NAME

Type::Exception - exceptions for Type::Tiny and friends

SYNOPSIS

   use Data::Dumper;
   use Try::Tiny;
   use Types::Standard qw(Str);
   
   try {
      Str->assert_valid(undef);
   }
   catch {
      my $exception = shift;
      warn "Encountered Error: $exception";
      warn Dumper($exception->explain)
         if $exception->isa("Type::Exception::Assertion");
   };

DESCRIPTION

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

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.

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

Type::Exception::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

%Type::Tiny::CarpInternal

Serves a similar purpose to %Carp::CarpInternal.

$Type::Tiny::StackTrace

Boolean to toggle stack trace generation.

$Type::Tiny::LastError

A reference to the last exception object thrown.

CAVEATS

Although Type::Exception objects are thrown for errors produced by Type::Tiny, that doesn't mean every time you use Type::Tiny you'll get Type::Exceptions 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 http://rt.cpan.org/Dist/Display.html?Queue=Type-Tiny.

SEE ALSO

Type::Exception::Assertion, Type::Exception::WrongNumberOfParameters.

Try::Tiny, Try::Tiny::ByClass.

AUTHOR

Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

This software is copyright (c) 2013 by Toby Inkster.

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.

cpanm Type::Tiny

perl -MCPAN -e shell
install Type::Tiny