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==Check for mismatch between two vectors==

<source lang="cpp">

#include <iostream>
using std::cout;
using std::endl;
#include <algorithm>
#include <vector>
#include <iterator>
int main()
{
int a1[ 10 ] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
int a2[ 10 ] = { 1, 2, 3, 4, 9, 6, 7, 8, 9, 10 };
std::vector< int > v1( a1, a1 + 10 );
std::vector< int > v2( a1, a1 + 10 );
std::vector< int > v3( a2, a2 + 10 );
std::ostream_iterator< int > output( cout, " " );
cout << "Vector v1 contains: ";
std::copy( v1.begin(), v1.end(), output );
cout << "\nVector v2 contains: ";
std::copy( v2.begin(), v2.end(), output );
cout << "\nVector v3 contains: ";
std::copy( v3.begin(), v3.end(), output );
std::pair< std::vector< int >::iterator, std::vector< int >::iterator > loca
tion;
location = std::mismatch( v1.begin(), v1.end(), v3.begin() );
cout << "\nThere is a mismatch between v1 and v3 at location "
<< ( location.first - v1.begin() ) << "\nwhere v1 contains "
<< *location.first << " and v3 contains " << *location.second;
return 0;
}
/*
Vector v1 contains: 1 2 3 4 5 6 7 8 9 10
Vector v2 contains: 1 2 3 4 5 6 7 8 9 10
Vector v3 contains: 1 2 3 4 9 6 7 8 9 10
There is a mismatch between v1 and v3 at location 4
where v1 contains 5 and v3 contains 9
*/

</source>

==Generic mismatch algorithm: Find the corresponding positions in a deque and list at which unequal elements first occur==

<source lang="cpp">

#include <iostream>
#include <cassert>
#include <algorithm>
#include <string>
#include <list>
#include <deque>
#include <vector>
using namespace std;
int main()
{
list<string> driver_list;
vector<string> vec;
deque<string> deq;
driver_list.insert(driver_list.end(), "AAA");
driver_list.insert(driver_list.end(), "BBBB");
driver_list.insert(driver_list.end(), "CCCCC");
deq.insert(deq.end(), "AAA");
deq.insert(deq.end(), "DDDDDD");

pair<deque<string>::iterator, list<string>::iterator> pair1 = mismatch(deq.begin(), deq.end(),driver_list.begin());
if (pair1.first != deq.end())
cout << "First disagreement in deq and driver_list:\n "
<< *(pair1.first) << " and " << *(pair1.second)
<< endl;
return 0;
}
/*
First disagreement in deq and driver_list:
DDDDDD and BBBB
*/
</source>

==Use mismatch function to find the first match==

<source lang="cpp">

/* The following code example is taken from the book
* "The C++ Standard Library - A Tutorial and Reference"
* by Nicolai M. Josuttis, Addison-Wesley, 1999
*
* (C) Copyright Nicolai M. Josuttis 1999.
* Permission to copy, use, modify, sell and distribute this software
* is granted provided this copyright notice appears in all copies.
* This software is provided "as is" without express or implied
* warranty, and with no claim as to its suitability for any purpose.
*/
#include <iostream>
#include <vector>
#include <deque>
#include <list>
#include <set>
#include <map>
#include <string>
#include <algorithm>
#include <iterator>
#include <functional>
#include <numeric>
/* PRINT_ELEMENTS()
* - prints optional C-string optcstr followed by
* - all elements of the collection coll
* - separated by spaces
*/
template <class T>
inline void PRINT_ELEMENTS (const T& coll, const char* optcstr="")
{
typename T::const_iterator pos;
std::cout << optcstr;
for (pos=coll.begin(); pos!=coll.end(); ++pos) {
std::cout << *pos << " ";
}
std::cout << std::endl;
}
/* INSERT_ELEMENTS (collection, first, last)
* - fill values from first to last into the collection
* - NOTE: NO half-open range
*/
template <class T>
inline void INSERT_ELEMENTS (T& coll, int first, int last)
{
for (int i=first; i<=last; ++i) {
coll.insert(coll.end(),i);
}
}
using namespace std;
int main()
{
vector<int> coll1;
list<int> coll2;
INSERT_ELEMENTS(coll1,1,6);
for (int i=1; i<=16; i*=2) {
coll2.push_back(i);
}
coll2.push_back(3);
PRINT_ELEMENTS(coll1,"coll1: ");
PRINT_ELEMENTS(coll2,"coll2: ");
// find first mismatch
pair<vector<int>::iterator,list<int>::iterator> values;
values = mismatch (coll1.begin(), coll1.end(), // first range
coll2.begin()); // second range
if (values.first == coll1.end()) {
cout << "no mismatch" << endl;
}
else {
cout << "first mismatch: "
<< *values.first << " and "
<< *values.second << endl;
}
}
/*
coll1: 1 2 3 4 5 6
coll2: 1 2 4 8 16 3
first mismatch: 3 and 4
*/
</source>

==Use mismatch function with custom function==

<source lang="cpp">

/* The following code example is taken from the book
* "The C++ Standard Library - A Tutorial and Reference"
* by Nicolai M. Josuttis, Addison-Wesley, 1999
*
* (C) Copyright Nicolai M. Josuttis 1999.
* Permission to copy, use, modify, sell and distribute this software
* is granted provided this copyright notice appears in all copies.
* This software is provided "as is" without express or implied
* warranty, and with no claim as to its suitability for any purpose.
*/
#include <iostream>
#include <vector>
#include <deque>
#include <list>
#include <set>
#include <map>
#include <string>
#include <algorithm>
#include <iterator>
#include <functional>
#include <numeric>
/* PRINT_ELEMENTS()
* - prints optional C-string optcstr followed by
* - all elements of the collection coll
* - separated by spaces
*/
template <class T>
inline void PRINT_ELEMENTS (const T& coll, const char* optcstr="")
{
typename T::const_iterator pos;
std::cout << optcstr;
for (pos=coll.begin(); pos!=coll.end(); ++pos) {
std::cout << *pos << " ";
}
std::cout << std::endl;
}
/* INSERT_ELEMENTS (collection, first, last)
* - fill values from first to last into the collection
* - NOTE: NO half-open range
*/
template <class T>
inline void INSERT_ELEMENTS (T& coll, int first, int last)
{
for (int i=first; i<=last; ++i) {
coll.insert(coll.end(),i);
}
}
using namespace std;
int main()
{
vector<int> coll1;
list<int> coll2;
INSERT_ELEMENTS(coll1,1,6);
for (int i=1; i<=16; i*=2) {
coll2.push_back(i);
}
coll2.push_back(3);
PRINT_ELEMENTS(coll1,"coll1: ");
PRINT_ELEMENTS(coll2,"coll2: ");
// find first mismatch
pair<vector<int>::iterator,list<int>::iterator> values;
/* find first position where the element of coll1 is not
* less than the corresponding element of coll2
*/
values = mismatch (coll1.begin(), coll1.end(), // first range
coll2.begin(), // second range
less_equal<int>()); // criterion
if (values.first == coll1.end()) {
cout << "always less-or-equal" << endl;
}
else {
cout << "not less-or-equal: "
<< *values.first << " and "
<< *values.second << endl;
}
}
/*
coll1: 1 2 3 4 5 6
coll2: 1 2 4 8 16 3
not less-or-equal: 6 and 3
*/
</source>

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