alias Gio::SettingsGetMapping
Overview
The type of the function that is used to convert from a value stored in a #GSettings to a value that is useful to the application.
If the value is successfully mapped, the result should be stored at
@result and true returned. If mapping fails (for example, if @value
is not in the right format) then false should be returned.
If @value is nil then it means that the mapping function is being
given a "last chance" to successfully return a valid value. true
must be returned in this case.
Alias Definition
GLib::Variant, Pointer(Void)? -> Bool