fstream.html

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<H3><A NAME="basic_fstream::open"><CODE>basic_fstream::open</CODE></A></H3>

<PRE>void <B>open</B>(const char *filename,
    ios_base::openmode mode =
        ios_base::in | ios_base::out);</PRE>

<P>The member function calls
<CODE><A HREF="#basic_fstream::rdbuf">rdbuf</A>()-&gt;
<A HREF="#basic_filebuf::open">open</A>(filename, mode)</CODE>.
If that function returns a null pointer, the function calls
<CODE><A HREF="ios.html#basic_ios::setstate">setstate</A>(failbit)</CODE>.</P>

<H3><A NAME="basic_fstream::rdbuf"><CODE>basic_fstream::rdbuf</CODE></A></H3>

<PRE>basic_filebuf&lt;Elem, Tr&gt; *<B>rdbuf</B>() const</PRE>

<P>The member function returns the address of the stored
stream buffer, of type pointer to
<CODE><A HREF="#basic_filebuf">basic_filebuf</A>&lt;Elem, Tr&gt;</CODE>.</P>

<H2><A NAME="basic_ifstream"><CODE>basic_ifstream</CODE></A></H2>

<PRE>template &lt;class Elem, class Tr = char_traits&lt;Elem&gt; &gt;
    class <B>basic_ifstream</B> : public basic_istream&lt;Elem, Tr&gt; {
public:
    basic_filebuf&lt;Elem, Tr&gt; *<B><A HREF="#basic_ifstream::rdbuf">rdbuf</A></B>() const;
    <B><A HREF="#basic_ifstream::basic_ifstream">basic_ifstream</A></B>();
    explicit <B><A HREF="#basic_ifstream::basic_ifstream">basic_ifstream</A></B>(const char *filename,
        ios_base::openmode mode = ios_base::in);
    bool <B><A HREF="#basic_ifstream::is_open">is_open</A></B>() const;
    void <B><A HREF="#basic_ifstream::open">open</A></B>(const char *filename,
        ios_base::openmode mode = ios_base::in);
    void <B><A HREF="#basic_ifstream::close">close</A></B>();
    };</PRE>

<P>The template class describes an object that controls
extraction of elements and encoded objects from a
<A HREF="streambu.html#stream buffer">stream buffer</A> of class
<CODE><A HREF="#basic_filebuf">basic_filebuf</A>&lt;Elem, Tr&gt;</CODE>,
with elements of type <CODE>Elem</CODE>, whose
<A HREF="string2.html#character traits">character traits</A> are determined
by the class <CODE>Tr</CODE>. The object stores an object of class
<CODE>basic_filebuf&lt;Elem, Tr&gt;</CODE>.</P>

<H3><A NAME="basic_ifstream::basic_ifstream"><CODE>basic_ifstream::basic_ifstream</CODE></A></H3>

<PRE><B>basic_ifstream</B>();
explicit <B>basic_ifstream</B>(const char *filename,
    ios_base::openmode mode = ios_base::in);</PRE>

<P>The first constructor initializes the base class by calling
<CODE><A HREF="istream.html#basic_istream::basic_istream">basic_istream</A>(sb)</CODE>,
where <CODE>sb</CODE> is the stored object of class
<CODE><A HREF="#basic_filebuf">basic_filebuf</A>&lt;Elem, Tr&gt;</CODE>.
It also initializes <CODE>sb</CODE> by calling
<CODE><A HREF="#basic_filebuf::basic_filebuf">basic_filebuf</A>&lt;Elem,
Tr&gt;()</CODE>.</P>

<P>The second constructor initializes the base class by calling
<CODE>basic_istream(sb)</CODE>.
It also initializes <CODE>sb</CODE> by calling
<CODE><A HREF="#basic_filebuf::basic_filebuf">basic_filebuf</A>&lt;Elem, Tr&gt;()</CODE>,
then <CODE>sb.<A HREF="#basic_filebuf::open">open</A>(filename, mode
| ios_base::in)</CODE>. If the latter function returns a null
pointer, the constructor calls
<CODE><A HREF="ios.html#basic_ios::setstate">setstate</A>(failbit)</CODE>.</P>

<H3><A NAME="basic_ifstream::close"><CODE>basic_ifstream::close</CODE></A></H3>

<PRE>void <B>close</B>();</PRE>

<P>The member function calls
<CODE><A HREF="#basic_ifstream::rdbuf">rdbuf</A>()-&gt;
<A HREF="#basic_filebuf::close">close</A>()</CODE>.</P>

<H3><A NAME="basic_ifstream::is_open"><CODE>basic_ifstream::is_open</CODE></A></H3>

<PRE>bool <B>is_open</B>();</PRE>

<P>The member function returns
<CODE><A HREF="#basic_ifstream::rdbuf">rdbuf</A>()-&gt;
<A HREF="#basic_filebuf::is_open">is_open</A>()</CODE>.</P>

<H3><A NAME="basic_ifstream::open"><CODE>basic_ifstream::open</CODE></A></H3>

<PRE>void <B>open</B>(const char *filename,
    ios_base::openmode mode = ios_base::in);</PRE>

<P>The member function calls
<CODE><A HREF="#basic_ifstream::rdbuf">rdbuf</A>()-&gt;
<A HREF="#basic_filebuf::open">open</A>(filename, mode | ios_base::in)</CODE>.
If that function returns a null pointer, the function calls
<CODE><A HREF="ios.html#basic_ios::setstate">setstate</A>(failbit)</CODE>.</P>

<H3><A NAME="basic_ifstream::rdbuf"><CODE>basic_ifstream::rdbuf</CODE></A></H3>

<PRE>basic_filebuf&lt;Elem, Tr&gt; *<B>rdbuf</B>() const</PRE>

<P>The member function returns the address of the stored stream buffer.</P>

<H2><A NAME="basic_ofstream"><CODE>basic_ofstream</CODE></A></H2>

<PRE>template &lt;class Elem, class Tr = char_traits&lt;Elem&gt; &gt;
    class <B>basic_ofstream</B> : public basic_ostream&lt;Elem, Tr&gt; {
public:
    basic_filebuf&lt;Elem, Tr&gt; *<B><A HREF="#basic_ofstream::rdbuf">rdbuf</A></B>() const;
    <B><A HREF="#basic_ofstream::basic_ofstream">basic_ofstream</A></B>();
    explicit <B><A HREF="#basic_ofstream::basic_ofstream">basic_ofstream</A></B>(const char *filename,
        ios_base::openmode mode = ios_base::out);
    bool <B><A HREF="#basic_ofstream::is_open">is_open</A></B>() const;
    void <B><A HREF="#basic_ofstream::open">open</A></B>(const char *filename,
        ios_base::openmode mode = ios_base::out);
    void <B><A HREF="#basic_ofstream::close">close</A></B>();
    };</PRE>

<P>The template class describes an object that controls
insertion of elements and encoded objects into a
<A HREF="streambu.html#stream buffer">stream buffer</A> of class
<CODE><A HREF="#basic_filebuf">basic_filebuf</A>&lt;Elem, Tr&gt;</CODE>,
with elements of type <CODE>Ele</CODE>, whose
<A HREF="string2.html#character traits">character traits</A> are determined
by the class <CODE>Tr</CODE>. The object stores an object of class
<CODE>basic_filebuf&lt;Elem, Tr&gt;</CODE>.</P>

<H3><A NAME="basic_ofstream::basic_ofstream"><CODE>basic_ofstream::basic_ofstream</CODE></A></H3>

<PRE><B>basic_ofstream</B>();
explicit <B>basic_ofstream</B>(const char *filename,
    ios_base::openmode which = ios_base::out);</PRE>

<P>The first constructor initializes the base class by calling
<CODE><A HREF="ostream.html#basic_ostream::basic_ostream">basic_ostream</A>(sb)</CODE>,
where <CODE>sb</CODE> is the stored object of class
<CODE><A HREF="#basic_filebuf">basic_filebuf</A>&lt;Elem, Tr&gt;</CODE>.
It also initializes <CODE>sb</CODE> by calling
<CODE><A HREF="#basic_filebuf::basic_filebuf">basic_filebuf</A>&lt;Elem, Tr&gt;()</CODE>.</P>

<P>The second constructor initializes the base class by calling
<CODE>basic_ostream(sb)</CODE>.
It also initializes <CODE>sb</CODE> by calling
<CODE><A HREF="#basic_filebuf::basic_filebuf">basic_filebuf</A>&lt;Elem, Tr&gt;()</CODE>,
then <CODE>sb.<A HREF="#basic_filebuf::open">open</A>(filename, mode
| ios_base::out)</CODE>. If the latter function returns a null
pointer, the constructor calls
<CODE><A HREF="ios.html#basic_ios::setstate">setstate</A>(failbit)</CODE>.</P>

<H3><A NAME="basic_ofstream::close"><CODE>basic_ofstream::close</CODE></A></H3>

<PRE>void <B>close</B>();</PRE>

<P>The member function calls
<CODE><A HREF="#basic_ofstream::rdbuf">rdbuf</A>()-&gt;
<A HREF="#basic_filebuf::close">close</A>()</CODE>.</P>

<H3><A NAME="basic_ofstream::is_open"><CODE>basic_ofstream::is_open</CODE></A></H3>

<PRE>bool <B>is_open</B>();</PRE>

<P>The member function returns
<CODE><A HREF="#basic_ofstream::rdbuf">rdbuf</A>()-&gt;
<A HREF="#basic_filebuf::is_open">is_open</A>()</CODE>.</P>

<H3><A NAME="basic_ofstream::open"><CODE>basic_ofstream::open</CODE></A></H3>

<PRE>void <B>open</B>(const char *filename,
    ios_base::openmode mode = ios_base::out);</PRE>

<P>The member function calls
<CODE><A HREF="#basic_ofstream::rdbuf">rdbuf</A>()-&gt;
<A HREF="#basic_filebuf::open">open</A>(filename, mode | ios_base::out)</CODE>.
If that function returns a null pointer, the function calls
<CODE><A HREF="ios.html#basic_ios::setstate">setstate</A>(failbit)</CODE>.</P>

<H3><A NAME="basic_ofstream::rdbuf"><CODE>basic_ofstream::rdbuf</CODE></A></H3>

<PRE>basic_filebuf&lt;Elem, Tr&gt; *<B>rdbuf</B>() const</PRE>

<P>The member function returns the address of the stored
stream buffer.</P>

<H2><A NAME="filebuf"><CODE>filebuf</CODE></A></H2>

<PRE>typedef basic_filebuf&lt;char, char_traits&lt;char&gt; &gt; <B>filebuf</B>;</PRE>

<P>The type is a synonym for template class
<A HREF="#basic_filebuf"><CODE>basic_filebuf</CODE></A>, specialized
for elements of type <I>char</I> with default
<A HREF="string2.html#character traits">character traits</A>.</P>

<H2><A NAME="fstream"><CODE>fstream</CODE></A></H2>

<PRE>typedef basic_fstream&lt;char, char_traits&lt;char&gt; &gt; <B>fstream</B>;</PRE>

<P>The type is a synonym for template class
<A HREF="#basic_fstream"><CODE>basic_fstream</CODE></A>, specialized
for elements of type <I>char</I> with default
<A HREF="string2.html#character traits">character traits</A>.</P>

<H2><A NAME="ifstream"><CODE>ifstream</CODE></A></H2>

<PRE>typedef basic_ifstream&lt;char, char_traits&lt;char&gt; &gt; <B>ifstream</B>;</PRE>

<P>The type is a synonym for template class
<A HREF="#basic_ifstream"><CODE>basic_ifstream</CODE></A>, specialized
for elements of type <I>char</I> with default
<A HREF="string2.html#character traits">character traits</A>.</P>

<H2><A NAME="ofstream"><CODE>ofstream</CODE></A></H2>

<PRE>typedef basic_ofstream&lt;char, char_traits&lt;char&gt; &gt;
    <B>ofstream</B>;</PRE>

<P>The type is a synonym for template class
<A HREF="#basic_ofstream"><CODE>basic_ofstream</CODE></A>, specialized
for elements of type <I>char</I> with default
<A HREF="string2.html#character traits">character traits</A>.</P>

<H2><A NAME="wfstream"><CODE>wfstream</CODE></A></H2>

<PRE>typedef basic_fstream&lt;wchar_t, char_traits&lt;wchar_t&gt; &gt;
    <B>wfstream</B>;</PRE>

<P>The type is a synonym for template class
<A HREF="#basic_fstream"><CODE>basic_fstream</CODE></A>, specialized
for elements of type <CODE>wchar_t</CODE> with default
<A HREF="string2.html#character traits">character traits</A>.</P>

<H2><A NAME="wifstream"><CODE>wifstream</CODE></A></H2>

<PRE>typedef basic_ifstream&lt;wchar_t, char_traits&lt;wchar_t&gt; &gt;
    <B>wifstream</B>;</PRE>

<P>The type is a synonym for template class
<A HREF="#basic_ifstream"><CODE>basic_ifstream</CODE></A>, specialized
for elements of type <CODE>wchar_t</CODE> with default
<A HREF="string2.html#character traits">character traits</A>.</P>

<H2><A NAME="wofstream"><CODE>wofstream</CODE></A></H2>

<PRE>typedef basic_ofstream&lt;wchar_t, char_traits&lt;wchar_t&gt; &gt;
    <B>wofstream</B>;</PRE>

<P>The type is a synonym for template class
<A HREF="#basic_ofstream"><CODE>basic_ofstream</CODE></A>, specialized
for elements of type <CODE>wchar_t</CODE> with default
<A HREF="string2.html#character traits">character traits</A>.</P>

<H2><A NAME="wfilebuf"><CODE>wfilebuf</CODE></A></H2>

<PRE>typedef basic_filebuf&lt;wchar_t, char_traits&lt;wchar_t&gt; &gt;
    <B>wfilebuf</B>;</PRE>

<P>The type is a synonym for template class
<A HREF="#basic_filebuf"><CODE>basic_filebuf</CODE></A>, specialized
for elements of type <CODE>wchar_t</CODE> with default
<A HREF="string2.html#character traits">character traits</A>.</P>

<HR>
<P>See also the
<B><A HREF="index.html#Table of Contents">Table of Contents</A></B> and the
<B><A HREF="_index.html">Index</A></B>.</P>

<P><I>
<A HREF="crit_pjp.html">Copyright</A> &#169; 1992-2002
by P.J. Plauger. All rights reserved.</I></P>

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