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<Head>
<Title>mismatch</Title>
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<H1>mismatch</H1>
<Table CellPadding=0 CellSpacing=0 width=100%>
<TR>
<TD Align=left><Img src = "algorithms.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD>
<TD Align=right><Img src = "function.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD>
</TR>
<TR>
<TD Align=left VAlign=top><b>Category</b>: algorithms</TD>
<TD Align=right VAlign=top><b>Component type</b>: function</TD>
</TR>
</Table>
<h3>Prototype</h3>
<tt>Mismatch</tt> is an overloaded name; there are actually two <tt>mismatch</tt>
functions.
<pre>
template <class <A href="InputIterator.html">InputIterator</A>1, class <A href="InputIterator.html">InputIterator</A>2>
<A href="pair.html">pair</A><InputIterator1, InputIterator2>
mismatch(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2);
template <class <A href="InputIterator.html">InputIterator</A>1, class <A href="InputIterator.html">InputIterator</A>2,
class <A href="BinaryPredicate.html">BinaryPredicate</A>>
<A href="pair.html">pair</A><InputIterator1, InputIterator2>
mismatch(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2,
BinaryPredicate binary_pred);
</pre>
<h3>Description</h3>
<tt>Mismatch</tt> finds the first position where the two ranges <tt>[first1, last1)</tt>
and <tt>[first2, first2 + (last1 - first1))</tt> differ. The two
versions of <tt>mismatch</tt> use different tests for whether elements differ.
<P>
The first version of <tt>mismatch</tt> finds
the first iterator <tt>i</tt> in <tt>[first1, last1)</tt> such that <tt>*i != *(first2
+ (i - first1))</tt>. The return value is a pair whose first element is
<tt>i</tt> and whose second element is <tt>*(first2 + (i - first1))</tt>. If no
such iterator <tt>i</tt> exists, the return value is a pair whose first
element is <tt>last1</tt> and whose second element is
<tt>*(first2 + (last1 - first1))</tt>.
<P>
The second version of <tt>mismatch</tt> finds
the first iterator <tt>i</tt> in <tt>[first1, last1)</tt> such that <tt>binary_pred(*i,
*(first2 + (i - first1))</tt> is <tt>false</tt>. The return value is a pair
whose first element is <tt>i</tt> and whose second element is
<tt>*(first2 + (i - first1))</tt>. If no such iterator <tt>i</tt> exists, the
return value is a pair whose first element is <tt>last1</tt> and whose second
element is <tt>*(first2 + (last1 - first1))</tt>.
<h3>Definition</h3>
Defined in the standard header <A href="algorithm">algorithm</A>, and in the nonstandard
backward-compatibility header <A href="algo.h">algo.h</A>.
<h3>Requirements on types</h3>
For the first version:
<UL>
<LI>
<tt>InputIterator1</tt> is a model of <A href="InputIterator.html">Input Iterator</A>.
<LI>
<tt>InputIterator2</tt> is a model of <A href="InputIterator.html">Input Iterator</A>.
<LI>
<tt>InputIterator1</tt>'s value type is a model of <A href="EqualityComparable.html">Equality Comparable</A>.
<LI>
<tt>InputIterator2</tt>'s value type is a model of <A href="EqualityComparable.html">Equality Comparable</A>.
<LI>
<tt>InputIterator1</tt>'s value type can be compared for equality with
<tt>InputIterator2</tt>'s value type.
</UL>
For the second version:
<UL>
<LI>
<tt>InputIterator1</tt> is a model of <A href="InputIterator.html">Input Iterator</A>.
<LI>
<tt>InputIterator2</tt> is a model of <A href="InputIterator.html">Input Iterator</A>.
<LI>
<tt>BinaryPredicate</tt> is a model of <A href="BinaryPredicate.html">Binary Predicate</A>.
<LI>
<tt>InputIterator1</tt>'s value type is convertible to <tt>BinaryPredicate</tt>'s
first argument type.
<LI>
<tt>InputIterator2</tt>'s value type is convertible to <tt>BinaryPredicate</tt>'s
second argument type.
</UL>
<h3>Preconditions</h3>
<UL>
<LI>
<tt>[first1, last1)</tt> is a valid range.
<LI>
<tt>[first2, first2 + (last2 - last1))</tt> is a valid range.
</UL>
<h3>Complexity</h3>
Linear. At most <tt>last1 - first1</tt> comparisons.
<h3>Example</h3>
<pre>
int A1[] = { 3, 1, 4, 1, 5, 9, 3 };
int A2[] = { 3, 1, 4, 2, 8, 5, 7 };
const int N = sizeof(A1) / sizeof(int);
<A href="pair.html">pair</A><int*, int*> result = mismatch(A1, A1 + N, A2);
cout << "The first mismatch is in position " << result.first - A1 << endl;
cout << "Values are: " << *(result.first) << ", " << *(result.second) << endl;
</pre>
<h3>Notes</h3>
<h3>See also</h3>
<tt><A href="equal.html">equal</A></tt>, <tt><A href="search.html">search</A></tt>, <tt><A href="find.html">find</A></tt>, <tt><A href="find_if.html">find_if</A></tt>
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