some simple cpp example for self memories and notes

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1. observer.cpp

is a observer design pattern

2. function_pointer.cpp

is base on your input to choose add or del function between number 3 and 4

3. fun_ptr_wiki.c

is a wiki sample do the same thing with function_pointer.cpp

4. md5

is a simple code implement Qt library

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XCODE PROJECT

1.registerCallback

this project is for 3rd party need provide a function pointer to customer side