X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FFunction%2FParameters.pm;fp=lib%2FFunction%2FParameters.pm;h=916bc504e3952d4f992a12b133425c59b8e149c1;hb=0175ff9a8975c8f41006fe3cb4ccd5a44b4758dc;hp=4c040d1bb02a7b22bb2343388e1ab81e945c54d8;hpb=a4c13d402a1fdcab88937f6c1db91c399d2ae254;p=p5sagit%2FFunction-Parameters.git diff --git a/lib/Function/Parameters.pm b/lib/Function/Parameters.pm index 4c040d1..916bc50 100644 --- a/lib/Function/Parameters.pm +++ b/lib/Function/Parameters.pm @@ -659,6 +659,44 @@ affects the file that is currently being compiled. # or Function::Parameters->import(@custom_import_args); } +=head2 Experimental feature: Types + +An experimental feature is now available: You can annotate parameters with +L. That is, before each parameter you can put +a type specification consisting of identifiers (C), unions (C<... | ...>), +and parametric types (C<...[...]>). Example: + + fun foo(Int $n, ArrayRef[String | CodeRef] $cb) { ... } + +If you do this, L will be loaded automatically (if that hasn't happened +yet). These specifications are parsed and validated using +L|Moose::Util::TypeConstraints/find_or_parse_type_constraint>. + +If you are in "lax" mode, nothing further happens and the types are ignored. If +you are in "strict" mode, C generates code to make sure +any values passed in conform to the type (via +L<< C<< $constraint->check($value) >>|Moose::Meta::TypeConstraint/$constraint->check($value) >>. + +In addition, these type constraints are inspectable through the +L object returned by +L|/Introspection>. + +=head2 Experimental experimental feature: Type expressions + +An even more experimental feature is the ability to specify arbitrary +expressions as types. The syntax for this is like the literal types described +above, but with an expression wrapped in parentheses (C<( EXPR )>). Example: + + fun foo(('Int') $n, ($othertype) $x) { ... } + +Every type expression must return either a string (which is resolved as for +literal types), or a L +(providing C and C methods). + +Note that these expressions are evaluated (once) at parse time (similar to +C blocks), so make sure that any variables you use are set and any +functions you call are defined at parse time. + =head2 How it works The module is actually written in L and uses @@ -676,6 +714,39 @@ generated code corresponds to: # ... turns into ... sub bar :method { my $self = shift; my ($x, $y, @z) = @_; sub bar; ... } +=head1 SUPPORT AND DOCUMENTATION + +After installing, you can find documentation for this module with the +perldoc command. + + perldoc Function::Parameters + +You can also look for information at: + +=over + +=item MetaCPAN + +L + +=item RT, CPAN's request tracker + +L + +=item AnnoCPAN, Annotated CPAN documentation + +L + +=item CPAN Ratings + +L + +=item Search CPAN + +L + +=back + =head1 SEE ALSO L