TAILIEUCHUNG - HandBooks Professional Java-C-Scrip-SQL part 100

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 100', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | include iostream include boost class slot public void operator const std cout Something important just happened n int main boost signal void sig boost signals scoped_connection s slot sig The boost signals scoped_connection s is given a small scope inside of main and after leaving that scope the signal sig is invoked. There is no output from that because the scoped_connection has already terminated the connection between the slot and the signal. Using scoped resources like this simplifies the code and maintenance thereof. Creating Slots Using Bind and Lambda You ve seen how useful and flexible Signals is. However you ll find even more power when you combine with and . Those two libraries covered in detail in Library 9 Bind 9 and Library 10 Lambda 10 help to create function objects on-the-fly. That means it is possible to create slots and slot types right at the point where they are connected to a signal rather than having to write a special single-purpose class for a slot create an instance and then connect it. It also puts the slot logic right where it s used rather than in a separate part of the source code. Finally these libraries even make it possible to adapt existing classes that don t provide a function call operator but have other suitable means for handling signals. In the first example to follow we ll have a look at how neatly lambda expressions can be used to create a few slot types. The slots will be created right in the call to connect. The first one simply prints a message to std cout when the slot is invoked. The second checks the value of the string passed through the signal to the slot. If it equals Signal it prints one message otherwise it prints another message. These examples are rather contrived but the expressions could perform any kind of useful computation. The last two slots created in the example will do exactly what double_slot and plus_slot did in an example earlier in the .

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