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package List::Objects::WithUtils::Role::Hash::Typed; |
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use strictures 1; |
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use Carp (); |
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use Scalar::Util (); |
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use Type::Tie (); |
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use Role::Tiny; |
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requires 'type', 'new'; |
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around type => sub { tied(%{$_[1]})->type }; |
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around new => sub { |
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my (undef, $class, $type) = splice @_, 0, 2; |
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if (my $blessed = Scalar::Util::blessed $class) { |
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$type = $class->type; |
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$class = $blessed; |
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} else { |
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$type = shift; |
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} |
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Carp::confess "Expected a Type::Tiny type but got '$type'" |
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unless Scalar::Util::blessed($type) |
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&& $type->isa('Type::Tiny'); |
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my $self = {}; |
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tie(%$self, 'Type::Tie::HASH', $type); |
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%$self = @_; |
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bless $self, $class; |
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}; |
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1; |
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=pod |
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=for Pod::Coverage new hash_of |
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=head1 NAME |
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List::Objects::WithUtils::Role::Hash::Typed - Type-checking hash behavior |
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=head1 SYNOPSIS |
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# Via List::Objects::WithUtils::Hash::Typed -> |
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use List::Objects::WithUtils 'hash_of'; |
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use Types::Standard -all; |
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my $arr = hash_of(Int, foo => 1, bar => 2); |
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$arr->set(baz => 3.14159); # dies, failed type check |
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=head1 DESCRIPTION |
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This role makes use of L<Type::Tie> to add type-checking behavior to |
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L<List::Objects::WithUtils::Role::Hash> consumers. |
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The first argument passed to the constructor should be a L<Type::Tiny> type: |
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use Types::Standard -all; |
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my $arr = hash_of ArrayRef() => (foo => [], bar => []); |
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Values are checked against the specified type when the object is constructed |
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or new elements are added. |
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If the initial type-check fails, a coercion is attempted. |
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Values that cannot be coerced will throw an exception. |
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Also see L<Types::Standard>, L<List::Objects::Types> |
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=head2 type |
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Returns the L<Type::Tiny> type the object was created with. |
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=head1 AUTHOR |
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Jon Portnoy <avenj@cobaltirc.org>; typed hashes implemented by Toby Inkster |
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(CPAN: TOBYINK) |
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80
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=cut |
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