9.25  snip-class%

Useful snip classes are defined by instantiating derived subclasses of snip-class%. A class derived from snip-class% serves as a kind of ``meta-class'' for snips; each snip is associated with an instance of snip-class% as its snip class.

In deriving a new snip-class% class, override the read method. Then, for each instance of the derived class (where each instance corresponds to a single snip class):

• Set the classname using set-classname.

• Set the version using set-version.

• Install the class into the list returned by get-the-snip-class-list using the add method. Note that if the same name is inserted into the same class list multiple times, all but the first insertion is ignored.

See also Snip Classes.

• (make-object snip-class%) -> snip-class% object

  Creates a useless snip class.

  
  

Methods
    get-classname
    get-version
    read
    read-header
    reading-version
    set-classname
    set-version
    write-header