[英]C++ list iterator arithmetic
我知道您不能以“ it + n”的形式使用帶列表的迭代器,但是為什么當我使用++ it時程序可以編譯,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
}
根據standart std :: list實現的雙向迭代器http://www.cplusplus.com/reference/iterator/BidirectionalIterator/沒有“ + =”運算符
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.