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added ExtensionClass<...>::declare_base(...) which

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- declares a wrapped C++ class to be a base class of another wrapped class
  - enables conversions between those classes
  - ensures that base class methods are inherited by the subclass


[SVN r7971]
This commit is contained in:
Ullrich Köthe
2000-10-17 14:50:07 +00:00
parent f6f8a3d5d0
commit 26bf57c4e9
6 changed files with 323 additions and 27 deletions
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37
extclass.cpp
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@@ -157,7 +157,7 @@ void report_missing_instance_data(
}
else
{
two_string_error(PyExc_TypeError, "extension class '%.*s' is not derived from '%.*s'.",
two_string_error(PyExc_TypeError, "extension class '%.*s' is not convertible into '%.*s'.",
instance->ob_type->tp_name, target_class->tp_name);
}
}
@@ -218,6 +218,41 @@ ExtensionClassBase::ExtensionClassBase(const char* name)
{
}
void * ExtensionClassBase::try_class_conversions(InstanceHolderBase * object) const
{
void * result = try_sub_class_conversions(object);
if(result) return result;
result = try_super_class_conversions(object);
return result;
}
void * ExtensionClassBase::try_super_class_conversions(InstanceHolderBase * object) const
{
void * result = 0;
for(int i=0; i<base_classes().size(); ++i)
{
if(base_classes()[i].second == 0) continue;
result = base_classes()[i].first->convert_from_holder(object);
if(result) return (*base_classes()[i].second)(result);
result = base_classes()[i].first->try_super_class_conversions(object);
if(result) return (*base_classes()[i].second)(result);
}
return 0;
}
void * ExtensionClassBase::try_sub_class_conversions(InstanceHolderBase * object) const
{
void * result = 0;
for(int i=0; i<sub_classes().size(); ++i)
{
result = sub_classes()[i].first->convert_from_holder(object);
if(result) return (*sub_classes()[i].second)(result);
result = sub_classes()[i].first->try_sub_class_conversions(object);
if(result) return (*sub_classes()[i].second)(result);
}
return 0;
}
void ExtensionClassBase::add_method(Function* method, const char* name)
{
add_method(PyPtr<Function>(method), name);