set_value_default
  
  Description:
  [ 
CCode ( cname = 
"g_param_value_set_default" ) ]
public void set_value_default (
ref Value value)
  
    Sets value to its default value as specified in pspec.
    Parameters:
    
      
        | value | a Value of correct type for pspec; since 2.64, you  can also pass 
            an empty Value, initialized with g_value_init | 
      
        | pspec | a valid ParamSpec |