[Docs][C++] The DataTypesAPI documentation is missing documentation for some classes and methods #46808

Describe the enhancement requested

https://arrow.apache.org/docs/cpp/api/datatype.html

IIUC, Unchecked classes do not have API Docs.

I wanted know how to get list_size in FixedSizeListType class and traversed to parent class.
Finally, I couldn't find it. Additionally, I found some class don't have API documentation.
@kou told me the method defined in the FixedSizeListType class.
#46774 (comment)
The method doesn't have API documentation.

I think it's useful to add comments to methods that don't have API documentation.

Should these classes be listed in the API Doc?

I picked up these classes from type.h

• BaseBinaryType
• BaseListType
• BinaryType
• BinaryViewType
• BooleanType
• DataType
• Date32Type
• Date64Type
• DateType
• DayTimeIntervalType
• DecimalType
• Decimal32Type
• Decimal64Type
• Decimal128Type
• Decimal256Type
• DenseUnionType
• DictionaryType
• DoubleType
• DurationType
• Field
• FieldPath
• FieldRef
• Fingerprintable (No DataType class)
• FixedSizeBinaryType
• FixedSizeListType
• FixedWidthType
• FloatingPointType
• FloatType
• HalfFloatType
• Int8Type
• Int16Type
• Int32Type
• Int64Type
• IntegerType
• IntervalType
• LargeBinaryType
• LargeListType
• LargeListViewType
• LargeStringType
• ListType
• ListViewType
• MapType
• MonthDayNanoIntervalType
• MonthIntervalType
• NestedType
• NullType
• NumberType
• PrimitiveCType
• RunEndEncodedType
• SparseUnionType
• StringType
• StringViewType
• StructType
• TemporalType
• Time32Type
• Time64Type
• TimestampType
• TimeType
• UInt8Type
• UInt16Type
• UInt32Type
• UInt64Type
• UnionType

Component(s)

Documentation