c++ - 迭代我的对象停止工作

Question

由于某些原因这段代码抛出一个错误

// map<int, AnItem> roomlist;
// map<string, long> rinventory

map<int, AnItem>::iterator it;

for ( it = roomlist[roomno].rinventory.beg/in(); it != roomlist[roomno].rinventory.end(); it++ )    {

        if( (*it).second.name == "Stock" )
            tmpitem.append( strmug );
    }

if 语句抛出错误。它真的没有那么复杂，我想我可以处理这个。所以... roomlist 是一张 map ，roomno 是一个整数，rinventory 是一张 map

class AnThing   {

public:
    AnThing();              // constructor
    string name;                // name reference
    int gtid;               // Thing ID
    string lcname;              // name in lowercase
    string m_name;
};

class AnItem : public AnThing   {

public:

    ItemType m_type;
    int imin;
    int imax;
    int ispeed;
    long unsigned iprice;
    unsigned int ecoin;
    GAttributes m_attributes;

    AnItem(); //Constructs an item with "invalid" values

    int& Min(); // Returns the min attribute
    int& Max(); // Returns the max attribute
    int& Speed(); // Returns the speed attribute

};

提前致谢!我将在下面附加我得到的错误(其中有两个)

c:\ucdhb2\gaia\logonserver\v6\gaiaserver.cpp(812) : error C2679: binary '=' : no operator found which takes a right-hand operand of type 'std::_Tree<_Traits>::iterator' (or there is no acceptable conversion) 1> with 1> [ 1>
_Traits=std::_Tmap_traits,std::allocator>,false> 1> ] 1> c:\program files\microsoft visual studio 9.0\vc\include\xtree(498): could be 'std::_Tree<_Traits>::iterator &std::_Tree<_Traits>::iterator::operator =(const std::_Tree<_Traits>::iterator &)' 1> with 1> [ 1>
_Traits=std::_Tmap_traits,std::allocator>,false> 1> ] 1> while trying to match the argument list '(std::_Tree<_Traits>::iterator, std::_Tree<_Traits>::iterator)' 1> with 1> [ 1>
_Traits=std::_Tmap_traits,std::allocator>,false> 1> ] 1> and 1> [ 1>
_Traits=std::_Tmap_traits,std::allocator>,false> 1> ] 1>c:\ucdhb2\gaia\logonserver\v6\gaiaserver.cpp(812) : error C2678: binary '!=' : no operator found which takes a left-hand operand of type 'std::_Tree<_Traits>::iterator' (or there is no acceptable conversion) 1> with 1> [ 1>
_Traits=std::_Tmap_traits,std::allocator>,false> 1> ] 1> c:\program files\microsoft sdks\windows\v6.0a\include\guiddef.h(197): could be 'int operator !=(const GUID &,const GUID &)' 1> c:\program files\microsoft visual studio 9.0\vc\include\xtree(314): or 'bool std::_Tree<_Traits>::const_iterator::operator !=(const std::_Tree<_Traits>::const_iterator &) const' 1> with 1>
[ 1>
_Traits=std::_Tmap_traits,std::allocator>,false> 1> ] 1> while trying to match the argument list '(std::_Tree<_Traits>::iterator, std::_Tree<_Traits>::iterator)' 1> with 1> [ 1>
_Traits=std::_Tmap_traits,std::allocator>,false> 1> ] 1> and 1> [ 1>
_Traits=std::_Tmap_traits,std::allocator>,false> 1> ]

Answer 1

你的迭代器

map<int, AnItem>::iterator it;

需要类型

map<string, long>::iterator it;

根据您的评论(即您正在遍历 rinventory，而不是 roomlist)。