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  • C++ 需要从'；std：：pair<；标准：：_Rb_tree_迭代器<_Val>；，布尔>；标准：：_Rb_tree<_键、\u Val、\u KeyOfValue、\u Compare、\u Alloc>；：：_M_insert_unique

C++ 需要从'；std：：pair<；标准：：_Rb_tree_迭代器<_Val>；，布尔>；标准：：_Rb_tree<_键、\u Val、\u KeyOfValue、\u Compare、\u Alloc>；：：_M_insert_unique

c++ compiler-errors

C++ 需要从'；std：：pair<；标准：：_Rb_tree_迭代器<_Val>；，布尔>；标准：：_Rb_tree<_键、\u Val、\u KeyOfValue、\u Compare、\u Alloc>；：：_M_insert_unique,c++,compiler-errors,comparator,stdset,C++,Compiler Errors,Comparator,Stdset,我得到一个编译错误 required from 'std::pair<std::_Rb_tree_iterator<_Val>, bool> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique(_Arg&&) [with _Arg = Solution::EnhancedNode* const&; _Key = Solution::Enha

我得到一个编译错误

required from 'std::pair<std::_Rb_tree_iterator<_Val>, bool> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique(_Arg&&) [with _Arg = Solution::EnhancedNode* const&; _Key = Solution::EnhancedNode*; _Val = Solution::EnhancedNode*; _KeyOfValue = std::_Identity<Solution::EnhancedNode*>; _Compare = Solution::EnhancedNodeComparator; _Alloc = std::allocator<Solution::EnhancedNode*>]'
我是否做了任何明显错误的事情？

在创建一个最小、完整、可验证的TM示例时，我能够解决我的问题。不管怎样，我之所以发布它，是因为谷歌出人意料地在我的引用错误的第一部分中没有点击

原来我不需要中的
&
s

struct EnhancedNodeComparator {
    bool operator() (const EnhancedNode*& a, const EnhancedNode*& b) const {
我是在另一个编译器上编译的

#包括
#包括
使用名称空间std；
树状结构{
int-val；
TreeNode*左；
TreeNode*对；
树节点（intx）：val（x），左（nullptr），右（nullptr）{
};
类增强节点{
公众：
增强节点（树节点*节点）{
节点=节点；
距离=数值限制：：max（）；
丢弃=错误；
}
树节点*node_u2;；
双倍距离；
布尔；
};
结构增强子节点比较器{
布尔运算符（）（常量增强节点*&a，常量增强节点*&b）常量{
返回a->distance\ub->distance\ux；
}
};
int main（）
{
设置最接近的参数；
最近插入（新增强子节点（新TreeNode（1））；
返回0；
}
还有一个更有用的错误：

In file included from /usr/include/c++/4.9/set:60:0,
                 from 3:
/usr/include/c++/4.9/bits/stl_tree.h: In instantiation of 'std::pair<std::_Rb_tree_node_base*, std::_Rb_tree_node_base*> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_get_insert_unique_pos(const key_type&) [with _Key = EnhancedNode*; _Val = EnhancedNode*; _KeyOfValue = std::_Identity<EnhancedNode*>; _Compare = EnhancedNodeComparator; _Alloc = std::allocator<EnhancedNode*>; std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::key_type = EnhancedNode*]':
/usr/include/c++/4.9/bits/stl_tree.h:1498:47:   required from 'std::pair<std::_Rb_tree_iterator<_Val>, bool> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique(_Arg&&) [with _Arg = EnhancedNode*; _Key = EnhancedNode*; _Val = EnhancedNode*; _KeyOfValue = std::_Identity<EnhancedNode*>; _Compare = EnhancedNodeComparator; _Alloc = std::allocator<EnhancedNode*>]'
/usr/include/c++/4.9/bits/stl_set.h:511:40:   required from 'std::pair<typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator, bool> std::set<_Key, _Compare, _Alloc>::insert(std::set<_Key, _Compare, _Alloc>::value_type&&) [with _Key = EnhancedNode*; _Compare = EnhancedNodeComparator; _Alloc = std::allocator<EnhancedNode*>; typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator = std::_Rb_tree_const_iterator<EnhancedNode*>; std::set<_Key, _Compare, _Alloc>::value_type = EnhancedNode*]'
33:54:   required from here
/usr/include/c++/4.9/bits/stl_tree.h:1445:11: error: no match for call to '(EnhancedNodeComparator) (EnhancedNode* const&, EnhancedNode* const&)'
    __comp = _M_impl._M_key_compare(__k, _S_key(__x));
           ^
24:8: note: candidate is:
25:10: note: bool EnhancedNodeComparator::operator()(const EnhancedNode*&, const EnhancedNode*&) const
25:10: note:   no known conversion for argument 1 from 'const key_type {aka EnhancedNode* const}' to 'const EnhancedNode*&'
In file included from /usr/include/c++/4.9/set:60:0,
                 from 3:
/usr/include/c++/4.9/bits/stl_tree.h:1456:7: error: no match for call to '(EnhancedNodeComparator) (EnhancedNode* const&, EnhancedNode* const&)'
       if (_M_impl._M_key_compare(_S_key(__j._M_node), __k))
       ^
24:8: note: candidate is:
25:10: note: bool EnhancedNodeComparator::operator()(const EnhancedNode*&, const EnhancedNode*&) const
25:10: note:   no known conversion for argument 1 from 'EnhancedNode* const' to 'const EnhancedNode*&'
In file included from /usr/include/c++/4.9/set:60:0,
                 from 3:
/usr/include/c++/4.9/bits/stl_tree.h: In instantiation of 'std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_(std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_Base_ptr, std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_Base_ptr, _Arg&&) [with _Arg = EnhancedNode*; _Key = EnhancedNode*; _Val = EnhancedNode*; _KeyOfValue = std::_Identity<EnhancedNode*>; _Compare = EnhancedNodeComparator; _Alloc = std::allocator<EnhancedNode*>; std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator = std::_Rb_tree_iterator<EnhancedNode*>; std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_Base_ptr = std::_Rb_tree_node_base*]':
/usr/include/c++/4.9/bits/stl_tree.h:1502:38:   required from 'std::pair<std::_Rb_tree_iterator<_Val>, bool> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique(_Arg&&) [with _Arg = EnhancedNode*; _Key = EnhancedNode*; _Val = EnhancedNode*; _KeyOfValue = std::_Identity<EnhancedNode*>; _Compare = EnhancedNodeComparator; _Alloc = std::allocator<EnhancedNode*>]'
/usr/include/c++/4.9/bits/stl_set.h:511:40:   required from 'std::pair<typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator, bool> std::set<_Key, _Compare, _Alloc>::insert(std::set<_Key, _Compare, _Alloc>::value_type&&) [with _Key = EnhancedNode*; _Compare = EnhancedNodeComparator; _Alloc = std::allocator<EnhancedNode*>; typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator = std::_Rb_tree_const_iterator<EnhancedNode*>; std::set<_Key, _Compare, _Alloc>::value_type = EnhancedNode*]'
33:54:   required from here
/usr/include/c++/4.9/bits/stl_tree.h:1140:8: error: no match for call to '(EnhancedNodeComparator) (EnhancedNode*&, EnhancedNode* const&)'
        || _M_impl._M_key_compare(_KeyOfValue()(__v),
        ^
24:8: note: candidate is:
25:10: note: bool EnhancedNodeComparator::operator()(const EnhancedNode*&, const EnhancedNode*&) const
25:10: note:   no known conversion for argument 1 from 'EnhancedNode*' to 'const EnhancedNode*&'

在/usr/include/c++/4.9/set:60:0中包含的文件中，
从3开始：
/usr/include/c++/4.9/bits/stl_tree.h:在“std:：pair std:：_Rb_tree:：_M_get_insert_unique_pos（const key_type&）[带_key=EnhancedNode*；_Val=EnhancedNode*；_KeyOfValue=std:_Identity；_Compare=EnhancedNodeComparator；_Alloc=std:：Alloc=std:：分配器；std:_Rb_树：：key=EnhancedNode=EnhancedNode*]：
/usr/include/c++/4.9/bits/stl_tree.h:1498:47:std:：pair std:：_Rb_tree:：_M_insert_unique（_Arg&）[with _Arg=EnhancedNode*；_Key=EnhancedNode*；_Val=EnhancedNode*；_KeyOfValue=std:_Identity；_Compare=EnhancedNodeComparator；_Alloc=std:：分配器]'
/usr/include/c++/4.9/bits/stl_set.h:511:40:std：：pair std：：set：：insert（std：：set：：value_type&）[with _Key=EnhancedNode*；_Compare=EnhancedNodeComparator；_Alloc=std：：分配器；typename std:_rbtree：：const_迭代器=std:_rbtree\u const迭代器；std：：Rb tree：：set：：value_type=EnhancedNode
33:54：从这里开始需要
/usr/include/c++/4.9/bits/stl_tree.h:1445:11:错误：调用'（EnhancedNodeComparator）（EnhancedNode*const&，EnhancedNode*const&）时不匹配
__comp=_M_impl._M_key_compare（u k，_S_key（u x））；
^
24:8：注：候选人为：
25:10：注意：bool-EnhancedNodeComparator:：operator（）（const-EnhancedNode*&，const-EnhancedNode*&）const
25:10：注意：参数1从'const key_type{aka EnhancedNode*const}'到'const EnhancedNode*&'没有已知的转换
在/usr/include/c++/4.9/set:60:0中包含的文件中，
从3开始：
/usr/include/c++/4.9/bits/stl_tree.h:1456:7:错误：调用'（EnhancedNodeComparator）（EnhancedNode*const&，EnhancedNode*const&）不匹配
if（_M_impl._M_key_compare（_S_key（_j._M_node），__k））
^
24:8：注：候选人为：
25:10：注意：bool-EnhancedNodeComparator:：operator（）（const-EnhancedNode*&，const-EnhancedNode*&）const
25:10：注意：参数1从'EnhancedNode*const'到'const EnhancedNode*&'的转换未知
在/usr/include/c++/4.9/set:60:0中包含的文件中，
从3开始：
/usr/include/c++/4.9/bits/stl_tree.h:In'std:：_Rb_tree:：iterator std:：_Rb_tree:：_M_insert_（std:_Rb_tree:：_Base_ptr，std:_Rb_tree:：_Base_ptr，_Arg&）[with _Arg=EnhancedNode*；_Key=EnhancedNode*；_Val=EnhancedNode*；_KeyOfValue=std:：_Identity；_Compare=EnhancedNodeComparator；_Alloc=std:：分配器；std:_Rb_tree:：iterator=std:_Rb_tree_迭代器；std:_Rb_tree:：_Base_ptr=std:_Rb_tree_node*]：
/usr/include/c++/4.9/bits/stl_tree.h:1502:38:std:：pair std:_Rb_tree:：_M_insert_unique（_Arg&）[with _Arg=EnhancedNode*；_Key=EnhancedNode*；_Val=EnhancedNode*；_KeyOfValue=std:_Identity；_Compare=EnhancedNodeComparator；_Alloc=std:：Alloc]
/usr/include/c++/4.9/bits/stl_set.h:511:40:std：：pair std：：set：：insert（std：：set：：value_type&）[with _Key=EnhancedNode*；_Compare=EnhancedNodeComparator；_Alloc=std：：分配器；typename std:_rbtree：：const_迭代器=std:_rbtree\u const迭代器；std：：Rb tree：：set：：value_type=EnhancedNode
33:54：从这里开始需要
/usr/include/c++/4.9/bits/stl_tree.h:1140:8:错误：调用'（EnhancedNodeComparator）（EnhancedNode*&，EnhancedNode*const&）时不匹配
||_M_impl._M_key_compare（_KeyOfValue（）（_v）），
^
24:8：注：候选人为：
25:10：注意：bool-EnhancedNodeComparator:：operator（）（const-EnhancedNode*&，const-EnhancedNode*&）const
25:10：注意：参数1从'EnhancedNode*'到'const EnhancedNode*&'的转换未知
我真的不明白为什么会这样。我在网上找到的std:：set自定义比较器的所有示例似乎都添加了
&
。如果有人可以解释为答案，我会选择它作为完整答案。

在创建一个最小的、完整的、可验证的TM示例时，我能够解决我的问题。我之所以发布它，是因为令人惊讶的是，谷歌在我引用的第一部分错误中没有点击率

原来我不需要中的
&
s

struct EnhancedNodeComparator {
    bool operator() (const EnhancedNode*& a, const EnhancedNode*& b) const {
我是在另一个编译器上编译的

#包括
#包括
使用名称空间std；
树状结构{
int-val；
TreeNode*左；
TreeNode*对；
树节点（intx）：val（x），左（nullptr），右（nullptr）{
};
类增强节点{
公众：
增强节点（树节点*节点）{
节点=节点；
距离=数值限制：：max（）；
丢弃=错误；
}
树节点*node_u2;；
双倍距离；
布尔；
};
结构增强子节点比较器{
布尔运算符（）（常量增强节点*&a，常量增强节点*&b）常量{
返回a->distance\ub->distance\ux；
}
};
int main（）

In file included from /usr/include/c++/4.9/set:60:0,
                 from 3:
/usr/include/c++/4.9/bits/stl_tree.h: In instantiation of 'std::pair<std::_Rb_tree_node_base*, std::_Rb_tree_node_base*> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_get_insert_unique_pos(const key_type&) [with _Key = EnhancedNode*; _Val = EnhancedNode*; _KeyOfValue = std::_Identity<EnhancedNode*>; _Compare = EnhancedNodeComparator; _Alloc = std::allocator<EnhancedNode*>; std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::key_type = EnhancedNode*]':
/usr/include/c++/4.9/bits/stl_tree.h:1498:47:   required from 'std::pair<std::_Rb_tree_iterator<_Val>, bool> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique(_Arg&&) [with _Arg = EnhancedNode*; _Key = EnhancedNode*; _Val = EnhancedNode*; _KeyOfValue = std::_Identity<EnhancedNode*>; _Compare = EnhancedNodeComparator; _Alloc = std::allocator<EnhancedNode*>]'
/usr/include/c++/4.9/bits/stl_set.h:511:40:   required from 'std::pair<typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator, bool> std::set<_Key, _Compare, _Alloc>::insert(std::set<_Key, _Compare, _Alloc>::value_type&&) [with _Key = EnhancedNode*; _Compare = EnhancedNodeComparator; _Alloc = std::allocator<EnhancedNode*>; typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator = std::_Rb_tree_const_iterator<EnhancedNode*>; std::set<_Key, _Compare, _Alloc>::value_type = EnhancedNode*]'
33:54:   required from here
/usr/include/c++/4.9/bits/stl_tree.h:1445:11: error: no match for call to '(EnhancedNodeComparator) (EnhancedNode* const&, EnhancedNode* const&)'
    __comp = _M_impl._M_key_compare(__k, _S_key(__x));
           ^
24:8: note: candidate is:
25:10: note: bool EnhancedNodeComparator::operator()(const EnhancedNode*&, const EnhancedNode*&) const
25:10: note:   no known conversion for argument 1 from 'const key_type {aka EnhancedNode* const}' to 'const EnhancedNode*&'
In file included from /usr/include/c++/4.9/set:60:0,
                 from 3:
/usr/include/c++/4.9/bits/stl_tree.h:1456:7: error: no match for call to '(EnhancedNodeComparator) (EnhancedNode* const&, EnhancedNode* const&)'
       if (_M_impl._M_key_compare(_S_key(__j._M_node), __k))
       ^
24:8: note: candidate is:
25:10: note: bool EnhancedNodeComparator::operator()(const EnhancedNode*&, const EnhancedNode*&) const
25:10: note:   no known conversion for argument 1 from 'EnhancedNode* const' to 'const EnhancedNode*&'
In file included from /usr/include/c++/4.9/set:60:0,
                 from 3:
/usr/include/c++/4.9/bits/stl_tree.h: In instantiation of 'std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_(std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_Base_ptr, std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_Base_ptr, _Arg&&) [with _Arg = EnhancedNode*; _Key = EnhancedNode*; _Val = EnhancedNode*; _KeyOfValue = std::_Identity<EnhancedNode*>; _Compare = EnhancedNodeComparator; _Alloc = std::allocator<EnhancedNode*>; std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::iterator = std::_Rb_tree_iterator<EnhancedNode*>; std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_Base_ptr = std::_Rb_tree_node_base*]':
/usr/include/c++/4.9/bits/stl_tree.h:1502:38:   required from 'std::pair<std::_Rb_tree_iterator<_Val>, bool> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique(_Arg&&) [with _Arg = EnhancedNode*; _Key = EnhancedNode*; _Val = EnhancedNode*; _KeyOfValue = std::_Identity<EnhancedNode*>; _Compare = EnhancedNodeComparator; _Alloc = std::allocator<EnhancedNode*>]'
/usr/include/c++/4.9/bits/stl_set.h:511:40:   required from 'std::pair<typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator, bool> std::set<_Key, _Compare, _Alloc>::insert(std::set<_Key, _Compare, _Alloc>::value_type&&) [with _Key = EnhancedNode*; _Compare = EnhancedNodeComparator; _Alloc = std::allocator<EnhancedNode*>; typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator = std::_Rb_tree_const_iterator<EnhancedNode*>; std::set<_Key, _Compare, _Alloc>::value_type = EnhancedNode*]'
33:54:   required from here
/usr/include/c++/4.9/bits/stl_tree.h:1140:8: error: no match for call to '(EnhancedNodeComparator) (EnhancedNode*&, EnhancedNode* const&)'
        || _M_impl._M_key_compare(_KeyOfValue()(__v),
        ^
24:8: note: candidate is:
25:10: note: bool EnhancedNodeComparator::operator()(const EnhancedNode*&, const EnhancedNode*&) const
25:10: note:   no known conversion for argument 1 from 'EnhancedNode*' to 'const EnhancedNode*&'



struct EnhancedNodeComparator {
    bool operator() (EnhancedNode const * const& a, EnhancedNode const * const& b) const {
        return a->distance_ < b->distance_;
    }
};