operator== (<iterator>)
測試,如果左側的 Iterator 物件等於右邊的 Iterator 物件。
template<class RandomIterator1, class RandomIterator2>
bool operator==(
const move_iterator<RandomIterator1>& _Left,
const move_iterator<RandomIterator2>& _Right
);
template<class RandomIterator1, class RandomIterator2>
bool operator==(
const reverse_iterator<RandomIterator1>& _Left,
const reverse_iterator<RandomIterator2>& _Right
);
template<class Type, class CharType, class Traits, class Distance>
bool operator==(
const istream_iterator<Type, CharType, Traits, Distance>& _Left,
const istream_iterator<Type, CharType, Traits, Distance>& _Right
);
template<class CharType, class Tr>
bool operator==(
const istreambuf_iterator<CharType, Traits>& _Left,
const istreambuf_iterator<CharType, Traits>& _Right
);
參數
_Left
型別之物件。_Right
型別之物件。
傳回值
true ,如果Iterator物件, false Iterator,如果物件不相等。
備註
如果設法解決問題,在容器的相同項目 Iterator 物件等於另一個。 如果兩個 Iterator 指向在容器中的不同項目,則不相等。
,只有在 _Left 和 _Right 儲存相同的Iterator,最後兩個範本運算子傳回true。 ,只有在 _Left 和 _Right 儲存資料流指標,第三個範本運算子傳回true。 第四個範本運算子傳回 _Left.equal (_Right)。
範例
// iterator_op_eq.cpp
// compile with: /EHsc
#include <iterator>
#include <vector>
#include <iostream>
int main( )
{
using namespace std;
int i;
vector<int> vec;
for ( i = 1 ; i < 6 ; ++i )
{
vec.push_back ( 2 * i );
}
vector <int>::iterator vIter;
cout << "The vector vec is: ( ";
for ( vIter = vec.begin( ) ; vIter != vec.end( ); vIter++)
cout << *vIter << " ";
cout << ")." << endl;
// Initializing reverse_iterators to the last element
vector <int>::reverse_iterator rVPOS1 = vec.rbegin ( ),
rVPOS2 = vec.rbegin ( );
cout << "The iterator rVPOS1 initially points to the first "
<< "element\n in the reversed sequence: "
<< *rVPOS1 << "." << endl;
if ( rVPOS1 == rVPOS2 )
cout << "The iterators are equal." << endl;
else
cout << "The iterators are not equal." << endl;
rVPOS1++;
cout << "The iterator rVPOS1 now points to the second "
<< "element\n in the reversed sequence: "
<< *rVPOS1 << "." << endl;
if ( rVPOS1 == rVPOS2 )
cout << "The iterators are equal." << endl;
else
cout << "The iterators are not equal." << endl;
}
需求
標題: <iterator>
命名空間: std