logerror.htm

来自「使用C++开发过程中」· HTM 代码 · 共 129 行

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<title> The logic_error Class</title>
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<img src="leban3.gif">


<pre>

<font size=5>Class Name</font>            logic_error

<font size=5>Header File</font>          &lt;stdexcept&gt;

<font size=5>Classification</font>      Error Handling (Node Class)

</pre>

<a href="logerror.htm#diagram">Family of logic_error Classes</a><br>
<br>
<a href="logerror.htm#desc">Class Description</a><br>

<h1>Member Classes</h1>
<p>
None
</p>

<h1>Methods</h1>
<pre>

<a href="logerror.htm#logicerror">logic_error(const string &What_Arg)</a>

</pre>

<a href="logerror.htm#example"><h2>Example</h2></a><br>
<hr>
<a name="desc"><h3>Class Description</h3></a>
<p>
The logic_error class  is derived from the  exception class.  The logic_error
class represents exceptions that are the result of violating a functional 
specification for the software component that is throwing the exception.  The
logic_error class of exceptions is distinguished from the runtime_error class
of exceptions by the fact that runtime_error class exceptions represent  run time
or execution time hardware or software anomalies.  Where as the logic_error class
of exceptions represent defects in the implementation of the algorithms, procedures,
or functions that make up the software component that throws the exception.  Further,
the defects of the logic_error class variety can potentially be identified before 
the software component is executed. This class represents a node class and  can 
therefore be used as a base class for user defined classes. The current version of the
C++ standard  does not require any method in the standard C++ classes to throw  and 
exception of the  base class logic_error.
</p>
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<pre>

<a name="logicerror">Method            logic_error()</a>

Access            Public

Classification    Constructor

Syntax            logic_error(const string &What_Arg)      

Parameters        The What_Arg parameter should contain a description of the kind of exception
                  that has occurred.

Return            None

</pre>

<h3>Description</h3>
<p>
The logic_error() method constructs an object of type logic_error.  The What_Arg parameter
can be used to set a description of the kind of error that this exception represents. 
A set possible solutions is sometimes supplied with the exception description in addition
to the type of error.
</p>
<hr>
<a name="diagram"><h2>Family of logic_error Classes</h2></a>
<img src="logic.gif">
<hr>
<a name="example"></a>
<img src="lego.gif">
<pre>

    1   
    2   #include &lt;stdexcept&gt;
    3   
    4   
    5   void main(void)
    6   {
    7   
    8   
    9      try{
   10   
   11            exception X;
   12            throw(X);
   13      }
   14      catch(const exception &X)
   15      {
   16          cout &lt;&lt; X.what() &lt;&lt; endl;
   17   
   18      }
   19   
   20      try
   21      {      
   22          logic_error Logic("Logic Mistake");
   23          throw(Logic);
   24      }
   25      catch(const exception &X)
   26      {
   27          cout &lt;&lt; X.what() &lt;&lt; endl;
   28      }     
   29      
   30   
   31   
   32   }
   33   
</pre>
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