c++中各种文件之间的包含与组织

Query_base是抽象基类，WordQuery,NotQuery和BinaryQuery继承Query_base类，BinaryQuery也是抽象类，AndQuery和OrQuery继承BinaryQuery类,Query是句柄指针类。Query类重载&,~,|,他们分别需要访问AndQuery，OrQuery，NotQuery，在Query中已经分别将要重载的函数设为友元，因为要返回派生类，所以在派生类定义后才能实现重载函数，
要实现的操作为比如：
Query operator&(const Query& first,const Query& second)
{  return new AndQuery(first,second);}//这里以用复制构造函数将类的指针                                       // 转化为Query对象
以下是我的文件组织形式

Query.h中用#include "Query_base.h"

Query_base.h 不用包含

WordQuery.h中
#include "Query_base.h"
#include "Query.h"
class WordQuery:public Query_base{....}
Query::Query(const string& s)
{ return new WordQuery(s);}

NotQuery.h中
#include "Query_base.h"
#include "Query.h"
class NotQuery::public Query_base{....}
Query operator~(const Query& query)
{  return new NotQuery(query);}

BinaryQuery.h中
#include "Query_base.h"

AndQuery.h中
#include "BinaryQuery.h"
#include "Query.h"
class AndQuery:public BinaryQuery{...}
Query operator&(const Query& first,const Query& second)
{  return new AndQuery(first,second);}

OrQuery.h中
#include "BinaryQuery.h"
#include "OrQuery.h"
class OrQuery:public BinaryQuery{....}
Query operator|(const Query& first,const Query& second)
{  return new OrQuery(first,second);}

然后编译链接时提示的错误为
[Linker error] undefined reference to `Query::Query(std::string const&)'  [Linker error] undefined reference to `Query::Query(std::string const&)'
[Linker error] undefined reference to `Query::Query(std::string const&)'
[Linker error] undefined reference to `operator&(Query const&, Query const&)'
[Linker error] undefined reference to `Query::Query(std::string const&)'
[Linker error] undefined reference to `Query::Query(std::string const&)'
[Linker error] undefined reference to `Query::Query(std::string const&)'
[Linker error] undefined reference to `operator&(Query const&, Query const&)'
[Linker error] undefined reference to `operator|(Query const&, Query const&)'
求高手帮我解释下原因，如何解决，详细点，谢谢
可以的话顺便给点编译链接的资料