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S.l.e!ep.�K? — Wed, 05 Nov 2014 12:51:00 GMT

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S.l.e!ep.�K? 2014-11-05 20:51 发表评论

S.l.e!ep.�K? — Wed, 05 Nov 2014 02:45:00 GMT

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S.l.e!ep.�K? 2014-11-05 10:45 发表评论

2014.04.18.Coroutines 的坑

S.l.e!ep.�K? — Thu, 17 Apr 2014 08:21:00 GMT

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S.l.e!ep.�K? 2014-04-17 16:21 发表评论

Fiber

S.l.e!ep.�K? — Sun, 19 May 2013 11:56:00 GMT

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S.l.e!ep.�K? 2013-05-19 19:56 发表评论

S.l.e!ep.�K? — Sun, 19 May 2013 08:54:00 GMT

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S.l.e!ep.�K? 2013-05-19 16:54 发表评论

Coroutines in C

S.l.e!ep.�K? — Sun, 19 May 2013 08:07:00 GMT

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S.l.e!ep.�K? 2013-05-19 16:07 发表评论

Protothreads

S.l.e!ep.�K? — Sun, 19 May 2013 07:12:00 GMT

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S.l.e!ep.�K? 2013-05-19 15:12 发表评论

pass variable-argument list

S.l.e!ep.�K? — Sat, 18 May 2013 02:45:00 GMT

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S.l.e!ep.�K? 2013-05-18 10:45 发表评论

S.l.e!ep.�K? — Tue, 14 May 2013 01:46:00 GMT

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S.l.e!ep.�K? 2013-05-14 09:46 发表评论

vector �?find_if

S.l.e!ep.�K? — Sun, 15 Jul 2012 10:14:00 GMT

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S.l.e!ep.�K? 2012-07-15 18:14 发表评论

Heap corruption detected.

S.l.e!ep.�K? — Tue, 20 Mar 2012 19:06:00 GMT

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S.l.e!ep.�K? 2012-03-21 03:06 发表评论

S.l.e!ep.�K? — Sun, 26 Feb 2012 08:40:00 GMT

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S.l.e!ep.�K? 2012-02-26 16:40 发表评论

S.l.e!ep.�K? — Fri, 17 Feb 2012 06:29:00 GMT

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S.l.e!ep.�K? 2012-02-17 14:29 发表评论

排序比较函数�Q?lt;�W�号你重载对么了么？

S.l.e!ep.�K? — Sat, 15 Oct 2011 00:00:00 GMT

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S.l.e!ep.�K? 2011-10-15 08:00 发表评论

S.l.e!ep.�K? — Fri, 14 Oct 2011 23:50:00 GMT

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S.l.e!ep.�K? 2011-10-15 07:50 发表评论

tuple�q�化

S.l.e!ep.�K? — Mon, 06 Jun 2011 05:08:00 GMT

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S.l.e!ep.�K? 2011-06-06 13:08 发表评论

S.l.e!ep.�K? — Sun, 08 May 2011 22:47:00 GMT

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S.l.e!ep.�K? 2011-05-09 06:47 发表评论

如何合�ƈ两个vector?

S.l.e!ep.�K? — Tue, 26 Apr 2011 18:54:00 GMT

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S.l.e!ep.�K? 2011-04-27 02:54 发表评论

STL—vector删除重复元素

S.l.e!ep.�K? — Tue, 26 Apr 2011 18:53:00 GMT

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S.l.e!ep.�K? 2011-04-27 02:53 发表评论

CURL

S.l.e!ep.�K? — Wed, 20 Apr 2011 03:42:00 GMT

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S.l.e!ep.�K? 2011-04-20 11:42 发表评论

S.l.e!ep.�K? — Thu, 07 Apr 2011 18:06:00 GMT

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S.l.e!ep.�K? 2011-04-08 02:06 发表评论

C++中的通用Closure

S.l.e!ep.�K? — Tue, 05 Apr 2011 21:01:00 GMT

在这��文章里面，我介�l�一下如何自己实��C��个闭包，方便�q�行C++的类函数回调。该闭包能够接受��L��c�M��及类成员做参数�?br />

* 闭包概念
来源于大名鼎鼎的wikipedia:
In computer science, a closure is a function that is evaluated in an
environment containing one or more bound variables. When called, the function can access these variables.

��是说闭包绑定了一个函��C��及该函数调用发生需要的所有参数。当闭包被调用的时候，相当于函数被调用�Q�而且可以讉K��l�定的参数�?br />

* �W�一步，能接受�Q意类型的�c�d��?br />�q�是�W�一个实�?br />


template
class Closure {
  typedef void (T::Func)();
  public:
    Closure(T* obj, Func f):
      obj_(obj), f_(f) {
    }

    void Run() {
      (obj_::*f_)();
    }

 private:
   T *obj_;
   Func *f_;
};

使用��h��


class MyClass {
 public:
  void PrintName() { cout << "MyClass"; }
};

MyClass obj;
Closure closure(obj, &MyClass::PrintName);
closure.Run();

看�v来不错，是吧:-)
但是�q�不能绑定参数呢。。我们来解决�q�个问题�Q�让他能�l�定一个参数先�?br />

* �W�二步，能绑定一个�Q意类型参�?br />


template
class Closure {
  typedef void (T::Func)(Arg);
  public:
    Closure(T* obj, Func f, Arg a):
      obj_(obj), f_(f), a_(a) {
    }

    void Run() {
      (obj_::*f_)(a_);
    }

 private:
   T *obj_;
   Func *f_;
   Arg a_;
};

使用�Ҏ��


class MyClass {
 public:
  void PrintName(const string& name) { cout << name; }
};

MyClass obj;
Closure closure(obj, &MyClass::PrintName, "MyName");
closure.Run();

哈哈�Q�很好！现在可以�l�定参数�|�～�?br />那怎么可以�l�定两个参数呢？嘿嘿�Q�自己想吧～

现在�q�个使用�Ҏ��我觉得很隄��Q�既然调用方法都是统一的void
Run()�Q�我们应该可以让它��用�v来更��? 而且如果我要把两个不同的
closure传给某个函数��做不到�?br />比如:


class MyClass {
 public:
  void PrintName(const string& name) { cout << name; }
};

class MyClass_2 {
 public:
  void PrintValue(int val) { cout << val; }
}

// �q�个函数怎么写才能让两个不同的closure都可以传�q�来�Q?br />void func(???* closure) { closure->Run(); }

MyClass obj;
Closure closure1(obj, &MyClass::PrintName, "MyName");
MyClass_2 obj2;
Closure closure2(obj, &MyClass::PrintValue, 11);
closure.Run();

好吧�Q�干�z�d��!

* �W�三步，使用��h��更简单的Closure


// 基类;
class Closure {
  public:
    virtual void Run() = 0;
};

// 实现支持一个参数的Closure;
template
class OneArgClosure: public Closure {
  typedef void (T::Func)(Arg);
  public:
    Closure(T* obj, Func f, Arg a):
      obj_(obj), f_(f), a_(a) {
    }

    virtual void Run() {
      (obj_::*f_)(a_);
    }

 private:
   T *obj_;
   Func *f_;
   Arg a_;
};

// 辅助函数
Template
Closure* NewClosure((T* obj, Func f, Arg a) {
  return OneArgClosure(obj, f, a);
}

使用��h��单多�?br />


class MyClass {
 public:
  void PrintName(const string& name) { cout << name; }
};

MyClass obj;
Closure* closure = NewClosure(obj, &MyClass::PrintName, "MyName");
closure->Run();
delete closure;

S.l.e!ep.�K? 2011-04-06 05:01 发表评论

STL::string vs STLPort::string

S.l.e!ep.�K? — Fri, 01 Apr 2011 01:33:00 GMT

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S.l.e!ep.�K? 2011-04-01 09:33 发表评论

S.l.e!ep.�K? — Thu, 27 Jan 2011 02:30:00 GMT

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S.l.e!ep.�K? 2011-01-27 10:30 发表评论

S.l.e!ep.�K? — Wed, 05 Jan 2011 02:53:00 GMT

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S.l.e!ep.�K? 2011-01-05 10:53 发表评论

使用scanf需要注意的问题

S.l.e!ep.�K? — Fri, 31 Dec 2010 09:13:00 GMT

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S.l.e!ep.�K? 2010-12-31 17:13 发表评论

C++�Q�Type Casting

S.l.e!ep.�K? — Fri, 08 Oct 2010 06:08:00 GMT

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S.l.e!ep.�K? 2010-10-08 14:08 发表评论

std::tr1::shared_ptr 使用的一点体�?

S.l.e!ep.�K? — Fri, 03 Sep 2010 14:29:00 GMT

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S.l.e!ep.�K? 2010-09-03 22:29 发表评论

about C2632: 'int' followed by 'int' is illegal

S.l.e!ep.�K? — Fri, 03 Sep 2010 07:12:00 GMT

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S.l.e!ep.�K? 2010-09-03 15:12 发表评论

S.l.e!ep.�K? — Wed, 25 Aug 2010 10:36:00 GMT

Boost 文档对于 shared_ptr 的线�E�安全有一�D�专门的记述�Q�内容如下：
shared_ptr objects offer the same level of thread safety as built-in types. A shared_ptr instance can be "read " (accessed using only const operations) simultaneously by multiple threads. Different shared_ptr instances can be "written to " (accessed using mutable operations such as operator= or reset) simultaneosly by multiple threads (even when these instances are copies, and share the same reference count underneath.)
Any other simultaneous accesses result in undefined behavior.
��译��Z��文如下：
shared_ptr 对象提供与内建类型一��L��U�程安全�U�别。一�? shared_ptr 实例可以同时被多个线�E�“读”（仅��用不变操作进行访问）。不同的 shared_ptr 实例可以同时被多个线�E�“写入”（使用�c�M�� operator= �? reset �q�样的可变操作进行访问）�Q�即使这些实例是拯��Q�而且�׃�n下层的引用计敎ͼ��?
��M��其它的同时访问的�l�果会导致未定义行�ؓ�?img src ="http://www.shnenglu.com/sleepwom/aggbug/124711.html" width = "1" height = "1" />

S.l.e!ep.�K? 2010-08-25 18:36 发表评论