# CPAN::Meta::Prereqs - phpMan

## NAME
    [CPAN::Meta::Prereqs] - a set of distribution prerequisites by phase and
    type

## VERSION
    version 2.150010

## DESCRIPTION
    A [CPAN::Meta::Prereqs] object represents the prerequisites for a CPAN
    distribution or one of its optional features. Each set of prereqs is
    organized by phase and type, as described in [CPAN::Meta::Prereqs].

## METHODS
  new
      my $prereq = [CPAN::Meta::Prereqs]->new( \%prereq_spec );

    This method returns a new set of Prereqs. The input should look like the
    contents of the "prereqs" field described in [CPAN::Meta::Spec], meaning
    something more or less like this:

      my $prereq = [CPAN::Meta::Prereqs]->new({
        runtime => {
          requires => {
            '[Some::Module]' => '1.234',
            ...,
          },
          ...,
        },
        ...,
      });

    You can also construct an empty set of prereqs with:

      my $prereqs = [CPAN::Meta::Prereqs]->new;

    This empty set of prereqs is useful for accumulating new prereqs before
    finally dumping the whole set into a structure or string.

  requirements_for
      my $requirements = $prereqs->requirements_for( $phase, $type );

    This method returns a [CPAN::Meta::Requirements] object for the given
    phase/type combination. If no prerequisites are registered for that
    combination, a new [CPAN::Meta::Requirements] object will be returned, and
    it may be added to as needed.

    If $phase or $type are undefined or otherwise invalid, an exception will
    be raised.

  phases
      my @phases = $prereqs->phases;

    This method returns the list of all phases currently populated in the
    prereqs object, suitable for iterating.

  types_in
      my @runtime_types = $prereqs->types_in('runtime');

    This method returns the list of all types currently populated in the
    prereqs object for the provided phase, suitable for iterating.

  with_merged_prereqs
      my $new_prereqs = $prereqs->with_merged_prereqs( $other_prereqs );

      my $new_prereqs = $prereqs->with_merged_prereqs( \@other_prereqs );

    This method returns a new [CPAN::Meta::Prereqs] objects in which all the
    other prerequisites given are merged into the current set. This is
    primarily provided for combining a distribution's core prereqs with the
    prereqs of one of its optional features.

    The new prereqs object has no ties to the originals, and altering it
    further will not alter them.

  merged_requirements
        my $new_reqs = $prereqs->merged_requirements( \@phases, \@types );
        my $new_reqs = $prereqs->merged_requirements( \@phases );
        my $new_reqs = $prereqs->merged_requirements();

    This method joins together all requirements across a number of phases
    and types into a new [CPAN::Meta::Requirements] object. If arguments are
    omitted, it defaults to "runtime", "build" and "test" for phases and
    "requires" and "recommends" for types.

  as_string_hash
    This method returns a hashref containing structures suitable for dumping
    into a distmeta data structure. It is made up of hashes and strings,
    only; there will be no Prereqs, [CPAN::Meta::Requirements], or "version"
    objects inside it.

  is_finalized
    This method returns true if the set of prereqs has been marked
    "finalized," and cannot be altered.

  finalize
    Calling "finalize" on a Prereqs object will close it for further
    modification. Attempting to make any changes that would actually alter
    the prereqs will result in an exception being thrown.

  clone
      my $cloned_prereqs = $prereqs->clone;

    This method returns a Prereqs object that is identical to the original
    object, but can be altered without affecting the original object.
    Finalization does not survive cloning, meaning that you may clone a
    finalized set of prereqs and then modify the clone.

## BUGS
    Please report any bugs or feature using the CPAN Request Tracker. Bugs
    can be submitted through the web interface at
    <<http://rt.cpan.org/Dist/Display.html?Queue=CPAN-Meta>>

    When submitting a bug or request, please include a test-file or a patch
    to an existing test-file that illustrates the bug or desired feature.

## AUTHORS
    *   David Golden <<dagolden@cpan.org>>

    *   Ricardo Signes <<rjbs@cpan.org>>

    *   Adam Kennedy <<adamk@cpan.org>>

## COPYRIGHT AND LICENSE
    This software is copyright (c) 2010 by David Golden, Ricardo Signes,
    Adam Kennedy and Contributors.

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