g-param-value-validate (pspec value)

pspec -- a valid g-param-spec structure
value -- a g-value of correct type for pspec

A boolean whether modifying value was necessary to ensure validity.

Ensures that the contents of value comply with the specifications set out by pspec.

For example, a g-param-spec-int might require that integers stored in value may not be smaller than -42 and not be greater than +42. If value contains an integer outside of this range, it is modified accordingly, so the resulting value will fit into the range -42 .. +42.