C＆＃x2B;＆＃x2B; 20无法满足范围的约束:: remove_if（）
我有以下类：
template<typename T>
class Node {
private:
T item_;
public:
T Item() const {return item_;}
Node(T item) : item_(item) {}
Node<T>& operator=(T item) { item_ = item; return *this;}
Node<T>& operator=(Node<T> &rhs) { item_ = rhs.Item(); return *this;}
};
我尝试从具有值＆lt; 0。
vector<Node<int>> nodes(10);
ranges::generate(nodes, [n = -5]() mutable {return n++; });
nodes.erase(ranges::remove_if(nodes, [](const Node<int>& n) { return n.Item() < 0; }).begin(), nodes.end());
但是，我不断收到编译错误：
1>C:\Projects\C++\MyProject\MyProject\MyProject.cpp(8698,22): error C2672: 'operator __surrogate_func': no matching overloaded function found
1>C:\Projects\C++\MyProject\MyProject\MyProject.cpp(8698,86): error C7602: 'std::ranges::_Remove_if_fn::operator ()': the associated constraints are not satisfied
即使我尝试使用remove_if Overload使用＆amp; node＆lt; int＆gt; :: item投影。
任何建议和见识都将不胜感激。
I have the following class:
template<typename T>
class Node {
private:
T item_;
public:
T Item() const {return item_;}
Node(T item) : item_(item) {}
Node<T>& operator=(T item) { item_ = item; return *this;}
Node<T>& operator=(Node<T> &rhs) { item_ = rhs.Item(); return *this;}
};
And I try to erase nodes object from vector which have values < 0.
vector<Node<int>> nodes(10);
ranges::generate(nodes, [n = -5]() mutable {return n++; });
nodes.erase(ranges::remove_if(nodes, [](const Node<int>& n) { return n.Item() < 0; }).begin(), nodes.end());
However, I keep getting compilation error:
1>C:\Projects\C++\MyProject\MyProject\MyProject.cpp(8698,22): error C2672: 'operator __surrogate_func': no matching overloaded function found
1>C:\Projects\C++\MyProject\MyProject\MyProject.cpp(8698,86): error C7602: 'std::ranges::_Remove_if_fn::operator ()': the associated constraints are not satisfied
It happens even if I try to use the remove_if overload with &Node<int>::Item projection.
Any advice and insight is appreciated.
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在添加以下
=操作员过载之后，它起作用：我想知道为什么原始
=操作员与RHS参考引用不起作用？It works after adding the following
=operator overload:I wonder why the original
=operator overload withrhsreference doesn't work?