Mega Code Archive
Use mismatch function with custom function
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/* 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
*/
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