我在我程序中使用了std::vector,编译时遇到以下错误:
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/vector.tcc:在成员函数`User& User::operator=(const User&)’中: /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/vector.tcc:238: 实例化自 void std::vector<_Tp, _Alloc>::_M_insert_aux(__gnu_cxx::__normal_iterator<typename _Alloc::pointer, std::vector<_Tp, _Alloc> >, const _Tp&) [with _Tp = User, _Alloc = std::allocator<User>]' /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_vector.h:564: 实例化自 void std::vector<_Tp, _Alloc>::push_back(const _Tp&) [with _Tp = User, _Alloc = std::allocator]'
main.cpp:100: 在此实例化:
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/vector.tcc:238: 错误:非静态const成员 'const std::string User::NAME',无法使用默认赋值运算符
我的程序中有类"User"和"Users":
如果我删除第二行
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/vector.tcc:在成员函数`User& User::operator=(const User&)’中: /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/vector.tcc:238: 实例化自 void std::vector<_Tp, _Alloc>::_M_insert_aux(__gnu_cxx::__normal_iterator<typename _Alloc::pointer, std::vector<_Tp, _Alloc> >, const _Tp&) [with _Tp = User, _Alloc = std::allocator<User>]' /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_vector.h:564: 实例化自 void std::vector<_Tp, _Alloc>::push_back(const _Tp&) [with _Tp = User, _Alloc = std::allocator]'
main.cpp:100: 在此实例化:
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/vector.tcc:238: 错误:非静态const成员 'const std::string User::NAME',无法使用默认赋值运算符
我的程序中有类"User"和"Users":
class User {
public:
const string NAME;
User(const string &name, const bool &isMain = false) : NAME(name), isMain(isMain) {};
void addFollower(User * user);
void addReplier(User * user, const int &count);
void addMentioner(User * user, const int &count);
void addRetweeter(User * user, const int &count);
private:
vector<User *> followedBy, repliedBy, mentionedBy, retweetedBy;
vector<int> replyCount, mentionCount, retweetCount;
bool isMain;
};
class Users {
public:
vector<User> users;
void addUser(const string &name, bool isMain = false);
User * findUser(const string &name);
friend ostream & operator <<(ostream &outStream, const Users &users);
User & operator [] (unsigned int index);
};
事情是这样的。错误是由方法Users::addUser()引起的:
void Users::addUser(const string &name, bool isMain) {
User newUser(name, isMain);
users.push_back(newUser);
}
如果我删除第二行
users.push_back(newUser);
这段代码可以正常工作,但是它阻止我向“用户”向量数组中添加新记录。如果有人能告诉我原因,我将不胜感激。谢谢。