# man > Mail::Message::Field::Fast(3pm)

## NAME
    [Mail::Message::Field::Fast](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField%3A%3AFast/markdown) - one line of a message header

## INHERITANCE
     [Mail::Message::Field::Fast](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField%3A%3AFast/markdown)
       is a [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)
       is a [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

## SYNOPSIS
     See [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

## 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](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown).

## OVERLOADED
    Extends "OVERLOADED" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown).

    overload: ""
        Inherited, see "OVERLOADED" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    overload: 0+
        Inherited, see "OVERLOADED" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    overload: <=>
        Inherited, see "OVERLOADED" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    overload: bool
        Inherited, see "OVERLOADED" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    overload: cmp
        Inherited, see "OVERLOADED" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

## METHODS
    Extends "METHODS" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown).

### Constructors
    Extends "Constructors" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown).

    $obj->clone()
        Inherited, see "Constructors" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    [Mail::Message::Field::Fast](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField%3A%3AFast/markdown)->new($data)
        The constructor of this object does not follow the usual practise within the [Mail::Box](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3ABox/markdown)
        suite: it does not use the constructor [Mail::Reporter::new](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter%3A%3Anew/markdown)(). Therefor it has no logging or
        tracing facilities.

        The method can be used in one of the following ways:

        *   new LINE

            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|OBJECTS), [ATTRIBUTES]

            A set of values which shape the line.

        Create a new header field object. Specify the whole LINE 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 BODY.

        In case you specify a single OBJECT, or a reference to an array of OBJECTS, these objects
        are processed to become suitable to fill a field, usually by simple strification. When you
        specify one or more [Mail::Address](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AAddress/markdown) objects, these are transformed into a string using their
        "format" method. You may also add one [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown), whose body is taken. In case of
        an array, the elements are joined into one string with a comma.

        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.

         -Option--Defined in     --Default
          log     [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)   <disabled>
          trace   [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)   <disabled>

        log => LEVEL
        trace => LEVEL

        example:

         my $mime = [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)->new(
          'Content-Type: text/plain; charset=US-ASCII');

         my $mime = [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)->new(
          'Content-Type' => 'text/plain; charset=US-ASCII');

         my $mime = [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)->new(
          'Content-Type' => 'text/plain', 'charset=US-ASCII');

         my $mime = [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)->new(
          'Content-Type' => 'text/plain', charset => 'Latin1');

         my $mime = [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)->new(
          To => [Mail::Address](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AAddress/markdown)->new('My', '<me@example.com>');

         my $mime = [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)->new(
          Cc => [ [Mail::Address](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AAddress/markdown)->new('You', '<you@example.com>')
                , [Mail::Address](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AAddress/markdown)->new('His', '<he@example.com>')
                ]);

        But in practice, you can simply call

         my $head = [Mail::Message::Head](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AHead/markdown)->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](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AHead%3A%3AComplete%3A%3Aadd/markdown)() as this "new" accepts.

### The field
    Extends "The field" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown).

    $obj->isStructured()
    [Mail::Message::Field::Fast](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField%3A%3AFast/markdown)->isStructured()
        Inherited, see "The field" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->length()
        Inherited, see "The field" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->nrLines()
        Inherited, see "The field" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->print( [$fh] )
        Inherited, see "The field" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->size()
        Inherited, see "The field" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->string( [$wrap] )
        Inherited, see "The field" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->toDisclose()
        Inherited, see "The field" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

### Access to the name
    Extends "Access to the name" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown).

    $obj->Name()
        Inherited, see "Access to the name" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->name()
        Inherited, see "Access to the name" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->wellformedName( [STRING] )
        Inherited, see "Access to the name" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

### Access to the body
    Extends "Access to the body" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown).

    $obj->body()
        Inherited, see "Access to the body" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->folded()
        Inherited, see "Access to the body" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->foldedBody( [$body] )
        Inherited, see "Access to the body" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->stripCFWS( [STRING] )
    [Mail::Message::Field::Fast](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField%3A%3AFast/markdown)->stripCFWS( [STRING] )
        Inherited, see "Access to the body" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->unfoldedBody( [$body, [$wrap]] )
        Inherited, see "Access to the body" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

### Access to the content
    Extends "Access to the content" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown).

    $obj->addresses()
        Inherited, see "Access to the content" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->attribute( $name, [$value] )
        Inherited, see "Access to the content" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->attributes()
        Inherited, see "Access to the content" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->comment( [STRING] )
        Inherited, see "Access to the content" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->study()
        Inherited, see "Access to the content" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->toDate( [$time] )
    [Mail::Message::Field::Fast](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField%3A%3AFast/markdown)->toDate( [$time] )
        Inherited, see "Access to the content" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->toInt()
        Inherited, see "Access to the content" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

### Other methods
    Extends "Other methods" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown).

    $obj->dateToTimestamp(STRING)
    [Mail::Message::Field::Fast](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField%3A%3AFast/markdown)->dateToTimestamp(STRING)
        Inherited, see "Other methods" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

### Internals
    Extends "Internals" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown).

    $obj->consume( $line | <$name,<$body|$objects>> )
        Inherited, see "Internals" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->defaultWrapLength( [$length] )
        Inherited, see "Internals" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->fold( $name, $body, [$maxchars] )
    [Mail::Message::Field::Fast](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField%3A%3AFast/markdown)->fold( $name, $body, [$maxchars] )
        Inherited, see "Internals" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->setWrapLength( [$length] )
        Inherited, see "Internals" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->stringifyData(STRING|ARRAY|$objects)
        Inherited, see "Internals" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

    $obj->unfold(STRING)
        Inherited, see "Internals" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown)

### Error handling
    Extends "Error handling" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown).

    $obj->AUTOLOAD()
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->addReport($object)
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->defaultTrace( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )
    [Mail::Message::Field::Fast](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField%3A%3AFast/markdown)->defaultTrace( [$level]|[$loglevel, $tracelevel]|[$level, $callback]
    )
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->errors()
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->log( [$level, [$strings]] )
    [Mail::Message::Field::Fast](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField%3A%3AFast/markdown)->log( [$level, [$strings]] )
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->logPriority($level)
    [Mail::Message::Field::Fast](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField%3A%3AFast/markdown)->logPriority($level)
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->logSettings()
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->notImplemented()
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->report( [$level] )
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->reportAll( [$level] )
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->trace( [$level] )
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

    $obj->warnings()
        Inherited, see "Error handling" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

### Cleanup
    Extends "Cleanup" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown).

    $obj->DESTROY()
        Inherited, see "Cleanup" in [Mail::Reporter](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AReporter/markdown)

## DETAILS
    Extends "DETAILS" in [Mail::Message::Field](https://www.chedong.com/phpMan.php/perldoc/Mail%3A%3AMessage%3A%3AField/markdown).

## DIAGNOSTICS
    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.

    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.

    Error: Package $package does not implement $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.

## SEE ALSO
    This module is part of Mail-Message distribution version 3.012, built on February 11, 2022.
    Website: <http://perl.overmeer.net/CPAN/>

## LICENSE
    Copyrights 2001-2022 by [Mark Overmeer <<markov@cpan.org>>]. For other contributors see ChangeLog.

    This program is free software; you can redistribute it and/or modify it under the same terms as
    Perl itself. See <http://dev.perl.org/licenses/>