[英]C++ list iterator arithmetic
我知道您不能以“ it + n”的形式使用带列表的迭代器,但是为什么当我使用++ it时程序可以编译,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
}
根据standart std :: list实现的双向迭代器http://www.cplusplus.com/reference/iterator/BidirectionalIterator/没有“ + =”运算符
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