Graphics.QML.DataModel.Internal.Generic.Get

Indexing data types by columns.

Documentation

class QtTable t where

A class of types with columns that can be indexed by an integer. A generic implementation is provided for all single constructor types.

Minimal complete definition

Nothing

Methods

getColumn :: Int -> t -> IO QtVariant

class GQtTable f where

A generic implementation of QtTable.

Methods

gGetColumn :: Int -> f a -> IO QtVariant

Instances

QtField t => GQtTable * (K1 i t)

If only one value is available, it's returned regardless of the index.

(GCountFields (* -> *) a, GCountFields (* -> *) b, GQtTable * a, GQtTable * b) => GQtTable * ((:*:) a b)

One branch of a product type is chosen depending on the index.

GQtTable * f => GQtTable * (M1 i t f)

Meta information is skipped, and the recursion proceeds further down.

class QtField t where

A class of types with columns that can be cast to a QtVariant.

Methods

qtField :: t -> IO QtVariant

Instances

QtField Bool

QtField Double

QtField Int

QtField Integer

Integers are marshalled through QT strings rather than ints.

QtField String

QtField Natural

Naturals are marshalled through QT strings rather than ints.

QtField Text

QtField t => QtField (Maybe t)

Nothing is marshalled as QT null.