如果增加一个等于 STL 容器的结束迭代器的迭代器会发生什么

I've tested both of them with VC++ 7 for the edge case when the iterator points onto the last element of the STL container or beyond:

vector<int> vec;
vec.push_back( 1 );
vec.push_back( 2 );

vector<int>::iterator it = vec.begin();
advance( it, 2 );
bool isAtEnd = it == vec.end(); // true
it++; // or advance( it, 1 ); - doesn't matter
isAtEnd = it == vec.end(); //false
it = vec.begin();
advance( it, 3 );
isAtEnd = it == vec.end(); // false

在遍历 vector 和其他容器时，我可能多次看到建议与 vector::end() 进行比较:

for( vector<int>::iterator it = vec.begin(); it != vec.end(); it++ ) {
    //manipulate the element through the iterator here
}