如何将 std::queue 转换为 std::vector [英] How to convert std::queue to std::vector
问题描述
我需要使用双打队列，因为它作为有序容器具有良好的属性.我想将此队列传递给接受向量的类构造函数.如果我直接这样做，我会收到以下错误:
I need to make use of a queue of doubles because of the good properties it has as an ordered container. I want to pass this queue to a class constructor that accepts vectors. If I do that directly I get the following error:
候选构造函数不可行:没有已知的转换来自'std::queue' 到 'std::vector &'对于第二个参数
candidate constructor not viable: no known conversion from 'std::queue' to 'std::vector &' for 2nd argument
如何将队列转换为向量?
How to cast a queue to a vector?
推荐答案
模拟 queue_like 行为和 vector-like 行为的正确容器是 std::deque.
The correct container to model both queue_like behaviour and vector-like behaviour is a std::deque.
这样做的优点是:
在双端队列两端的恒定时间插入和删除
constant-time insertion and deletion at either end of the deque
能够在不破坏双端队列的情况下迭代元素
ability to iterate elements without destroying the deque
std::deque 支持 begin() 和 end() 方法，这意味着您可以构造一个向量(具有兼容的值-直接输入).
std::deque supports the begin() and end() methods which means you can construct a vector (with compatible value-type) directly.
#include <vector>
#include <deque>
class AcceptsVectors
{
public:
AcceptsVectors(std::vector<double> arg);
};
int main()
{
std::deque<double> myqueue;
auto av = AcceptsVectors({myqueue.begin(), myqueue.end()});
}
queue 到 vector 的非变异转换是不可能的.
A non-mutating conversion of a queue to a vector is not possible.
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