Benjamin Kietzman created ARROW-4146:
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Summary: [C++] Extend visitor functions to include ArrayBuilder
and allow callable visitors
Key: ARROW-4146
URL: https://issues.apache.org/jira/browse/ARROW-4146
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Benjamin Kietzman
In addition to accepting objects with Visit methods for the visited type,
{{Visit(Array|Type)}} and {{Visit(Array|Type)Inline}} should accept objects
with overloaded call operators.
In addition for inline visitation if a visitor can only visit one of the
potential unboxings then this can be detected at compile time and the full
type_id switch can be avoided (if the unboxed object cannot be visited then do
nothing). For example:
{code}
VisitTypeInline(some_type, [](const StructType& s) {
// only execute this if some_type.id() == Type::STRUCT
});
{code}
Finally, visit functions should be added for visiting ArrayBuilders
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