Opera 公司的笔试题，薪水还不错哦，我块放弃了，觉得程序可读性太差了

代码在附件里面，题目可以看readme,

哪位高手能把程序里面的几个class分析下，我看的很郁闷，就做出了第3题

我把题目发一些吧，不过代码还是得从我附件中下载，
Opera Programming Test

For this test you are given responsibility of a couple of classes that
implement logical functions as given by a truth table.
The interface and implementation of these classes are found in files
logicalfunction.h and logicalfunction.cpp respectively. 
In addition, there is a small program that tests the basic usage of the
classes, and a file testcases.h intended for use in the last task.

However, as of now these classes have a number of shortcomings, and it is your
task to correct these. First, take a look through the code and make a
quick estimate of how much time you think you will spend on each of the tasks
given below. Then, as you do the programming, record how much time
you actually spend.

TASKS:

1) The class interfaces do not follow good object-oriented design principles,
   which make them bug-prone and hard to extend/subclass properly.

   Improve the object-oriented design of the classes.

2) The class interfaces are almost completely undocumented.

   Include proper interface documentation in the .h-file.

3) There seems to be a bug somewhere, as the test program seems to end with a
   SEGV.

   Find the bug, explain what is wrong, and make a working fix.

4) The class LogicalFunction only supports functions defined by a table.
   For some logical functions, especially with many inputs, the truth tables may
   be inconveniently large. As an example, a 10-input XOR would need 1024 rows,
   whereas you could implement it by a couple of lines of C++ code.

   Make modifications that makes it possible for the calling program to define
   the behaviour of a LogicalFunction by providing C++ code.

5) Using your modified classes, define LogicalProcessors that are able to
   inspect an 8x8 monochrome pixel grid, represented by 64 inputs, and report
   whether this grid has horizontal, vertical or rotational symmetry.

   Verify your LogicalProcessors by using the grids given in testcases.h as
   input

If you have questions, please contact hr-china@opera.com.

We hope that you have fun!