C++ 列表迭代器算法

Question

我知道您不能将迭代器与 "it +n" 形式的列表一起使用，但为什么当我使用 ++it 时程序能够编译，即：

//program compiles
list<int> v {1,2,3,4}; 
auto begin = v.begin(),
end = v.end(); 
while (begin != end) {
    ++begin;  
    begin = v.insert(begin, 42); 
    ++begin;  // advance begin past the element we just added
}

//program doesn't compile
list<int> v{1,2,3,4}; 
auto begin = v.begin(),
end = v.end(); 
while (begin != end) {
    begin+=1; //or alternatively begin = begin +1 
    begin = v.insert(begin, 42);  // insert the new value
    ++begin;  // advance begin past the element we just added
}

Answer 1

根据标准 std::list 实现没有“+=”运算符的双向迭代器 http://www.cplusplus.com/reference/iterator/BidirectionalIterator/

C++ 列表迭代器算法

C++ list iterator arithmetic

c++

containers

iterator

arithmetic-expressions

c++11