=head1 NAME

Mouse::XS - A Mouse guts in XS

=head1 VERSION

This document describes Mouse version 2.0.0

=head1 DESCRIPTION

Mouse has an optional XS implementation, which is automatically built
and used if available. According to benchmarks, this is about 2 times
faster than Mouse::PurePerl.

=head2 INSTALL

The XS implementation are selected by default, but you can force it by
passing the C<--xs> option to F<Makefile.PL>.

    perl Makefile.PL --xs

If you do not want to build the XS implementation, you can pass the C<--pp>
option to F<Makefile.PL>.

    perl Makefile.PL --pp

Or if you use C<cpanm> (>= 1.7), you can give C<--pp> option to C<cpanm>.

    cpanm --pp Mouse

=head2 The MOUSE_PUREPERL (or PERL_ONLY) environment variable

It can be used to enable the use of Mouse::PurePerl in order to test
and debug programs that use Mouse.

=head1 CAVEAT

There are some Mouse::XS specific features.

=over

=item Mutating references to the return values of getters

When you take a reference from Mouse getters, like C<< $ref = \$obj->foo >>,
the C<$ref> refers C<< \$obj->{foo} >>. That is, mutating C<$$ref> also
alters C<< $obj->{foo} >>. The behavior may confuse you so you'd better avoid to take a reference directly from getters.

See L<https://rt.cpan.org/Ticket/Display.html?id=82945> for details.

=back

=head1 DEPENDENCIES

The XS implementation requires Perl 5.8.1 or later, and a C compiler.

=head1 SEE ALSO

L<Mouse>

L<Mouse::PurePerl>

=cut