Attribute::Lazy
Attribute::Lazy
Lazy attribute initialisation for Raku classes
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Synopsis
use Attribute::Lazy;
class Foo {
has $.foo will lazy { "zub" };
}
Description
This is based on an experimental trait that was briefly in the Rakudo core.
Attribute::Lazy provides a single trait will lazy that will allow an attribute with a public accessor (that is one defined with the "." twigil,) to be initialised the first time it is accessed by the result of the supplied block. This might be useful if the value may not be used and may be expensive to calculate (or various other reasons that haven't been thought of.)
For convenience the block is passed the object instance as a single argument.
Installation
Assuming you have a working Rakudo Raku installation you should be able to install this with zef :
# From the source directory
zef install .
# Remote installation
zef install Attribute::Lazy
Other install mechanisms may be become available in the future.
Support
Suggestions/patches are welcomed via github at https://github.com/jonathanstowe/Attribute-Lazy/issues
Licence
Please see the LICENCE file in the distribution
© Rakudo Contributors 2015 © Jonathan Stowe 2016-2021