ios.htm

这是关于VC++中的STL容器的资料,包括了STL容器各个类之间关系以及类的说明

Return            None
</pre>




<h3>Description</h3>       
<p>           
This exceptions() method sets the exception mask that is associated with the ios object.
The exception mask determines additional conditions under which the clear() method will
throw an exception. For example:
</p>
<p>
cout.execptions(ios_base::badbit | ios_base::failbit);
</p>
<p>
sets the exception mask so that clear() will throw an exception when badbit or failbit
is set.
</p>
<hr>
<pre>

<a name="fail">Method            fail()</a>

Access            Public

Classification    Accessor

Syntax            bool fail() const;      

Parameters        None

Return            The fail() method returns true(non zero value) if either the badbit is set or the
                  failbit is set.  

</pre>




<h3>Description</h3>       
<p> 
If a buffer is in a bad state it is also in a fail state.  However, a buffer can be in a fail
state without being in a bad state. An operation may fail and the stream may still be usable.
However if badbit is set then the stream is not usable. The fail() member function 
returns true(non zero value) if either the badbit is set or the failbit is set.  
</p>
<hr>
<pre>

<a name="fill1">Method            fill()</a>

Access            Public

Classification    Accessor

Syntax            char_type fill() const;      

Parameters        None

Return            The fill() method returns the current fill character
</pre>




<h3>Description</h3>       
<p>
This fill() method returns the fill character and takes no arguments.
</p>
<hr>
<pre>

<a name="fill2">Method            fill()</a>

Access            Public

Classification    Modifier

Syntax            char_type fill(char_type Ch);      

Parameters        None

Return            The fill() method returns the previous fill character

</pre>




<h3>Description</h3>       
<p>
The fill() method will set the fill character to Ch and return the previous fill character.
</p>
<hr>
<pre>


<a name="good">Method            good()</a>

Access            Public

Classification    Accessor

Syntax            bool good() const;      

Parameters        None

Return            If no iostate flags are set then good() returns true.
</pre>





<h3>Description</h3>       
<p>
The good() member function returns a non zero value if the buffer component is in a good state.
</p>
<hr>
<pre>

<a name="init">Method            init()</a>

Classification    Modifier

Access            Protected

Syntax            void init(basic_streambuf&lt;charT,traits&gt;* Sb);

Parameters        Sb is a pointer to a basic_streambuf object.  The Sb
                  object will be used as the buffer for the connected stream. 

Return            None
</pre>





<h3>Description</h3>       

<p>
The init() method helps to initialize the data members of the ios_base and basic_ios components.
The flags are initialized to either goodbit or badbit. After init(Sb) the width() method
will return zero. The default precision will be set to 6. The fill character will be ' '.
Locale is set to the standard locale. Both iword and pword are set to null.
</p>
<hr>
<pre>

<a name="rdbuf1">Method            rdbuf()</a>

Access            Public

Classification    Accessor

Syntax            basic_streambuf&lt;charT,traits&gt;* rdbuf() const;

Parameters        None

Return            This method returns a pointer to the current streambuf object that is contained
                  in the ios component.

</pre>



<h3>Description</h3>       
<p>
This rdbuf() method returns the buffer component of the ios object.
</p>
<hr>
<pre>


<a name="rdbuf2">Method            rdbuf()</a>

Syntax            basic_streambuf&lt;charT,traits&gt;* rdbuf(basic_streambuf&lt;charT,traits&gt;* Sb);

Classification    Modifier

Access            Public

Parameters        The pointer to the buffer component of the ios object will be set to
                  to the value of Sb.

Return            This method returns a pointer to the previous streambuf object that is contained
                  in the ios component.
</pre>




<h3>Description</h3>
<p>
This rdbuf() method updates the streambuf pointer to the pointer stored in Sb. The
method returns a pointer to the previous buffer.
</p>
<hr>
<pre>
       

<a name="rdstate">Method            rdstate()</a>

Access            Public

Classification    Accessor

Syntax            iostate rdstate() const;

Parameters        None

Return            This method returns a copy of the stream state variable.
</pre>                  





<h3>Description</h3>       

<p>
This method returns the stream state.
</p>
<hr>
<pre>

<a name="setstate">Method            setstate()</a>

Classification    Modifier

Access            Public

Syntax            void setstate(iostate State);

Parameters        The value of State is the new value for the corresponding bit in the
                  stream state variable.

Return            None
</pre>                  





<h3>Description</h3>       
<p>
The setstate() method resets the iostate variable to the value stored in State.
</p>
<hr>
<pre>

<a name="tie1">Method            tie()</a>

Access            Public

Classification    Accessor

Syntax            basic_ostream<charT,traits>* tie() const;

Parameters        None

Return            a pointer to the stream that is currently tied.
</pre>                  





<h3>Description</h3>       
<p>
This tie() method returns a pointer the stream (if any) that is tied to the
stream connected to this ios object.
</p>
<hr>
<pre>

<a name="tie2">Method            tie()</a>

Access            Public

Classification    Modifier

Syntax            basic_ostream&lt;charT,traits&gt;* tie(basic_ostream&lt;charT,traits&gt;* Str);


Parameters        Str will point to a new stream to tie the current stream to.

Return            a pointer to the previously tied stream.
                  
</pre>

<h3>Description</h3>
<p>
This tie() method will tie Str to the stream that is currently connected to this
ios object. This tie() method returns a pointer the stream (if any) that was tied to the
stream connected to this ios object.
</p>
<hr>

<p>
<a name="diagram"><h2>The Class Relationship Diagram of basic_ios</h2></a>
<img src="basicios.gif">
</p>
<hr>

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