NAME

Error::TypeTiny - exceptions for Type::Tiny and friends

SYNOPSIS

   use feature 'try';
   use Data::Dumper;
   use Types::Standard qw( Str );
   
   try {
      Str->assert_valid( undef );
   }
   catch ( $exception ) {
      warn "Encountered Error: $exception";
      warn Dumper( $exception->explain )
         if $exception->isa( "Error::TypeTiny::Assertion" );
   }

STATUS

This module is covered by the Type-Tiny stability policy.

DESCRIPTION

When Type::Tiny and its related modules encounter an error, they throw an exception object. These exception objects inherit from Error::TypeTiny.

Constructors

new(%attributes): Moose-style constructor function.
throw(%attributes): Constructs an exception and passes it to "die".
Automatically populates "context" and "stack_trace" if appropriate.
"throw_cb($callback, %attributes)": Constructs an exception and passes it to $callback which should be a coderef; if undef, uses "die".
Automatically populates "context" and "stack_trace" if appropriate.

Attributes

"message": The error message.
"context": Hashref containing the package, file and line that generated the error.
"stack_trace": A more complete stack trace. This feature requires Devel::StackTrace; use the $StackTrace package variable to switch it on.

Methods

"to_string": Returns the message, followed by the context if it is set.

Functions

"Error::TypeTiny::croak($format, @args)": Functional-style shortcut to "throw" method. Takes an "sprintf"-style format string and optional arguments to construct the "message".

Overloading

•: Stringification is overloaded to call "to_string".

Package Variables

%Carp::CarpInternal: Error::TypeTiny honours this package variable from Carp. ( %Error::TypeTiny::CarpInternal is an alias for it.)
$Error::TypeTiny::StackTrace: Boolean to toggle stack trace generation.
$Error::TypeTiny::LastError: A reference to the last exception object thrown.

CAVEATS

Although Error::TypeTiny objects are thrown for errors produced by Type::Tiny, that doesn't mean every time you use Type::Tiny you'll get Error::TypeTinys whenever you want.

For example, if you use a Type::Tiny type constraint in a Moose attribute, Moose will not call the constraint's "assert_valid" method (which throws an exception). Instead it will call "check" and "get_message" (which do not), and will "confess" an error message of its own. (The $LastError package variable may save your bacon.)

BUGS

Please report any bugs to <https://github.com/tobyink/p5-type-tiny/issues>.

AUTHOR

Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

DISCLAIMER OF WARRANTIES

THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.