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xml_node: change with_sub_node signature

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The `with_sub_node` method is renamed to `with_optional_sub_node` to
better reflect that the non-existence of a sub node with the desired type is
ignored.
At the same time, the new `with_sub_node` now takes a second functor that is
called when no sub node of the desired type exists.

genodelabs/genode#4600
This commit is contained in:
Johannes Schlatow
2022-09-08 10:17:26 +02:00
committed by Norman Feske
parent f0e9881c7e
commit 7d143087c9
47 changed files with 220 additions and 205 deletions
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17
repos/base/include/util/xml_node.h
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@ -846,12 +846,27 @@ class Genode::Xml_node
* If no matching sub node exists, the functor is not called.
*/
template <typename FN>
void with_sub_node(char const *type, FN const &fn) const
void with_optional_sub_node(char const *type, FN const &fn) const
{
if (has_sub_node(type))
fn(sub_node(type));
}
/**
* Apply functor 'fn' to first sub node of specified type
*
* The functor is called with the sub node as argument.
* If no matching sub node exists, the functor 'fn_nexists' is called.
*/
template <typename FN, typename FN_NEXISTS>
void with_sub_node(char const *type, FN const &fn, FN_NEXISTS const &fn_nexists) const
{
if (has_sub_node(type))
fn(sub_node(type));
else
fn_nexists();
}
/**
* Execute functor 'fn' for each sub node of specified type
*/