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libcamera: value_node: Add mutable adapters

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The ValueNode class was initially designed to store read-only property
trees. It is useful to also provide mutable access. Add non-const
adapters and iterators and adapters. This allows obtaining a mutable
ValueNode instance when traversing a tree.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
Reviewed-by: Isaac Scott <isaac.scott@ideasonboard.com>
This commit is contained in:
Laurent Pinchart
2025-10-17 21:53:34 +03:00
parent 49aa81b9ec
commit b25556c691
2 changed files with 34 additions and 8 deletions
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32
include/libcamera/internal/value_node.h
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@@ -143,17 +143,31 @@ public:
}
};
class DictAdapter : public Adapter<DictIterator<const ValueNode,
ValueContainer::const_iterator>,
const ValueContainer>
class DictAdapter : public Adapter<DictIterator<ValueNode,
ValueContainer::iterator>,
ValueContainer>
{
public:
using key_type = std::string;
};
class ListAdapter : public Adapter<ListIterator<const ValueNode,
ValueContainer::const_iterator>,
const ValueContainer>
class ListAdapter : public Adapter<ListIterator<ValueNode,
ValueContainer::iterator>,
ValueContainer>
{
};
class ConstDictAdapter : public Adapter<DictIterator<const ValueNode,
ValueContainer::const_iterator>,
const ValueContainer>
{
public:
using key_type = std::string;
};
class ConstListAdapter : public Adapter<ListIterator<const ValueNode,
ValueContainer::const_iterator>,
const ValueContainer>
{
};
#endif /* __DOXYGEN__ */
@@ -211,8 +225,10 @@ public:
.set(*this, std::forward<T>(value));
}
DictAdapter asDict() const { return DictAdapter{ list_ }; }
ListAdapter asList() const { return ListAdapter{ list_ }; }
DictAdapter asDict() { return DictAdapter{ list_ }; }
ListAdapter asList() { return ListAdapter{ list_ }; }
ConstDictAdapter asDict() const { return ConstDictAdapter{ list_ }; }
ConstListAdapter asList() const { return ConstListAdapter{ list_ }; }
const ValueNode &operator[](std::size_t index) const;

10
src/libcamera/value_node.cpp
View File

@@ -337,6 +337,11 @@ template struct ValueNode::Accessor<std::vector<uint32_t>>;
template struct ValueNode::Accessor<std::vector<std::string>>;
#endif /* __DOXYGEN__ */
/**
* \fn ValueNode::asDict()
* \copydoc ValueNode::asDict() const
*/
/**
* \fn ValueNode::asDict() const
* \brief Wrap a dictionary ValueNode in an adapter that exposes iterators
@@ -357,6 +362,11 @@ template struct ValueNode::Accessor<std::vector<std::string>>;
* \return An adapter of unspecified type compatible with range-based for loops
*/
/**
* \fn ValueNode::asList()
* \copydoc ValueNode::asList() const
*/
/**
* \fn ValueNode::asList() const
* \brief Wrap a list ValueNode in an adapter that exposes iterators