Moose::Meta::TypeConstraint->new(%options)
This creates a new type constraint based on the provided %options:
• name
The constraint name. If a name is not provided, it will be set to "__ANON__".
• parent
A "Moose::Meta::TypeConstraint" object which is the parent type for the type being created. This is
optional.
• constraint
This is the subroutine reference that implements the actual constraint check. This defaults to a
subroutine which always returns true.
• message
A subroutine reference which is used to generate an error message when the constraint fails. This is
optional.
• coercion
A Moose::Meta::TypeCoercion object representing the coercions to the type. This is optional.
• inlined
A subroutine which returns a string suitable for inlining this type constraint. It will be called as
a method on the type constraint object, and will receive a single additional parameter, a variable
name to be tested (usually "$_" or "$_[0]".
This is optional.
• inline_environment
A hash reference of variables to close over. The keys are variables names, and the values are
references to the variables.
$constraint->equals($type_name_or_object)
Returns true if the supplied name or type object is the same as the current type.
$constraint->is_subtype_of($type_name_or_object)
Returns true if the supplied name or type object is a parent of the current type.
$constraint->is_a_type_of($type_name_or_object)
Returns true if the given type is the same as the current type, or is a parent of the current type. This
is a shortcut for checking "equals" and "is_subtype_of".
$constraint->coerce($value)
This will attempt to coerce the value to the type. If the type does not have any defined coercions this
will throw an error.
If no coercion can produce a value matching $constraint, the original value is returned.
$constraint->assert_coerce($value)
This method behaves just like "coerce", but if the result is not valid according to $constraint, an error
is thrown.
$constraint->check($value)
Returns true if the given value passes the constraint for the type.
$constraint->validate($value)
This is similar to "check". However, if the type isvalid then the method returns an explicit "undef". If
the type is not valid, we call "$self->get_message($value)" internally to generate an error message.
$constraint->assert_valid($value)
Like "check" and "validate", this method checks whether $value is valid under the constraint. If it is,
it will return true. If it is not, an exception will be thrown with the results of
"$self->get_message($value)".
$constraint->name
Returns the type's name, as provided to the constructor.
$constraint->parent
Returns the type's parent, as provided to the constructor, if any.
$constraint->has_parent
Returns true if the type has a parent type.
$constraint->parents
Returns all of the types parents as an list of type constraint objects.
$constraint->constraint
Returns the type's constraint, as provided to the constructor.
$constraint->get_message($value)
This generates a method for the given value. If the type does not have an explicit message, we generate a
default message.
$constraint->has_message
Returns true if the type has a message.
$constraint->message
Returns the type's message as a subroutine reference.
$constraint->coercion
Returns the type's Moose::Meta::TypeCoercion object, if one exists.
$constraint->has_coercion
Returns true if the type has a coercion.
$constraint->can_be_inlined
Returns true if this type constraint can be inlined. A type constraint which subtypes an inlinable
constraint and does not add an additional constraint "inherits" its parent type's inlining.
$constraint->create_child_type(%options)
This returns a new type constraint of the same class using the provided %options. The "parent" option
will be the current type.
This method exists so that subclasses of this class can override this behavior and change how child types
are created.
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