--- name: "Mail::Message::Field::Fast" section: "3pm" platform: "linux" package: "perl-mail-message" version: "4.05-1" release: "Arch Linux 2026-11-01" platforms: ["linux"] url: "https://new.carta.tech/Mail::Message::Field::Fast" --- # Mail::Message::Field::Fast(3pm) one line of a message header ## NAME Mail::Message::Field::Fast - one line of a message header ## INHERITANCE ``` Mail::Message::Field::Fast is a Mail::Message::Field is a Mail::Reporter ``` ## SYNOPSIS ``` See Mail::Message::Field ``` ## DESCRIPTION This is the faster, but less flexible implementation of a header field. The data is stored in an array, and some hacks are made to speeds things up. Be gentle with me, and consider that each message contains many of these lines, so speed is very important here. Extends "DESCRIPTION" in Mail::Message::Field. ## OVERLOADED Extends "OVERLOADED" in Mail::Message::Field. - overload: **'""'** stringification Inherited, see "OVERLOADED" in Mail::Message::Field - overload: **'0+'** numification Inherited, see "OVERLOADED" in Mail::Message::Field - overload: **'\<=**'\> numeric comparison Inherited, see "OVERLOADED" in Mail::Message::Field - overload: **bool** boolean Inherited, see "OVERLOADED" in Mail::Message::Field - overload: **cmp** string comparison Inherited, see "OVERLOADED" in Mail::Message::Field ## METHODS Extends "METHODS" in Mail::Message::Field. ### Constructors Extends "Constructors" in Mail::Message::Field. - $obj-\>**clone**() Inherited, see "Constructors" in Mail::Message::Field - $class-\>**new**(($line \| $name, $body, \[$attributes\]), %options) The constructor of this object does not follow the usual practise within the Mail::Box suite: it does not use the constructor **Mail::Reporter::new()**. The method can be used in one of the following ways: - • **new**(`$line`, `%options`) Pass a `$line` as it could be found in a file: a (possibly folded) line which is terminated by a new-line. - • **new**(`$name`, `$body`, \[`$attributes`\], `%options`) A set of values which shape the line. Create a new header field object. Specify the whole `$line` (encoded octets) at once, and it will be split-up for you. I case you already have the parts of the header line, you may specify them separately as `$name` and field `$body`. In case you specify a single `$body` object, or an ARRAY of objects, these are processed to become suitable to fill a field, usually by simple strification. When you specify one or more Mail::Address objects, these are transformed into a string using their `"format"` method. You may also add one Mail::Message::Field, whose body is taken. In case of an array, the elements are joined into one string with a comma. The `$attributes` can be exactly one string which may contain multiple attributes at once, quoted and formatted as required in RFC2822. As alternative, list of key-value pairs can be used. In this case, the values will get quoted if needed and everything formatted as the protocol demands. Improves base, see "Constructors" in Mail::Message::Field » example: ``` my $mime = Mail::Message::Field->new( 'Content-Type: text/plain; charset=US-ASCII'); my $mime = Mail::Message::Field->new( 'Content-Type' => 'text/plain; charset=US-ASCII'); my $mime = Mail::Message::Field->new( 'Content-Type' => 'text/plain', 'charset=US-ASCII'); my $mime = Mail::Message::Field->new( 'Content-Type' => 'text/plain', charset => 'Latin1'); my $mime = Mail::Message::Field->new( To => Mail::Address->new('My', 'me@example.com'); my $mime = Mail::Message::Field->new( Cc => [ Mail::Address->new('You', 'you@example.com'), Mail::Address->new('His', 'he@example.com') ]); ``` But in practice, you can simply call ``` my $head = Mail::Message::Head->new; $head->add( 'Content-Type' => 'text/plain', charset => 'utf8'); ``` which implicitly calls this constructor (when needed). You can specify the same things for **Mail::Message::Head::Complete::add()** as this `"new"` accepts. ### Attributes Extends "Attributes" in Mail::Message::Field. - $obj-\>**Name**() Inherited, see "Attributes" in Mail::Message::Field - $obj-\>**body**() Inherited, see "Attributes" in Mail::Message::Field - $obj-\>**folded**() Inherited, see "Attributes" in Mail::Message::Field - $obj-\>**foldedBody**( \[$body\] ) Inherited, see "Attributes" in Mail::Message::Field - $obj-\>**name**() Inherited, see "Attributes" in Mail::Message::Field - $obj-\>**unfoldedBody**( \[$body, \[$wrap\]\] ) Inherited, see "Attributes" in Mail::Message::Field - $obj-\>**wellformedName**( \[STRING\] ) Inherited, see "Attributes" in Mail::Message::Field ### The field Extends "The field" in Mail::Message::Field. - $any-\>**isStructured**( \[$name\] ) Inherited, see "The field" in Mail::Message::Field - $obj-\>**length**() Inherited, see "The field" in Mail::Message::Field - $obj-\>**nrLines**() Inherited, see "The field" in Mail::Message::Field - $obj-\>**print**( \[$fh\] ) Inherited, see "The field" in Mail::Message::Field - $obj-\>**size**() Inherited, see "The field" in Mail::Message::Field - $obj-\>**string**( \[$wrap\] ) Inherited, see "The field" in Mail::Message::Field - $obj-\>**toDisclose**() Inherited, see "The field" in Mail::Message::Field ### Access to the content Extends "Access to the content" in Mail::Message::Field. - $obj-\>**addresses**() Inherited, see "Access to the content" in Mail::Message::Field - $obj-\>**attribute**( $name, \[$value\] ) Inherited, see "Access to the content" in Mail::Message::Field - $obj-\>**attributes**() Inherited, see "Access to the content" in Mail::Message::Field - $obj-\>**comment**( \[STRING\] ) Inherited, see "Access to the content" in Mail::Message::Field - $any-\>**dateToTimestamp**(STRING) Inherited, see "Access to the content" in Mail::Message::Field - $any-\>**stripCFWS**( \[STRING\] ) Inherited, see "Access to the content" in Mail::Message::Field - $obj-\>**study**() Inherited, see "Access to the content" in Mail::Message::Field - $any-\>**toDate**( \[$time\] ) Inherited, see "Access to the content" in Mail::Message::Field - $obj-\>**toInt**() Inherited, see "Access to the content" in Mail::Message::Field ### Parsing Extends "Parsing" in Mail::Message::Field. - $obj-\>**consume**( $line \| \<$name,\<$body\|$objects\>\> ) Inherited, see "Parsing" in Mail::Message::Field - $obj-\>**defaultWrapLength**( \[$length\] ) Inherited, see "Parsing" in Mail::Message::Field - $any-\>**fold**( $name, $body, \[$maxchars\] ) Inherited, see "Parsing" in Mail::Message::Field - $obj-\>**setWrapLength**( \[$length\] ) Inherited, see "Parsing" in Mail::Message::Field - $obj-\>**stringifyData**(STRING\|ARRAY\|$objects) Inherited, see "Parsing" in Mail::Message::Field - $obj-\>**unfold**(STRING) Inherited, see "Parsing" in Mail::Message::Field ### Error handling Extends "Error handling" in Mail::Message::Field. - $obj-\>**AUTOLOAD**() Inherited, see "Error handling" in Mail::Reporter - $obj-\>**notImplemented**() Inherited, see "Error handling" in Mail::Reporter ### Cleanup Extends "Cleanup" in Mail::Message::Field. - $obj-\>**DESTROY**() Inherited, see "Cleanup" in Mail::Reporter ## DETAILS Extends "DETAILS" in Mail::Message::Field. ## DIAGNOSTICS - Error: class $package does not implement method $method. Fatal error: the specific `$package` (or one of its superclasses) does not implement this method where it should. This message means that some other related classes do implement this method however the class at hand does not. Probably you should investigate this and probably inform the author of the package. Cast by `notImplemented()` - Warning: field content is not numerical: $content The numeric value of a field is requested (for instance the `"Lines"` or `"Content-Length"` fields should be numerical), however the data contains weird characters. Cast by `toInt()` - Error: field name too long (max $count), in '$name'. It is not specified in the RFCs how long a field name can be, but at least it should be a few characters shorter than the line wrap. Cast by `fold()` - Warning: illegal character in field name $name. A new field is being created which does contain characters not permitted by the RFCs. Using this field in messages may break other e-mail clients or transfer agents, and therefore mutulate or extinguish your message. Cast by `consume()` ## SEE ALSO This module is part of Mail-Message version 4.05, built on April 10, 2026. Website: *http://perl.overmeer.net/mailbox/* ## LICENSE For contributors see file ChangeLog. This software is copyright (c) 2001-2026 by Mark Overmeer. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.