X::Parameter::Default Reference
Compilation error due to an unallowed default value in a signature
What it is #
Routines #
Signatures are reproduced from the documentation, including their declared return types. A routine listed here is part of the type's published interface; whether Raku++ implements it is a separate question, answered by the examples below.
method how #
Returns a string describing how the parameter is qualified that makes it disallow default values, for example "slurpy" or "mandatory".
method parameter #
Returns the parameter name
Examples, run three ways #
Every example below comes from the official documentation, together with the output that documentation asserts. Each was then executed by Rakudo and by Raku++ when this page was built. Where the three agree, one result is shown; where they do not, all three are — because which of them is wrong is exactly the information worth having.
5 no-output
class X::Parameter::Default does X::Comp { }Not executed: the documentation states no expected output for this example.
sub f($x! = 3) { }Not executed: the documentation states no expected output for this example.
Cannot put default on required parameter $x
Not executed: the documentation states no expected output for this example.
sub f(*@ = 3) { }Not executed: the documentation states no expected output for this example.
Cannot put default on anonymous slurpy parameter
Not executed: the documentation states no expected output for this example.