C++ 如何将参数传递给 boost::thread？
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How to pass an argument to boost::thread?
提问by Guillaume07
thread_ = boost::thread( boost::function< void (void)>( boost::bind( &clientTCP::run , this ) ) );
is it possible that run has an argument like this :
run 是否有可能有这样的参数：
void clientTCP::run(boost:function<void(std::string)> func);
and if yes how my boost::thread call should be written
如果是，我的 boost::thread 调用应该如何编写
Thanks.
谢谢。
回答by Mark Ingram
The following code boost::bind( &clientTCP::run , this )defines a function callback. It calls the function runon the current instance (this). With boost::bind you can do the following:
以下代码boost::bind( &clientTCP::run , this )定义了一个函数回调。它调用run当前实例 ( this)上的函数。使用 boost::bind 您可以执行以下操作：
// Pass pMyParameter through to the run() function
boost::bind(&clientTCP::run, this, pMyParameter)
See the documentation and example here:
http://www.boost.org/doc/libs/1_46_1/doc/html/thread/thread_management.html
请参阅此处的文档和示例：http:
//www.boost.org/doc/libs/1_46_1/doc/html/thread/thread_management.html
If you wish to construct an instance of boost::thread with a function or callable object that requires arguments to be supplied, this can be done by passing additional arguments to the boost::thread constructor:
如果您希望使用需要提供参数的函数或可调用对象来构造 boost::thread 的实例，可以通过将附加参数传递给 boost::thread 构造函数来完成：
void find_the_question(int the_answer);
boost::thread deep_thought_2(find_the_question,42);
Hope that helps.
希望有帮助。
回答by Adri C.S.
I just wanted to note, for future work, that Boost by default passes the arguments by value. So if you want to pass a reference you have the boost::ref()and boost::cref()methods, the latter for constant references.
我只是想指出，为了将来的工作，Boost 默认按值传递参数。所以如果你想传递一个引用，你有boost::ref()和boost::cref()方法，后者用于常量引用。
I think you can still use the &operator for referencing, but I'm not sure, I have always used boost::ref.
我认为您仍然可以使用&运算符进行引用，但我不确定，我一直使用boost::ref.
回答by Jonathan Wakely
thread_ = boost::thread( boost::function< void (void)>( boost::bind( &clientTCP::run , this ) ) );
The bindandthe functionare unnecessary, and make the code slower and use more memory. Just do:
的bind和的function是不必要的，并且使代码更慢，使用更多的存储器。做就是了：
thread_ = boost::thread( &clientTCP::run , this );
To add an argument just add an argument:
要添加参数，只需添加一个参数：
thread_ = boost::thread( &clientTCP::run , this, f );
