Mega Code Archive
Use custom function and sort to sort strings by length
<![CDATA[
/* 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;
bool lessLength (const string& s1, const string& s2)
{
return s1.length() < s2.length();
}
int main()
{
vector<string> coll1;
vector<string> coll2;
// fill both collections with the same elements
coll1.push_back ("1xxx");
coll1.push_back ("2x");
coll1.push_back ("3x");
coll1.push_back ("4x");
coll1.push_back ("5xx");
coll1.push_back ("6xxxx");
coll1.push_back ("7xx");
coll1.push_back ("8xxx");
coll1.push_back ("9xx");
coll1.push_back ("10xxx");
coll1.push_back ("11");
coll1.push_back ("12");
coll1.push_back ("13");
coll1.push_back ("14xx");
coll1.push_back ("15");
coll1.push_back ("16");
coll1.push_back ("17");
coll2 = coll1;
PRINT_ELEMENTS(coll1,"on entry:\n ");
// sort (according to the length of the strings)
sort (coll1.begin(), coll1.end(), // range
lessLength); // criterion
stable_sort (coll2.begin(), coll2.end(), // range
lessLength); // criterion
PRINT_ELEMENTS(coll1,"\nwith sort():\n ");
PRINT_ELEMENTS(coll2,"\nwith stable_sort():\n ");
}
on entry:
1xxx 2x 3x 4x 5xx 6xxxx 7xx 8xxx 9xx 10xxx 11 12 13 14xx 15 16 17
with sort():
17 2x 3x 4x 16 15 13 12 11 9xx 7xx 5xx 8xxx 14xx 1xxx 10xxx 6xxxx
with stable_sort():
2x 3x 4x 11 12 13 15 16 17 5xx 7xx 9xx 1xxx 8xxx 14xx 6xxxx 10xxx
]]>