本文介绍了从 C++ std::vector 中删除元素的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!
问题描述
在迭代过程中从 C++ 向量中删除元素的正确方法是什么?我正在迭代一个数组并想删除一些匹配特定条件的元素.有人告诉我,在遍历期间修改它是一件坏事.
What is the proper way to remove elements from a C++ vector while iterating through it? I am iterating over an array and want to remove some elements that match a certain condition. I've been told that it's a bad thing to modify it during traversal.
我想我还应该提到这是一个指针数组,我需要在删除它们之前释放它们.
I guess I should also mention that this is an array of pointers that I need to free before removing them.
这是我的代码片段.
void RoutingProtocolImpl::removeAllInfinity()
{
dv.erase(std::remove_if(dv.begin(), dv.end(), hasInfCost), dv.end());
}
bool RoutingProtocolImpl::hasInfCost(RoutingProtocolImpl::dv_entry *entry)
{
if (entry->link_cost == INFINITY_COST)
{
free(entry);
return true;
}
else
{
return false;
}
}
编译时出现以下错误:
RoutingProtocolImpl.cc:368: error: argument of type bool (RoutingProtocolImpl::)(RoutingProtocolImpl::dv_entry*)' does not match
bool (RoutingProtocolImpl::)(RoutingProtocolImpl::dv_entry)'
抱歉,我是 C++ 新手.
Sorry, I'm kind of a C++ newb.
推荐答案
bool IsEven (int i)
{
return (i%2) == 0;
}
//...
std::vector<int> v;
v.push_back(1);
v.push_back(2);
v.push_back(3);
v.push_back(4);
v.erase(std::remove_if(v.begin(),v.end(),IsEven), v.end());
//v now contains 1 and 3
这篇关于从 C++ std::vector 中删除元素的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!
本站部分内容来源互联网,如果有图片或者内容侵犯了您的权益,请联系我们,我们会在确认后第一时间进行删除!