C++/STL Algorithms Non modifying sequence operations/search — различия между версиями
Admin (обсуждение | вклад) м (1 версия: Импорт контента...) |
|
(нет различий)
| |
Версия 14:21, 25 мая 2010
Search first occurrence
/* 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()
{
deque<int> coll;
list<int> subcoll;
INSERT_ELEMENTS(coll,1,7);
INSERT_ELEMENTS(coll,1,7);
INSERT_ELEMENTS(subcoll,3,6);
PRINT_ELEMENTS(coll, "coll: ");
PRINT_ELEMENTS(subcoll,"subcoll: ");
// search first occurrence of subcoll in coll
deque<int>::iterator pos;
pos = search (coll.begin(), coll.end(), // range
subcoll.begin(), subcoll.end()); // subrange
// loop while subcoll found as subrange of coll
while (pos != coll.end()) {
// print position of first element
cout << "subcoll found starting with element "
<< distance(coll.begin(),pos) + 1
<< endl;
// search next occurrence of subcoll
++pos;
pos = search (pos, coll.end(), // range
subcoll.begin(), subcoll.end()); // subrange
}
}
/*
coll: 1 2 3 4 5 6 7 1 2 3 4 5 6 7
subcoll: 3 4 5 6
subcoll found starting with element 3
subcoll found starting with element 10
*/
Search first subrange
/* 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;
// checks whether an element is even or odd
bool checkEven (int elem, bool even)
{
if (even) {
return elem 2 == 0;
}
else {
return elem 2 == 1;
}
}
int main()
{
vector<int> coll;
INSERT_ELEMENTS(coll,1,9);
PRINT_ELEMENTS(coll,"coll: ");
/* arguments for checkEven()
* - check for: ""even odd even""
*/
bool checkEvenArgs[3] = { true, false, true };
// search first subrange in coll
vector<int>::iterator pos;
pos = search (coll.begin(), coll.end(), // range
checkEvenArgs, checkEvenArgs+3, // subrange values
checkEven); // subrange criterion
// loop while subrange found
while (pos != coll.end()) {
// print position of first element
cout << "subrange found starting with element "
<< distance(coll.begin(),pos) + 1
<< endl;
// search next subrange in coll
pos = search (++pos, coll.end(), // range
checkEvenArgs, checkEvenArgs+3, // subr. values
checkEven); // subr. criterion
}
}
/*
coll: 1 2 3 4 5 6 7 8 9
subrange found starting with element 2
subrange found starting with element 4
subrange found starting with element 6
*/