允许C ++抽象类使用Objective-C委托 [英] Allow a C++ abstract class to use an Objective-C delegate

问题描述

我有一个抽象类和他的具体类实现。
我想做的是在iOS应用程序（Objective-C）中公开具体的类，并使用协议将事件分派给ViewController。

这个想法是将符合adHoc协议的客观C代表添加到这个具体的类。
任何想法如何实现？

不幸的是，我读到Objective-C ++不能继承C ++类。

提前谢谢。

解决方案

一个客观的c ++类不能继承自c ++类，包含一个

  @interface DelegateObject：NSObject 
 {
} 
  - （id）init ; 
  - （void）do_something：（NSObject *）东西; 
 @end 
 
 struct cpp_thing 
 {
 //这可能是一个模板，如果你愿意，或者你可以拿一个副本
 //或其他你想要
 void do_something（NSObject * thing）{}; 
}; 
 
 @implementation DelegateObject 
 {
 std :: shared_ptr< cpp_thing> _cpp; 
 
 
  - （id）init 
 {
 if（self = [super init]）
 {
 _cpp = std :: make_shared< cpp_thing>（）; 
} 
 return self; 
} 
 
  - （void）do_something：（NSObject *）东西
 {
 _cpp-> do_something（thing）; 
} 
 
 @end 
  

I have an abstract class and his concrete class implementation. What I would like to do is to expose the concrete class inside an iOS application (Objective-C) and use protocols to dispatch the events to a ViewController.

The idea is to add an objective C delegate, that conforms an adHoc protocol, to this concrete Class. Any Idea how to achieve it?

Unfortunately I read that Objective-C++ cannot inherits from a C++ class.

Thank you in advance.

解决方案

an objective c++ class can't inherit from a c++ class but it can contain one

@interface DelegateObject : NSObject
{
}
- (id) init;
- (void) do_something: (NSObject*) thing;
@end

struct cpp_thing
{
    // this could be a template if you wished, or you could take a copy
    // or whatever you want
    void do_something(NSObject* thing) { };
};

@implementation DelegateObject
{
    std::shared_ptr<cpp_thing> _cpp;
}

- (id) init
{
    if (self = [super init])
    {
        _cpp = std::make_shared<cpp_thing>();
    }
    return self;
}

- (void) do_something: (NSObject*) thing
{
    _cpp->do_something(thing);
}

@end

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