1.129 class quote_function

A quote_function object may be used to avoid evaluation of a function object, notably to pass function objects over methods that would cause the function to be evaluated. Two mechanisms make quote_function objects almost transparent to functions objects:

• Class quote_function delegates to its quote_function<-function.
• function<-convert translates a quote_function into the quote_function<-function.

  In the following example, Chain is a chain of chains. The task is to sort the elements of the sub-chains by name.

  send(Chain, for_all,
           message(@arg1, sort,
                           quote_function(?(@arg1?name, compare,
                                                            @arg2?name))))
  

  Without the quote_function, the function will be evaluated by the message object, while evaluation by chain->sort is the intended behaviour.

1.129.1 Instance variables

quote_function <-> function: function

The function object quoted. Methods are delegated to this object.

1.129.2 Send methods

quote_function ->initialise: function=function

Create a quote_function from the function quoted.