includes
Tests whether one sorted range contains all the elements contained in a second sorted range, where the ordering or equivalence criterion between elements may be specified by a binary predicate.
template<class InputIterator1, class InputIterator2>
bool includes(
InputIterator1 _First1,
InputIterator1 _Last1,
InputIterator2 _First2,
InputIterator2 _Last1
);
template<class InputIterator1, class InputIterator2, class BinaryPredicate>
bool includes(
InputIterator1 _First1,
InputIterator1 _Last1,
InputIterator2 _First2,
InputIterator2 _Last1,
BinaryPredicate _Comp
);
매개 변수
_First1
An input iterator addressing the position of the first element in the first of two sorted source ranges to be tested for whether all the elements of the second are contained in the first._Last1
An input iterator addressing the position one past the last element in the first of two sorted source ranges to be tested for whether all the elements of the second are contained in the first._First2
An input iterator addressing the position of the first element in second of two consecutive sorted source ranges to be tested for whether all the elements of the second are contained in the first._Last2
An input iterator addressing the position one past the last element in second of two consecutive sorted source ranges to be tested for whether all the elements of the second are contained in the first._Comp
한 요소가 다른 요소보다 작은 개념을 정의하는 사용자 정의 조건자 함수 개체입니다. 이진 조건자는 두 개의 인수를 사용하고 만족할 때는 true를 만족하지 못할 때는 false를 반환합니다.
반환 값
true if the first sorted range contains all the elements in the second sorted range; otherwise, false.
설명
Another way to think of this test is that it determined whether the second source range is a subset of the first source range.
The sorted source ranges referenced must be valid; all pointers must be dereferenceable and, within each sequence, the last position must be reachable from the first by incrementation.
The sorted source ranges must each be arranged as a precondition to the application of the algorithm includes in accordance with the same ordering as is to be used by the algorithm to sort the combined ranges.
The source ranges are not modified by the algorithm merge.
The value types of the input iterators need be less-than comparable to be ordered, so that, given two elements, it may be determined either that they are equivalent (in the sense that neither is less than the other) or that one is less than the other. 그러면 동일하지 않은 요소 사이에 정렬이 수행됩니다. More precisely, the algorithm tests whether all the elements in the first sorted range under a specified binary predicate have equivalent ordering to those in the second sorted range.
The complexity of the algorithm is linear with at most 2 * ( (_Last1 – _First1) – (_Last2 – _First2) ) – 1 comparisons for nonempty source ranges.
예제
// alg_includes.cpp
// compile with: /EHsc
#include <vector>
#include <algorithm>
#include <functional> // For greater<int>( )
#include <iostream>
// Return whether modulus of elem1 is less than modulus of elem2
bool mod_lesser (int elem1, int elem2 )
{
if ( elem1 < 0 )
elem1 = - elem1;
if ( elem2 < 0 )
elem2 = - elem2;
return elem1 < elem2;
}
int main( )
{
using namespace std;
vector <int> v1a, v1b;
vector <int>::iterator Iter1a, Iter1b;
// Constructing vectors v1a & v1b with default less-than ordering
int i;
for ( i = -2 ; i <= 4 ; i++ )
{
v1a.push_back( i );
}
int ii;
for ( ii =-2 ; ii <= 3 ; ii++ )
{
v1b.push_back( ii );
}
cout << "Original vector v1a with range sorted by the\n "
<< "binary predicate less than is v1a = ( " ;
for ( Iter1a = v1a.begin( ) ; Iter1a != v1a.end( ) ; Iter1a++ )
cout << *Iter1a << " ";
cout << ")." << endl;
cout << "Original vector v1b with range sorted by the\n "
<< "binary predicate less than is v1b = ( " ;
for ( Iter1b = v1b.begin ( ) ; Iter1b != v1b.end ( ) ; Iter1b++ )
cout << *Iter1b << " ";
cout << ")." << endl;
// Constructing vectors v2a & v2b with ranges sorted by greater
vector <int> v2a ( v1a ) , v2b ( v1b );
vector <int>::iterator Iter2a, Iter2b;
sort ( v2a.begin ( ) , v2a.end ( ) , greater<int> ( ) );
sort ( v2b.begin ( ) , v2b.end ( ) , greater<int> ( ) );
v2a.pop_back ( );
cout << "Original vector v2a with range sorted by the\n "
<< "binary predicate greater is v2a = ( " ;
for ( Iter2a = v2a.begin ( ) ; Iter2a != v2a.end ( ) ; Iter2a++ )
cout << *Iter2a << " ";
cout << ")." << endl;
cout << "Original vector v2b with range sorted by the\n "
<< "binary predicate greater is v2b = ( " ;
for ( Iter2b = v2b.begin ( ) ; Iter2b != v2b.end ( ) ; Iter2b++ )
cout << *Iter2b << " ";
cout << ")." << endl;
// Constructing vectors v3a & v3b with ranges sorted by mod_lesser
vector <int> v3a ( v1a ), v3b ( v1b ) ;
vector <int>::iterator Iter3a, Iter3b;
reverse (v3a.begin( ), v3a.end( ) );
v3a.pop_back ( );
v3a.pop_back ( );
sort ( v3a.begin ( ) , v3a.end ( ) , mod_lesser );
sort ( v3b.begin ( ) , v3b.end ( ) , mod_lesser );
cout << "Original vector v3a with range sorted by the\n "
<< "binary predicate mod_lesser is v3a = ( " ;
for ( Iter3a = v3a.begin ( ) ; Iter3a != v3a.end ( ) ; Iter3a++ )
cout << *Iter3a << " ";
cout << ")." << endl;
cout << "Original vector v3b with range sorted by the\n "
<< "binary predicate mod_lesser is v3b = ( " ;
for ( Iter3b = v3b.begin ( ) ; Iter3b != v3b.end ( ) ; Iter3b++ )
cout << *Iter3b << " ";
cout << ")." << endl;
// To test for inclusion under an asscending order
// with the default binary predicate less <int> ( )
bool Result1;
Result1 = includes ( v1a.begin ( ) , v1a.end ( ) ,
v1b.begin ( ) , v1b.end ( ) );
if ( Result1 )
cout << "All the elements in vector v1b are "
<< "contained in vector v1a." << endl;
else
cout << "At least one of the elements in vector v1b "
<< "is not contained in vector v1a." << endl;
// To test for inclusion under descending
// order specify binary predicate greater<int>( )
bool Result2;
Result2 = includes ( v2a.begin ( ) , v2a.end ( ) ,
v2b.begin ( ) , v2b.end ( ) , greater <int> ( ) );
if ( Result2 )
cout << "All the elements in vector v2b are "
<< "contained in vector v2a." << endl;
else
cout << "At least one of the elements in vector v2b "
<< "is not contained in vector v2a." << endl;
// To test for inclusion under a user
// defined binary predicate mod_lesser
bool Result3;
Result3 = includes ( v3a.begin ( ) , v3a.end ( ) ,
v3b.begin ( ) , v3b.end ( ) , mod_lesser );
if ( Result3 )
cout << "All the elements in vector v3b are "
<< "contained under mod_lesser in vector v3a."
<< endl;
else
cout << "At least one of the elements in vector v3b is "
<< " not contained under mod_lesser in vector v3a."
<< endl;
}
요구 사항
헤더: <algorithm>
네임스페이스: std