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Within LTS Haskell 24.52 (ghc-9.10.3)
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foldMapDefault :: (Traversable t, Monoid m) => (a -> m) -> t a -> mghc-internal GHC.Internal.Data.Traversable This function may be used as a value for foldMap in a Foldable instance.
foldMapDefault f ≡ getConst . traverse (Const . f)
concatMap :: (a -> [b]) -> [a] -> [b]ghc-internal GHC.Internal.List Map a function returning a list over a list and concatenate the results. concatMap can be seen as the composition of concat and map.
concatMap f xs == (concat . map f) xs
Examples
>>> concatMap (\i -> [-i,i]) [] []
>>> concatMap (\i -> [-i, i]) [1, 2, 3] [-1,1,-2,2,-3,3]
>>> concatMap ('replicate' 3) [0, 2, 4] [0,0,0,2,2,2,4,4,4]contextGetFontMap :: (HasCallStack, MonadIO m, IsContext a) => a -> m (Maybe FontMap)gi-pango GI.Pango.Objects.Context Gets the PangoFontMap used to look up fonts for this context. Since: 1.6
contextSetFontMap :: (HasCallStack, MonadIO m, IsContext a, IsFontMap b) => a -> Maybe b -> m ()gi-pango GI.Pango.Objects.Context Sets the font map to be searched when fonts are looked-up in this context. This is only for internal use by Pango backends, a PangoContext obtained via one of the recommended methods should already have a suitable font map.
fontGetFontMap :: (HasCallStack, MonadIO m, IsFont a) => Maybe a -> m (Maybe FontMap)gi-pango GI.Pango.Objects.Font Gets the font map for which the font was created. Note that the font maintains a *weak* reference to the font map, so if all references to font map are dropped, the font map will be finalized even if there are fonts created with the font map that are still alive. In that case this function will return Nothing. It is the responsibility of the user to ensure that the font map is kept alive. In most uses this is not an issue as a PangoContext holds a reference to the font map. Since: 1.10
module GI.Pango.Objects.
FontMap A PangoFontMap represents the set of fonts available for a particular rendering system. This is a virtual object with implementations being specific to particular rendering systems.
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gi-pango GI.Pango.Objects.FontMap Memory-managed wrapper type.
FontMap :: ManagedPtr FontMap -> FontMapgi-pango GI.Pango.Objects.FontMap No documentation available.
class (GObject o, IsDescendantOf FontMap o) =>
IsFontMap ogi-pango GI.Pango.Objects.FontMap Type class for types which can be safely cast to FontMap, for instance with toFontMap.
fontMapChanged :: (HasCallStack, MonadIO m, IsFontMap a) => a -> m ()gi-pango GI.Pango.Objects.FontMap Forces a change in the context, which will cause any PangoContext using this fontmap to change. This function is only useful when implementing a new backend for Pango, something applications won't do. Backends should call this function if they have attached extra data to the context and such data is changed. Since: 1.34