TAILIEUCHUNG - HandBooks Professional Java-C-Scrip-SQL part 96

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 96', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Usage When faced with needing more than one piece of code in a program to handle a given event typical solutions involve callbacks through function pointers or directly coded dependencies between the subsystem that fires the event and the subsystems that need to handle it. Circular dependencies are a common result of such designs. Using you gain flexibility and decoupling. To start using the library include the header boost . 2 The following example demonstrates the basic properties of signals and slots including how to connect them and how to emit the signal. Note that a slot is something that you provide either a function or a function object that is compatible with the function signature of the signal. In the following code we create both a free function my_first_slot and a function object my_second_slot both are then connected to the signal that we create. include iostream include boost void my_first_slot std cout void my_first_slot n class my_second_slot public void operator const std cout void my_second_slot operator const n int main boost signal void sig my_first_slot my_second_slot std cout Emitting a signal. n sig We start by declaring a signal which expects slots that return void and take no arguments. We then connect two compatible slot types to that signal. For one we call connect with the address of the free function my_first_slot. For the other we default-construct an instance of the function object my_second_slot and pass it to connect. These connections mean that when we emit a signal by invoking sig the two slots will be called immediately. sig When running the program the output will look something like this Emitting a signal. void my_first_slot void my_second_slot operator const However the order of the last two lines is unspecified because slots belonging to the same group are invoked in an unspecified order. There is no way of telling which of our slots will be called first. Whenever

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