chained Set this to a true value to change the return value of setters and mutators (when called with an argument). If "chained" is enabled, the setters and accessors/mutators will return the object. Mutators called without an argument still return the value of the associated attribute. As with the other options, "chained" affects all methods generated in the same "use Class::XSAccessor ..." statement. class By default, the accessors are generated in the calling class. Using the "class" option, you can explicitly specify where the methods are to be generated. CAVEATS Probably wouldn't work if your objects are *tied* hashes. But that's a strange thing to do anyway. Scary code exploiting strange XS features. If you think writing an accessor in XS should be a laughably simple exercise, then please contemplate how you could instantiate a new XS accessor for a new hash key that's only known at run-time. Note that compiling C code at run-time a la Inline::C is a no go. SEE ALSO Class::XSAccessor::Array AutoXS AUTHOR Steffen Mueller, Chocolateboy, COPYRIGHT AND LICENSE Copyright (C) 2008 by Steffen Mueller This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8 or, at your option, any later version of Perl 5 you may have available.