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最近想用优先级队列解决进队列的结构体按等级排序并出列的需求,但是总是报错
是重写的排序function报错,我的代码是这样的
struct Model
{
int a = 6;
Model(int a_):a(a_){}
};
struct Node {
int priority_;
Model data_;
Node(int pri, Model data):priority(pri, data){}
};
class complex {
public:
bool operator()(const Node& s1, const Node& s2)
{
return s1.priority_ >= s2.priority_;
}
};
class custom_priority_queue : public std::priority_queue<Node, std::vector<Node>, complex>
{
public:
bool midRemove(const QString& value) {
for(auto it = this->c.begin(); it != this->c.end(); it++)
{
if(it->data_.a == value)
{
this->c.erase(it);
std::sort_heap(this->c.begin(), this->c.end(), this->comp);
return true;
}
}
return false;
}
};
int main()
{
custom_priority_queue queue_;
queue.push(Node(1, Model(2)));
queue.push(Node(9, Model(2)));
queue.push(Node(4, Model(2)));
queue.push(Node(2, Model(2)));
queue.push(Node(7, Model(2)));
queue.push(Node(1, Model(2)));
queue.push(Node(2, Model(2)));
while (!queue_.empty())
{
std::cout << queue_.top().priority_ << " ";
queue_.pop();
}
经查下面重写比较器的时候,要遵循结果对称。例如complex(1,2) 如果是true,那么complex(2,1)就必须式false,或者同为false。
上面的写法中:error
complex(1,1)为true
complex(1,1)为true
修改为下面的写法后:
complex(1,1)为false
complex(1,1)为false
before:
class complex {
public:
bool operator()(const Node& s1, const Node& s2)
{
return s1.priority_ >= s2.priority_;
}
};
after:
class complex {
public:
bool operator()(const Node& s1, const Node& s2)
{
if (s1.priority_ > s2.priority_)
return true;
return false;
}
};
本文标签: 报错priorityqueuestdcomparatorInvalid
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