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docs: fix decorator to reflect multiple decorators

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* docs/language/api.rst: the `with-decorator' builtin supports multiple
  decorators which it applies in order. Docs are updated to reflect this
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Abhishek L 2014-05-23 23:03:38 +05:30
parent 0f0c4227b6
commit 1da6d0af43
1 changed files with 35 additions and 10 deletions
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docs/language/api.rst
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@ -1293,23 +1293,48 @@ file is automatically closed after it has been processed.
with-decorator
--------------
`with-decorator` is used to wrap a function with another. The function performing
decoration should accept a single value, the function being decorated and return
a new function. `with-decorator` takes two parameters, the function performing
decoration and the function being decorated.
`with-decorator` is used to wrap a function with another. The function
performing decoration should accept a single value, the function being
decorated and return a new function. `with-decorator` takes a minimum
of two parameters, the function performing decoration and the function
being decorated. More than one decorator function can be applied, they
will be applied in order from outermost to innermost, ie. the first
decorator will be the outermost one & so on. Decorators with arguments
are called just like a function call.
In the following example, `inc-decorator` is used to decorate function `addition`
with a function that takes two parameters and calls the decorated function with
values that are incremented by 1. When decorated `addition` is called with values
1 and 1, the end result will be 4 (1+1 + 1+1).
.. code-block:: clj
(with-decorator decorator-fun
(defn some-function [] ...)
(with-decorator decorator1 decorator2 ...
(defn some-function [] ...)
(with-decorator (decorator arg) ..
(defn some-function [] ...)
In the following example, `inc-decorator` is used to decorate function
`addition` with a function that takes two parameters and calls the
decorated function with values that are incremented by 1. When
decorated `addition` is called with values 1 and 1, the end result
will be 4 (1+1 + 1+1).
.. code-block:: clj
=> (defn inc-decorator [func]
... (fn [value-1 value-2] (func (+ value-1 1) (+ value-2 1))))
=> (defn inc2-decorator [func]
... (fn [value-1 value-2] (func (+ value-1 2) (+ value-2 2))))
=> (with-decorator inc-decorator (defn addition [a b] (+ a b)))
=> (addition 1 1)
4
=> (with-decorator inc2-decorator inc-decorator
... (defn addition [a b] (+ a b)))
=> (addition 1 1)
8
.. _with-gensyms: