C++构造函数初始化字符串字段，字段有顺序要求

来源：互联网发布：大数据人才的薪资待遇编辑：程序博客网时间：2024/06/05 10:34

class DCollection: public DMap<Key, CObject> {
public:

DCollection(std::string collectionName, DBClientConnection& conn,std::string dbName) :_collectionName(collectionName),_dbName(dbName),

_conn(conn) {

}

private:

   DCollection();

   std::string _collectionName;
   DBClientConnection& _conn;
   std::string _dbName;

};

像这样报错：

../src/db/config/../../memory/DCollection.h:154:14: warning: ‘memory::DCollection<std::basic_string<char>, memory::DSuper>::_dbName’ will be initialized after [-Wreorder]
../src/db/config/../../memory/DCollection.h:153:22: warning: ‘mongo::DBClientConnection& memory::DCollection<std::basic_string<char>, memory::DSuper>::_conn’ [-Wreorder]
../src/db/config/../../memory/DCollection.h:33:2: warning: when initialized here [-Wreorder]

这里说的是:_dbName字段不能在_conn字段后面，说得还很明白

解法办法就是，让他们换一下顺序：

private:

   DCollection();
    std::string _dbName;
   std::string _collectionName;
   DBClientConnection& _conn;

};

这估计是c++的关于有引用方面的要求