Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
529 views
in Technique[技术] by (71.8m points)

c++ - How do you insert with a reverse_iterator

I want to insert something into a STL list in C++, but I only have a reverse iterator. What is the usual way to accomplish this?

This works: (of course it does)

std::list<int> l;
std::list<int>::iterator forward = l.begin();
l.insert(forward, 5);

This doesn't work: (what should I do instead?)

std::list<int> l;
std::list<int>::reverse_iterator reverse = l.rbegin();
l.insert(reverse, 10);
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

l.insert(reverse.base(), 10); will insert '10' at the end, given your definition of the 'reverse' iterator. Actually, l.rbegin().base() == l.end().


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...