GdaParameter
Represents a #GdaValue with various attributes
A #GdaParameter object basically is a specification for a value and can convey a value once one has been
set.
The #GdaParameter object offers other features such as:
keeping a list of objects which "are interested" (mentioned as "users" in the API)
in the value placed in the parameter:
this feature is usefull when parameters are created by objects and when these objects want to
be reminded that the parameter has been created by them at a later time
aliasing (binding) to another parameter: this is an easy way to keep several parameters
synchronized. There are two modes: one where parameters A and B will always have the same value
and where parameter B will update itself whan A changes to mirror tha change but will be
allowed to have its own changes afterwards.
values restrictions: a parameter can be told to choose a value among the values in a
colmun in a #GdaDataModel (beware that this is a declarative feature only and that no policy is
enforced regarding values changes)
@gdaparameter: the object which received the signal.
@type:
@Returns:
@dict:
@orig:
@Returns:
@name:
@str:
@Returns:
@name:
@value:
@Returns:
@param:
@Returns:
@param:
@user:
@field:
@param:
@Returns:
@param:
@Returns:
@param:
@value:
@param:
@value:
@Returns:
@param:
@param:
@Returns:
@param:
@Returns:
@param:
@value:
@param:
@Returns:
@param:
@default_value_exists:
@param:
@not_null:
@param:
@Returns:
@param:
@model:
@col:
@error:
@Returns:
@param:
@model:
@col:
@Returns:
@param:
@replacements:
@param:
@bind_to:
@param:
@Returns: