C++ 如何将 list<T> 对象附加到另一个对象
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how to append a list<T> object to another
提问by BCS
in C++, I have two list<T>objects Aand Band I want to add all the members of Bto the end of A. I've searched a few different sources and haven't found a simple solution (e.i. A.append(B);) and this surprises me a bit.
在 C++ 中，我有两个list<T>对象A，B我想将 的所有成员添加B到A. 我搜索了几个不同的来源，但没有找到一个简单的解决方案 (ei A.append(B);)，这让我有点惊讶。
What is the best way to do this?
做这个的最好方式是什么？
As it happens, I don't care about B after this (it gets deleted in the very next line) so if there is a way to leverage that for better perf I'm also interested in that.
碰巧的是，在这之后我不关心 B（它在下一行被删除）所以如果有办法利用它来获得更好的性能，我也对此感兴趣。
回答by UncleBens
If you want to append copies of itemsin B, you can do:
如果要在 B 中附加项目的副本，可以执行以下操作：
a.insert(a.end(), b.begin(), b.end());
If you want to move itemsof B to the end of A (emptying B at the same time), you can do:
如果要将B 的项目移动到 A 的末尾（同时清空 B），可以执行以下操作：
a.splice(a.end(), b);
In your situation splicing would be better, since it just involves adjusting a couple of pointers in the linked lists.
在你的情况下拼接会更好，因为它只涉及调整链表中的几个指针。
回答by serup
one example using boost
一个使用 boost 的例子
std::list<T> A; // object A is a list containing T structure
std::list<T> B; // object B is a list containing T structure
// append list B to list A
BOOST_FOREACH(auto &listElement, B) { A.push_back( listElement ); }
