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<BR Clear>
<H1>Sequence</H1>

<Table CellPadding=0 CellSpacing=0 width=100%>
<TR>
<TD Align=left><Img src = "containers.gif" Alt=""   WIDTH = "194"  HEIGHT = "38" ></TD>
<TD Align=right><Img src = "concept.gif" Alt=""   WIDTH = "194"  HEIGHT = "38" ></TD>
</TR>
<TR>
<TD Align=left VAlign=top><b>Category</b>: containers</TD>
<TD Align=right VAlign=top><b>Component type</b>: concept</TD>
</TR>
</Table>

<h3>Description</h3>
A Sequence is a variable-sized <A href="Container.html">Container</A> whose
elements are arranged in a strict linear order.  It supports insertion
and removal of elements.
<h3>Refinement of</h3>
<A href="ForwardContainer.html">Forward Container</A>, <A href="DefaultConstructible.html" tppabs="http://www.sgi.com/Technology/STL/DefaultConstructible.shtml">Default Constructible</A>
<h3>Associated types</h3>
None, except for those of <A href="ForwardContainer.html">Forward Container</A>.
<h3>Notation</h3>
<Table>
<TR>
<TD VAlign=top>
<tt>X</tt>
</TD>
<TD VAlign=top>
A type that is a model of Sequence
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>a</tt>, <tt>b</tt>
</TD>
<TD VAlign=top>
Object of type <tt>X</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>T</tt>
</TD>
<TD VAlign=top>
The value type of <tt>X</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>t</tt>
</TD>
<TD VAlign=top>
Object of type <tt>T</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>p</tt>, <tt>q</tt>
</TD>
<TD VAlign=top>
Object of type <tt>X::iterator</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>n</tt>
</TD>
<TD VAlign=top>
Object of a type convertible to <tt>X::size_type</tt>
</TD>
</tr>
</table>
<h3>Definitions</h3>
If <tt>a</tt> is a Sequence, then <tt>p</tt> is a
<i>valid iterator in a</i> if it is a valid (nonsingular) iterator that is 
reachable from <tt>a.begin()</tt>.
<P>
If <tt>a</tt> is a Sequence, then <tt>[p, q)</tt> is a <i>valid range in a</i>
if <tt>p</tt> and <tt>q</tt> are valid iterators in <tt>a</tt> and if <tt>q</tt> is reachable
from <tt>p</tt>.
<h3>Valid expressions</h3>
In addition to the expressions defined in <A href="ForwardContainer.html">Forward Container</A>, the
following expressions must be valid.
<Table border>
<TR>
<TH>
Name
</TH>
<TH>
Expression
</TH>
<TH>
Type requirements
</TH>
<TH>
Return type
</TH>
</TR>
<TR>
<TD VAlign=top>
Fill constructor
</TD>
<TD VAlign=top>
<tt>X(n, t)</tt>
</TD>
<TD VAlign=top>
&nbsp;
</TD>
<TD VAlign=top>
<tt>X</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
Fill constructor
</TD>
<TD VAlign=top>
<tt>X a(n, t);</tt>
</TD>
<TD VAlign=top>
&nbsp;
</TD>
<TD VAlign=top>
&nbsp;
</TD>
</TR>
<TR>
<TD VAlign=top>
Default fill constructor
</TD>
<TD VAlign=top>
<tt>X(n)</tt>
</TD>
<TD VAlign=top>
<tt>T</tt> is <A href="DefaultConstructible.html">DefaultConstructible</A>.
</TD>
<TD VAlign=top>
<tt>X</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
Default fill constructor
</TD>
<TD VAlign=top>
<tt>X a(n);</tt>
</TD>
<TD VAlign=top>
<tt>T</tt> is <A href="DefaultConstructible.html">DefaultConstructible</A>.
</TD>
<TD VAlign=top>
&nbsp;
</TD>
</TR>
<TR>
<TD VAlign=top>
Range constructor
</TD>
<TD VAlign=top>
<tt>X(i, j)</tt>
</TD>
<TD VAlign=top>
<tt>i</tt> and <tt>j</tt> are <A href="InputIterator.html">Input Iterators</A> whose value type is convertible
   to <tt>T</tt> <A href="#1">[1]</A>
</TD>
<TD VAlign=top>
<tt>X</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
Range constructor
</TD>
<TD VAlign=top>
<tt>X a(i, j);</tt>
</TD>
<TD VAlign=top>
<tt>i</tt> and <tt>j</tt> are <A href="InputIterator.html">Input Iterators</A> whose value type is convertible
   to <tt>T</tt> <A href="#1">[1]</A>
</TD>
<TD VAlign=top>
&nbsp;
</TD>
</TR>
<TR>
<TD VAlign=top>
Front
</TD>
<TD VAlign=top>
<tt>a.front()</tt>
</TD>
<TD VAlign=top>
&nbsp;
</TD>
<TD VAlign=top>
<tt>reference</tt> if <tt>a</tt> is mutable, <tt>const_reference</tt> otherwise.
</TD>
</TR>
<TR>
<TD VAlign=top>
Insert
</TD>
<TD VAlign=top>
<tt>a.insert(p, t)</tt>
</TD>
<TD VAlign=top>
&nbsp;
</TD>
<TD VAlign=top>
<tt>X::iterator</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
Fill insert
</TD>
<TD VAlign=top>
<tt>a.insert(p, n, t)</tt>
</TD>
<TD VAlign=top>
<tt>a</tt> is mutable
</TD>
<TD VAlign=top>
<tt>void</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
Range insert
</TD>
<TD VAlign=top>
<tt>a.insert(p, i, j)</tt>
</TD>
<TD VAlign=top>
<tt>i</tt> and <tt>j</tt> are <A href="InputIterator.html">Input Iterators</A> whose value type is convertible
   to <tt>T</tt> <A href="#1">[1]</A>.  <tt>a</tt> is mutable
</TD>
<TD VAlign=top>
<tt>void</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
Erase
</TD>
<TD VAlign=top>
<tt>a.erase(p)</tt>
</TD>
<TD VAlign=top>
<tt>a</tt> is mutable
</TD>
<TD VAlign=top>
<tt>iterator</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
Range erase
</TD>
<TD VAlign=top>
<tt>a.erase(p,q)</tt>
</TD>
<TD VAlign=top>
<tt>a</tt> is mutable
</TD>
<TD VAlign=top>
<tt>iterator</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
Clear
</TD>
<TD VAlign=top>
<tt>a.clear()</tt>
</TD>
<TD VAlign=top>
<tt>a</tt> is mutable
</TD>
<TD VAlign=top>
<tt>void</tt>
</TD>
</tr>
</table>
<h3>Expression semantics</h3>
Semantics of an expression is defined only where it is not defined in
<A href="ForwardContainer.html">Forward Container</A>, or where it differs.
<Table border>
<TR>
<TH>
Name
</TH>
<TH>
Expression
</TH>
<TH>
Precondition
</TH>
<TH>
Semantics
</TH>
<TH>
Postcondition
</TH>
</TR>
<TR>
<TD VAlign=top>
Fill constructor
</TD>
<TD VAlign=top>
<tt>X(n, t)</tt>
</TD>
<TD VAlign=top>
<tt>n &gt;= 0</tt>
</TD>
<TD VAlign=top>
Creates a sequence with <tt>n</tt> copies of <tt>t</tt>
</TD>
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