[boost-doc-zh] r292 committed - [No log message]

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Date: Tue, 25 Aug 2009 03:19:32 +0000

Revision: 292
Author: totti19851101
Date: Mon Aug 24 20:19:14 2009
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http://code.google.com/p/boost-doc-zh/source/detail?r=292

Modified:
 /trunk/doc/html/boost_asio/tutorial/tuttimer4.html

=======================================

--- /trunk/doc/html/boost_asio/tutorial/tuttimer4.html Wed May 27 03:09:502009+++ /trunk/doc/html/boost_asio/tutorial/tuttimer4.html Mon Aug 24 20:19:142009

@@ -1,6 +1,6 @@
 <html>
 <head>
-<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title>Timer.4 - Using a member function as a handler</title>
 <link rel="stylesheet" href="../../boostbook.css" type="text/css">
 <meta name="generator" content="DocBook XSL Stylesheets V1.74.3">
@@ -24,13 +24,10 @@
 </div>
 <div class="section" lang="en">
 <div class="titlepage"><div><div><h3 class="title">

-<a name="boost_asio.tutorial.tuttimer4"></a><a class="link"href="tuttimer4.html" title="Timer.4 - Using a member function as ahandler"> Timer.4 - Using a member

-      function as a handler</a>

+<a name="boost_asio.tutorial.tuttimer4"></a><a class="link"href="tuttimer4.html" title="Timer.4 - Using a member function as ahandler"> Timer.4 - 成员函数作为回调函数</a>

 </h3></div></div></div>
 <p>

- In this tutorial we will see how to use a class member function asa callback- handler. The program should execute identically to the tutorialprogram from

-        tutorial Timer.3.

+ 在本例中我们将看到怎样使用类成员函数作为回调句柄。程序完成和Timer.3完全同样的功能。

       </p>

<pre class="programlisting">#include<<spanclass="identifier">iostream>#include <spanclass="special"><boost<spanclass="special">/asio<spanclass="special">.hpp<spanclass="special">>

@@ -38,19 +35,15 @@

#include <spanclass="special"><boost<spanclass="special">/date_time<spanclass="special">/posix_time<spanclass="special">/posix_time<spanclass="special">.hpp<spanclass="special">>

 </pre>
 <p>

- Instead of defining a free function <codeclass="computeroutput">print</code>- as the callback handler, as we did in the earlier tutorialprograms, we now- define a class called <code class="computeroutput"><spanclass="identifier">printer</code>.+ 我们现在声明一个名为<code class="computeroutput"><spanclass="identifier">printer</code>的类来取代前个例子程序中的声明的作为回调句柄的自由函数<code class="computeroutput"><spanclass="identifier">print</code>。

       </p>

<pre class="programlisting">class <spanclass="identifier">printer

 <span class="special">{</span>
 <span class="keyword">public</span><span class="special">:</span>
 </pre>
 <p>

- The constructor of this class will take a reference to theio_service object- and use it when initialising the <codeclass="computeroutput">timer_</code>- member. The counter used to shut down the program is now also amember of

-        the class.

+ 这个类的构造函数使用一个io_service对象的引用来初始化<codeclass="computeroutput">timer_</code>

+        成员变量。用来控制关闭程序的计数器现在也是类的一个成员变量。
       </p>

<pre class="programlisting"> printer<spanclass="special">(boost<spanclass="special">::asio<spanclass="special">::io_service<spanclass="special">& io<spanclass="special">): <spanclass="identifier">timer_(<spanclass="identifier">io, <spanclass="identifier">boost::<spanclass="identifier">posix_time::<spanclass="identifier">seconds(<spanclass="number">1)),

@@ -58,24 +51,19 @@
   <span class="special">{</span>
 </pre>
 <p>

- The boost::bind() function works just as well with class memberfunctions- as with free functions. Since all non-static class memberfunctions have- an implicit <code class="computeroutput"><spanclass="keyword">this</code> parameter,- we need to bind <code class="computeroutput"><spanclass="keyword">this</code> to the- function. As in tutorial Timer.3, boost::bind() converts ourcallback handler- (now a member function) into a function object that can be invokedas though- it has the signature <code class="computeroutput"><spanclass="keyword">void(<spanclass="keyword">const boost<spanclass="special">::system<spanclass="special">::error_code<spanclass="special">&)</code>.+ 正如自由函数一样，boost::bind() 也可以很好地用在类成员函数上。所有的non-static 成员函量都有一个隐式的this指针参数，+ 我们需要把它绑定到函数上。就像在示例Timer.3中，boost::bind() 使我们的回调函数（现在是一个成员函数）+ 转变成一个签名为void(const boost::system::error_code&)、且可被调用的函数对象。

       </p>
 <p>

- You will note that the boost::asio::placeholders::errorplaceholder is not- specified here, as the <code class="computeroutput"><spanclass="identifier">print</code>

-        member function does not accept an error object as a parameter.

+ 你可能注意到在这里我们并没有指定boost::asio::placeholders::error 占位符，这是因为<code class="computeroutput"><spanclass="identifier">print</code>

+        成员函数并不接受一个error 对象作为参数。
       </p>

<pre class="programlisting"> <spanclass="identifier">timer_.<spanclass="identifier">async_wait(<spanclass="identifier">boost::<spanclass="identifier">bind(&<spanclass="identifier">printer::<spanclass="identifier">print, <spanclass="keyword">this));

   <span class="special">}</span>
 </pre>
 <p>

- In the class destructor we will print out the final value of thecounter.

+        在类的析构函数中我们将打印计数器变量的最终值。
       </p>

<pre class="programlisting"> ~<spanclass="identifier">printer()

   <span class="special">{</span>
@@ -83,10 +71,8 @@
   <span class="special">}</span>
 </pre>
 <p>

- The <code class="computeroutput"><spanclass="identifier">print</code> member function- is very similar to the <code class="computeroutput"><spanclass="identifier">print</code>- function from tutorial Timer.3, except that it now operates on theclass- data members instead of having the timer and counter passed in asparameters.+ 这个<code class="computeroutput"><spanclass="identifier">print</code>成员函数同示例Timer.3中的<codeclass="computeroutput">print</code>+ 函数很相似，唯一不同的是它现在操作类的数据成员而不是作为参数传递来的定时器和计数器。

       </p>

<pre class="programlisting"> void <spanclass="identifier">print()

   <span class="special">{</span>
@@ -106,9 +92,8 @@
 <span class="special">};</span>
 </pre>
 <p>

- The <code class="computeroutput"><spanclass="identifier">main</code> function is much- simpler than before, as it now declares a local <codeclass="computeroutput">printer</code>

-        object before running the io_service as normal.

+ <code class="computeroutput"><spanclass="identifier">main</code>函数比前面简单多了。像平常一样运行io_service对象之前，它现在需要声明一个局部的<codeclass="computeroutput">printer</code>

+       对象。
       </p>

<pre class="programlisting">int <spanclass="identifier">main()

 <span class="special">{</span>
@@ -120,18 +105,16 @@
 <span class="special">}</span>
 </pre>
 <p>

- See the <a class="link" href="tuttimer4/src.html" title="Sourcelisting for Timer.4">full source listing</a>+ 查看<a class="link" href="tuttimer4/src.html" title="Sourcelisting for Timer.4">本例全部源代码</a>

       </p>
 <p>

- Return to the <a class="link" href="../tutorial.html"title="Tutorial">tutorial index</a>+ 返回<a class="link" href="../tutorial.html" title="Tutorial">指南</a>

       </p>
 <p>

- Previous: <a class="link" href="tuttimer3.html" title="Timer.3 -Binding arguments to a handler">Timer.3 - Binding

-        arguments to a handler</a>

+ 前一例: <a class="link" href="tuttimer3.html" title="Timer.3 -Binding arguments to a handler">Timer.3 - 回调函数绑定参数</a>

       </p>
 <p>

- Next: <a class="link" href="tuttimer5.html" title="Timer.5 -Synchronising handlers in multithreaded programs">Timer.5 - Synchronising

-        handlers in multithreaded programs</a>

+ 下一例: <a class="link" href="tuttimer5.html" title="Timer.5 -Synchronising handlers in multithreaded programs">Timer.5 - 多线程同步回调</a>

       </p>
 </div>

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