如何有效清除std :: queue? [英] How do I clear the std::queue efficiently?
问题描述
我正在使用std :: queue来实现JobQueue类。 (基本上,此类以FIFO方式处理每个作业)。
在一种情况下,我想一枪清除队列(从队列中删除所有作业)。
我在std :: queue类中看不到任何清除方法。
I am using std::queue for implementing JobQueue class. ( Basically this class process each job in FIFO manner). In one scenario, I want to clear the queue in one shot( delete all jobs from the queue). I don't see any clear method available in std::queue class.
如何有效地为JobQueue类实现清除方法?
How do I efficiently implement the clear method for JobQueue class ?
我有一个简单的循环弹出解决方案,但我正在寻找更好的方法。
I have one simple solution of popping in a loop but I am looking for better ways.
//Clears the job queue
void JobQueue ::clearJobs()
{
// I want to avoid pop in a loop
while (!m_Queue.empty())
{
m_Queue.pop();
}
}
推荐答案
A清除标准容器的常见习惯是与容器的空版本交换:
A common idiom for clearing standard containers is swapping with an empty version of the container:
void clear( std::queue<int> &q )
{
std::queue<int> empty;
std::swap( q, empty );
}
这也是清除某些容器内存储的内存的唯一方法( std :: vector)
It is also the only way of actually clearing the memory held inside some containers (std::vector)
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