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| <H2>fpos</H2> |
| <P><B>Library:</B> <A HREF="2-11.html">Input/output</A></P> |
| |
| <PRE><HR><B><I>Does not inherit</I></B><HR></PRE> |
| |
| <UL> |
| <LI><A HREF="#sec1">Local Index</A></LI> |
| <LI><A HREF="#sec2">Summary</A></LI> |
| <LI><A HREF="#sec3">Synopsis</A></LI> |
| <LI><A HREF="#sec4">Description</A></LI> |
| <LI><A HREF="#sec5">Interface</A></LI> |
| <LI><A HREF="#sec6">Member Types</A></LI> |
| <LI><A HREF="#sec7">Constructors</A></LI> |
| <LI><A HREF="#sec8">Public Member Functions</A></LI> |
| <LI><A HREF="#sec9">Valid Operations</A></LI> |
| <LI><A HREF="#sec10">See Also</A></LI> |
| <LI><A HREF="#sec11">Standards Conformance</A></LI> |
| </UL> |
| <A NAME="sec1"><H3>Local Index</H3></A> |
| <H4>Members</H4> |
| <UL><TABLE CELLPADDING=3> |
| <TR><TD VALIGN=top> |
| <A HREF="#idx634">fpos()</A><BR> |
| <A HREF="#idx640">operator!=()</A><BR> |
| <A HREF="#idx639">operator+()</A><BR> |
| </TD> |
| <TD VALIGN=top><A HREF="#idx638">operator+=()</A><BR> |
| <A HREF="#idx639">operator-()</A><BR> |
| <A HREF="#idx638">operator-=()</A><BR> |
| </TD> |
| <TD VALIGN=top><A HREF="#idx640">operator==()</A><BR> |
| <A HREF="#idx635">state()</A><BR> |
| <A HREF="#idx633">state_type</A><BR> |
| </TD> |
| <TD VALIGN=top><A HREF="#idx637">streamoff()</A><BR> |
| </TD></TR> |
| </TABLE></UL> |
| |
| <A NAME="sec2"><H3>Summary</H3></A> |
| <P>Class that maintains position information for the <B><I><A HREF="basic-iostream.html">iostream</A></I></B> classes</P> |
| <A NAME="sec3"><H3>Synopsis</H3></A> |
| |
| <PRE>#include <rw/iotraits> |
| |
| namespace std { |
| template<class stateT> |
| class fpos; |
| } |
| </PRE> |
| <A NAME="sec4"><H3>Description</H3></A> |
| <P>The class template <B><I>fpos</I></B> is used by the <B><I><A HREF="basic-iostream.html">iostream</A></I></B> classes to maintain position information. It maintains the absolute position within the external sequence, and the conversion state at that position. Streams instantiated on narrow characters use <B><I>streampos</I></B> as their positioning type, whereas streams instantiated on wide characters use <B><I>wstreampos</I></B>.</P> |
| <A NAME="sec5"><H3>Interface</H3></A> |
| |
| <UL><PRE>namespace std { |
| template <class stateT> |
| class fpos { |
| |
| public: |
| |
| typedef stateT state_type; |
| |
| fpos(streamoff off = 0, |
| state_type = state_type()); |
| |
| void state(state_type); |
| state_type state() const; |
| |
| fpos& operator+=(streamoff); |
| fpos& operator-=(streamoff); |
| |
| fpos& operator+(streamoff) const; |
| fpos& operator-(streamoff) const; |
| |
| bool operator==(const fpos&) const; |
| bool operator+=(const fpos&) const; |
| |
| }; |
| } |
| </PRE></UL> |
| <A NAME="sec6"><H3>Member Types</H3></A> |
| |
| <A NAME="idx633"></A><PRE><B>state_type</B></PRE> |
| <UL> |
| <P>The type <SAMP>state_type</SAMP> is an alias for the template parameter <SAMP>stateT</SAMP>.</P> |
| </UL> |
| |
| <A NAME="sec7"><H3>Constructors</H3></A> |
| |
| <A NAME="idx634"></A><PRE><B>fpos</B>(streamoff off = 0, state_type st = state_type()); </PRE> |
| <UL> |
| <P>Constructs an <B><I>fpos</I></B> object, initializing its position with <SAMP>off</SAMP> and its conversion state with <SAMP>st</SAMP>.</P> |
| </UL> |
| |
| <A NAME="sec8"><H3>Public Member Functions</H3></A> |
| |
| <A NAME="idx635"></A><PRE>state_type |
| <B>state</B>() const; </PRE> |
| <UL> |
| <P>Returns the conversion state stored in the <B><I>fpos</I></B> object. </P> |
| </UL> |
| |
| |
| <A NAME="idx636"></A><PRE>void |
| <B>state</B>(state_type st); </PRE> |
| <UL> |
| <P>Stores <SAMP>st</SAMP> as the new conversion state in the <B><I>fpos</I></B> object.</P> |
| </UL> |
| |
| |
| <A NAME="idx637"></A><PRE>operator <B>streamoff</B>() const;</PRE> |
| <UL> |
| <P>Returns the offset part of the <B><I>fpos</I></B> object without the state information.</P> |
| </UL> |
| |
| |
| <A NAME="idx638"></A><PRE>fpos& <B>operator+=</B>(streamoff off); |
| fpos& <B>operator-=</B>(streamoff off);</PRE> |
| <UL> |
| <P>Adds or subtracts <SAMP>off</SAMP> to or from an <B><I>fpos</I></B> object and assigns the result to it.</P> |
| </UL> |
| |
| |
| <A NAME="idx639"></A><PRE>fpos& <B>operator+</B>(streamoff off) const; |
| fpos& <B>operator-</B>(streamoff off) const;</PRE> |
| <UL> |
| <P>Adds or subtracts <SAMP>off</SAMP> to or from an <B><I>fpos</I></B> object.</P> |
| </UL> |
| |
| |
| <A NAME="idx640"></A><PRE>bool <B>operator==</B>(const fpos&) const; |
| bool <B>operator!=</B>(const fpos&) const;</PRE> |
| <UL> |
| <P>Compares two <B><I>fpos</I></B> objects for [in]equality.</P> |
| </UL> |
| |
| <A NAME="sec9"><H3>Valid Operations</H3></A> |
| <P>In the following,</P> |
| <UL> |
| <LI><P CLASS="LIST"><SAMP>P</SAMP> refers to type <SAMP>fpos<stateT></SAMP></P></LI> |
| <LI><P CLASS="LIST"><SAMP>p</SAMP> and <SAMP>q</SAMP> refer to a value of type <SAMP>fpos<stateT></SAMP></P></LI> |
| <LI><P CLASS="LIST"><SAMP>O</SAMP> refers to the offset type (<SAMP>streamoff</SAMP>, <SAMP>wstreamoff</SAMP>, <SAMP>long</SAMP> ...)</P></LI> |
| <LI><P CLASS="LIST"><SAMP>o</SAMP> refers to a value of the offset type</P></LI> |
| <LI><P CLASS="LIST"><SAMP>i</SAMP> refers to a value of type <SAMP>int</SAMP></P></LI> |
| </UL> |
| <P>Valid operations:</P> |
| <P><TABLE CELLPADDING=3 BORDER=0> |
| <TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>P p( i ); </P></TD> |
| <TD CLASS="LIST"><P CLASS="LIST"></SAMP>Constructs from <SAMP>int</SAMP></P></TD></TR> |
| <TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>P p = i; </P></TD> |
| <TD CLASS="LIST"><P CLASS="LIST"></SAMP>Assigns from <SAMP>int</SAMP></P></TD></TR> |
| <TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>P( o ) </P></TD> |
| <TD CLASS="LIST"><P CLASS="LIST"></SAMP>Converts from offset</P></TD></TR> |
| <TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>O( p ) </P></TD> |
| <TD CLASS="LIST"><P CLASS="LIST"></SAMP>Converts to offset</P></TD></TR> |
| <TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>p == q </P></TD> |
| <TD CLASS="LIST"><P CLASS="LIST"></SAMP>Tests for equality</P></TD></TR> |
| <TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>p != q </P></TD> |
| <TD CLASS="LIST"><P CLASS="LIST"></SAMP>Tests for inequality</P></TD></TR> |
| <TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>q = p + o </P></TD> |
| <TD CLASS="LIST"><P CLASS="LIST"></SAMP>Adds offset</P></TD></TR> |
| <TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>p += o </P></TD> |
| <TD CLASS="LIST"><P CLASS="LIST"></SAMP>Adds offset</P></TD></TR> |
| <TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>q = p -o </P></TD> |
| <TD CLASS="LIST"><P CLASS="LIST"></SAMP>Subtracts offset</P></TD></TR> |
| <TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>q -= o </P></TD> |
| <TD CLASS="LIST"><P CLASS="LIST"></SAMP>Subtracts offset</P></TD></TR> |
| <TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>o = p - q </P></TD> |
| <TD CLASS="LIST"><P CLASS="LIST"></SAMP>Returns offset</P></TD></TR> |
| </TABLE></P> |
| <A NAME="sec10"><H3>See Also</H3></A> |
| <P><A HREF="iosfwd-h.html"><iosfwd></A>, <B><I><A HREF="char-traits.html">char_traits</A></I></B></P> |
| <A NAME="sec11"><H3>Standards Conformance</H3></A> |
| <P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems --Programming Language C++, Section 27.4.3. See also ISO/IEC 9899/AMD1:1995, Amendment 1 to ISO/IEC 9899:1990 C Integrity.</I></P> |
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