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      1 # Copyright (c) 2014-2015, Intel Corporation
      2 # All rights reserved.
      3 #
      4 # Redistribution and use in source and binary forms, with or without modification,
      5 # are permitted provided that the following conditions are met:
      6 #
      7 # 1. Redistributions of source code must retain the above copyright notice, this
      8 # list of conditions and the following disclaimer.
      9 #
     10 # 2. Redistributions in binary form must reproduce the above copyright notice,
     11 # this list of conditions and the following disclaimer in the documentation and/or
     12 # other materials provided with the distribution.
     13 #
     14 # 3. Neither the name of the copyright holder nor the names of its contributors
     15 # may be used to endorse or promote products derived from this software without
     16 # specific prior written permission.
     17 #
     18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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     20 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     21 # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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     23 # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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     26 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     27 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28 
     29 
     30 class DynamicCallHelper:
     31 
     32     """
     33         Callable object which wrap a function call.
     34 
     35         This simple class is designed to avoid the use of lambda
     36         hack to capture arguments when generating function call.
     37         Indeed, to generate a call to a function which take
     38         parameters at runtime, we need to force the copy by capture
     39         of the parameter by using default value such as :
     40 
     41             callerDict = {
     42                 a: lambda a=a : print(a)
     43                 for a in range(5)
     44                 }
     45 
     46         With the DynamicCallHelper you can simply use :
     47 
     48             callerDict = {
     49                 DynamicCallHelper(print, a)
     50                 for a in range(5)
     51                 }
     52     """
     53 
     54     def __init__(self, func, *args):
     55         """
     56             Init method
     57 
     58             :param func: the function that will be called when calling the object
     59             :type func: function
     60             :param *args: arguments destinated to func
     61             :type *args: list
     62         """
     63 
     64         self.__func = func
     65         self.__args = args
     66 
     67     def __call__(self):
     68         """
     69             Call the function __func with __args as arguments
     70 
     71             :return: __func return
     72         """
     73 
     74         return self.__func(*self.__args)
     75