value_convert
Description:
[ CCode ( cname = "g_param_value_convert" ) ]
public bool value_convert (Value src_value, ref Value dest_value, bool strict_validation)
  public bool value_convert (Value src_value, ref Value dest_value, bool strict_validation)
Transforms src_value into dest_value if possible, and then validates dest_value, in order for it to 
      conform to pspec.
 If strict_validation is true this function will only succeed if the transformed 
        dest_value complied to pspec without modifications.
See also type_transformable, transform and value_validate.
Parameters:
| src_value | source Value | 
| dest_value | destination Value of correct type for  | 
| strict_validation | true requires  | 
| pspec | a valid ParamSpec | 
Returns:
| true if transformation and validation were successful,  false 
            otherwise and  |