C++ Codes
Algorithms
Algorithm Analysis in C++
Beginners
Code Snippets
Graphics
Data Structures
File Manipulation
Games
Mathematics
Miscellaneous
Visual C++ Library
C++ > Visual C++ 5.0 Standard C++ Library sample source codes
The partition algorithm arranges elements in the range [first, last) such that
The partition algorithm arranges elements in the range [first, last) such that partition Header <algorithm> template<class BidirectionalIterator, class Predicate> inline BidirectionalIterator partition(BidirectionalIterator first, BidirectionalIterator last, Predicate predicate) The partition algorithm arranges elements in the range [first, last) such that the elements for which predicate returns true are before the elements for which predicate returns false. The algorithm returns an iterator positioned at the first element for which predicate returns false. Sample // disable warning C4786: symbol greater than 255 character, // okay to ignore #pragma warning(disable: 4786) #include <iostream> #include <vector> #include <algorithm> #include <functional> using namespace std; void main() { const int VECTOR_SIZE = 8 ; // Define a template class vector of integers typedef vector<int > IntVector ; //Define an iterator for template class vector of integer typedef IntVector::iterator IntVectorIt ; IntVector Numbers(VECTOR_SIZE) ; //vector containing numbers IntVectorIt start, end, it ; start = Numbers.begin() ; // location of first // element of Numbers end = Numbers.end() ; // one past the location // last element of Numbers //Initialize vector Numbers Numbers[0] = 6 ; Numbers[1] = 20 ; Numbers[2] = 10 ; Numbers[3] = 15 ; Numbers[4] = 12 ; Numbers[5] = 7 ; Numbers[6] = 9 ; Numbers[7] = 10 ; cout << "Before calling partition" << endl ; // print content of Numbers cout << "Numbers { " ; for(it = start; it != end; it++) cout << *it << " " ; cout << " }\n" << endl ; // partition the sequence such that all the elements // less than 11 appear before all the elements greater than 11 it = partition(start, end, bind2nd(less<int>(), 11)) ; cout << "After calling partition" << endl ; // print content of Numbers cout << "Numbers { " ; for(it = start; it != end; it++) cout << *it << " " ; cout << " }\n" << endl ; } Program Output Before calling partition Numbers { 6 20 10 15 12 7 9 10 } After calling partition Numbers { 6 10 10 9 7 12 15 20 }
Privacy Policy
|
Link to Us
|
Links