Mega Code Archive
Use sorting criterion in sort 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;
void printCollection (const list<int>& l)
{
PRINT_ELEMENTS(l);
}
bool lessForCollection (const list<int>& l1, const list<int>& l2)
{
return lexicographical_compare
(l1.begin(), l1.end(), // first range
l2.begin(), l2.end()); // second range
}
int main()
{
list<int> c1, c2, c3, c4;
// fill all collections with the same starting values
INSERT_ELEMENTS(c1,1,5);
c4 = c3 = c2 = c1;
// and now some differences
c1.push_back(7);
c3.push_back(2);
c3.push_back(0);
c4.push_back(2);
// create collection of collections
vector<list<int> > cc;
cc.push_back(c1);
cc.push_back(c2);
cc.push_back(c3);
cc.push_back(c4);
cc.push_back(c3);
cc.push_back(c1);
cc.push_back(c4);
cc.push_back(c2);
// print all collections
for_each (cc.begin(), cc.end(),
printCollection);
cout << endl;
// sort collection lexicographically
sort (cc.begin(), cc.end(), // range
lessForCollection); // sorting criterion
// print all collections again
for_each (cc.begin(), cc.end(),
printCollection);
}
/*
1 2 3 4 5 7
1 2 3 4 5
1 2 3 4 5 2 0
1 2 3 4 5 2
1 2 3 4 5 2 0
1 2 3 4 5 7
1 2 3 4 5 2
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5 2
1 2 3 4 5 2
1 2 3 4 5 2 0
1 2 3 4 5 2 0
1 2 3 4 5 7
1 2 3 4 5 7
*/
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