X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMouse%2FMeta%2FTypeConstraint.pm;h=48971697b301b83f2cc8917e8b8a025d2a16de11;hb=6a7756cc831fa21bc28b924a8edbaeeb28a4a66b;hp=1df270dceee83d58d476c3f2d80167c238214f23;hpb=c5940bae3f593d389abce62204268e1a4be33f7d;p=gitmo%2FMouse.git

diff --git a/lib/Mouse/Meta/TypeConstraint.pm b/lib/Mouse/Meta/TypeConstraint.pm
index 1df270d..4897169 100644
--- a/lib/Mouse/Meta/TypeConstraint.pm
+++ b/lib/Mouse/Meta/TypeConstraint.pm
@@ -1,6 +1,5 @@
 package Mouse::Meta::TypeConstraint;
 use Mouse::Util qw(:meta); # enables strict and warnings
-use Scalar::Util ();
 
 sub new {
     my $class = shift;
@@ -8,12 +7,15 @@ sub new {
 
     $args{name} = '__ANON__' if !defined $args{name};
 
-    if($args{parent}) {
+    if(defined $args{parent}) {
         %args = (%{$args{parent}}, %args);
         # a child type must not inherit 'compiled_type_constraint'
         # and 'hand_optimized_type_constraint' from the parent
         delete $args{compiled_type_constraint};
         delete $args{hand_optimized_type_constraint};
+        if(defined(my $parent_tp = $args{parent}{type_parameter})) {
+            delete $args{type_parameter} if $parent_tp == $args{type_parameter};
+        }
     }
 
     my $check;
@@ -72,6 +74,11 @@ sub compile_type_constraint;
 sub _add_type_coercions { # ($self, @pairs)
     my $self = shift;
 
+    if(exists $self->{type_constraints}){ # union type
+        $self->throw_error(
+            "Cannot add additional type coercions to Union types '$self'");
+    }
+
     my $coercions = ($self->{coercion_map} ||= []);
     my %has       = map{ $_->[0] => undef } @{$coercions};
 
@@ -90,14 +97,7 @@ sub _add_type_coercions { # ($self, @pairs)
         push @{$coercions}, [ $type => $action ];
     }
 
-    # compile
-    if(exists $self->{type_constraints}){ # union type
-        $self->throw_error(
-            "Cannot add additional type coercions to Union types");
-    }
-    else{
-        $self->_compile_type_coercion();
-    }
+    $self->_compile_type_coercion();
     return;
 }
 
@@ -144,14 +144,10 @@ sub _compile_union_type_coercion {
 
 sub coerce {
     my $self = shift;
-
-    my $coercion = $self->_compiled_type_coercion;
-    if(!$coercion){
-        $self->throw_error("Cannot coerce without a type coercion");
-    }
-
     return $_[0] if $self->check(@_);
 
+    my $coercion = $self->{_compiled_type_coercion}
+        or $self->throw_error("Cannot coerce without a type coercion");
     return  $coercion->(@_);
 }
 
@@ -172,7 +168,7 @@ sub get_message {
     }
 }
 
-sub is_a_type_of{
+sub is_a_type_of {
     my($self, $other) = @_;
 
     # ->is_a_type_of('__ANON__') is always false
@@ -196,7 +192,7 @@ sub is_a_type_of{
 }
 
 # See also Moose::Meta::TypeConstraint::Parameterizable
-sub parameterize{
+sub parameterize {
     my($self, $param, $name) = @_;
 
     if(!ref $param){
@@ -222,7 +218,7 @@ sub assert_valid {
 }
 
 sub _as_string { $_[0]->name                  } # overload ""
-sub _identity  { Scalar::Util::refaddr($_[0]) } # overload 0+
+sub _identity;                                  # overload 0+
 
 sub _unite { # overload infix:<|>
     my($lhs, $rhs) = @_;
@@ -241,7 +237,7 @@ Mouse::Meta::TypeConstraint - The Mouse Type Constraint metaclass
 
 =head1 VERSION
 
-This document describes Mouse version 0.71
+This document describes Mouse version 0.78
 
 =head1 DESCRIPTION