iOS将Boost类声明为类变量

Question

I am trying to use boost library class to do some socket communication. I need to do declare this variables as class instance, so I have declared like below,

@interface Custom_View : UIView{
    boost::asio::io_service io_service_2;
    tcp::resolver r_2(io_service_2);
    client c_2(io_service_2);
    boost::thread* dvr_thread_2;
}

Getting erro like

Custom_View.h:46:23: Unknown type name 'io_service_2'; did you mean 'boost::asio::io_service'?
Custom_View.h:47:16: Unknown type name 'io_service_2'; did you mean 'boost::asio::io_service'?
Custom_View.h:46:19: Field 'r_2' declared as a function
Custom_View.h:47:12: Field 'c_2' declared as a function

How can I resolve this error.

Answer 1

If you're trying to declare an Objective-C class or static variable, you must do it outside of the curly brackets in the @interface declaration. For example (it's okay to ommit the '{}' if you're not declaring any instance variables):

@interface SubclassName : SuperclassName

Type variableName;

That being said, I'm not familiar with the boost library, and the variables declared in your code do not appear to be valid Objective-C. A quick Google search brought up this GitHub project which may help lead you in the right direction: https://github.com/mz2/boostoniphone