NAME

CHI::Cascade::Value - a class for valid values

SYNOPSIS

You can use it class for a returning of values by exceptions. For example:

    die CHI::Cascade::Value->new

This throws an exception with nothing value. If you do it from your recompute code your "run" in CHI::Cascade method will return an old value from cache or if it's not in cache it will return an undef value.

Or

    die CHI::Cascade::Value->new->value( $any_value );
    die CHI::Cascade::Value->new->value( undef );

This throws an exception with valid value. Please note that undef is valid value too! But bacause the "run" in CHI::Cascade method returns only a value (not instance of CHI::Cascade::Value object) there is not recommended to use undef values (run method returns undef when it cannot get a value right now).

Please use it class only in special cases - when you need to break recopmuting, want to return an specific value only for once execution of "run" in CHI::Cascade method and don't want to save value in cache.

CONSTRUCTOR

    $value = CHI::Cascade::Value->new;

It will create instance $value with nothing value

METHODS

value

Examples:

    $value->value
    $value->value( $new_value )

You can use it to get/set a value of $value. An undef value is valid too! First version returns a value, second sets a value and returns $value.

is_value

    $value->is_value

returns true if value was set by "value" method or false else.

AUTHOR

This module has been written by Perlover <perlover@perlover.com>

LICENSE

This module is free software and is published under the same terms as Perl itself.

SEE ALSO

CHI::Cascade