inplace_merge (STL Samples)
Illustrates how to use the inplace_merge Standard Template Library (STL) function in Visual C++.
template<class BidirectionalIterator>
inline void inplace_merge(
BidirectionalIterator First,
BidirectionalIterator Middle,
BidirectionalIterator Last
)
Remarks
Note
The class/parameter names in the prototype do not match the version in the header file. Some have been modified to improve readability.
The inplace_merge algorithm merges two sorted subsequences: [First..Middle) and [Middle..Last) in place into a single sorted sequence [First..Last). This version assumes that the ranges [First..Middle) and [Middle..Last) are sorted using operator<. If both ranges contain equal values, the value from the first range will be stored first.
Example
// inplace_merge.cpp
// compile with: /EHsc
//
// Functions:
// inplace_merge : Merge two sorted sub-sequences in place into a
// single sorted list.
//
// begin - Returns an iterator that points to the first element in a
// sequence.
//
// end - Returns an iterator that points one past the end of a sequence.
//////////////////////////////////////////////////////////////////////
// disable warning C4786: symbol greater than 255 characters
// okay to ignore
#pragma warning(disable: 4786)
#include <iostream>
#include <algorithm>
#include <functional>
#include <vector>
using namespace std;
int main()
{
const int VECTOR_SIZE = 8 ;
// Define a template class vector of int
typedef vector<int > IntVector ;
//Define an iterator for template class vector of strings
typedef IntVector::iterator IntVectorIt ;
IntVector Numbers(VECTOR_SIZE) ;
IntVectorIt start, end, it ;
// Initialize vector Numbers
Numbers[0] = 4 ;
Numbers[1] = 10;
Numbers[2] = 70 ;
Numbers[3] = 10 ;
Numbers[4] = 30 ;
Numbers[5] = 69 ;
Numbers[6] = 96 ;
Numbers[7] = 100;
start = Numbers.begin() ; // location of first
// element of Numbers
end = Numbers.end() ; // one past the location
// last element of Numbers
cout << "Before calling inplace_merge\n" << endl ;
// print content of Numbers
cout << "Numbers { " ;
for(it = start; it != end; it++)
cout << *it << " " ;
cout << " }\n" << endl ;
//merge the elements of Numbers in place
inplace_merge(start, start + 3, end) ;
cout << "After calling inplace_merge\n" << endl ;
// print content of Numbers
cout << "Numbers { " ;
for(it = start; it != end; it++)
cout << *it << " " ;
cout << " }\n" << endl ;
}
Output
Before calling inplace_merge
Numbers { 4 10 70 10 30 69 96 100 }
After calling inplace_merge
Numbers { 4 10 10 30 69 70 96 100 }
Requirements
Header: <algorithm>