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util/list_model.h: Add update_list_model_from_xml

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The new 'update_list_model_from_xml' function template simplifies the
use of the list model utility by alleviating the need for implementing a
custom policy class for each model. Instead, the transformation is done
using a few lambda functions given directly as arguments.

Issue #4317
This commit is contained in:
Norman Feske 2021-11-05 15:24:15 +01:00 committed by Christian Helmuth
parent 449f647e58
commit 4df7e6adde
1 changed files with 54 additions and 1 deletions
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55
repos/base/include/util/list_model.h
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@ -24,7 +24,18 @@
#include <util/list.h>
#include <base/log.h>
namespace Genode { template <typename> class List_model; }
namespace Genode {
template <typename> class List_model;
template <typename CREATE_FN, typename DESTROY_FN, typename UPDATE_FN,
typename NODE = decltype(CREATE_FN())>
static inline void update_list_model_from_xml(List_model<NODE> &,
Xml_node const &,
CREATE_FN const &,
DESTROY_FN const &,
UPDATE_FN const &);
}
template <typename ELEM>
@ -245,4 +256,46 @@ struct Genode::List_model<ELEM>::Update_policy
static bool node_is_element(Xml_node) { return true; }
};
template <typename CREATE_FN, typename DESTROY_FN, typename UPDATE_FN, typename NODE>
void Genode::update_list_model_from_xml(List_model<NODE> &model,
Xml_node const &xml,
CREATE_FN const &create,
DESTROY_FN const &destroy,
UPDATE_FN const &update)
{
struct Model_update_policy : List_model<NODE>::Update_policy
{
CREATE_FN const &_create_fn;
DESTROY_FN const &_destroy_fn;
UPDATE_FN const &_update_fn;
Model_update_policy(CREATE_FN const &create_fn,
DESTROY_FN const &destroy_fn,
UPDATE_FN const &update_fn)
:
_create_fn(create_fn), _destroy_fn(destroy_fn), _update_fn(update_fn)
{ }
void destroy_element(NODE &node) { _destroy_fn(node); }
NODE &create_element(Xml_node xml) { return _create_fn(xml); }
void update_element(NODE &node, Xml_node xml) { _update_fn(node, xml); }
static bool element_matches_xml_node(NODE const &node, Xml_node xml)
{
return node.matches(xml);
}
static bool node_is_element(Xml_node node)
{
return NODE::type_matches(node);
}
} policy(create, destroy, update);
model.update_from_xml(policy, xml);
}
#endif /* _INCLUDE__UTIL__LIST_MODEL_H_ */