c++ - 在 C++ 中将 fstreams 加载到 std::vector

Question

这是一个既简单又复杂的问题。

编译:

int Test;
vector<int> TEST;
TEST.push_back(Test);
cout << TEST.size();

这不编译:

fstream Test;
vector<fstream> TEST;
TEST.push_back(Test);
cout << TEST.size();

有什么特别的原因吗？ 有没有办法让我获得 fstreams 的动态列表？

错误信息:

1>------ Build started: Project: vector_test, Configuration: Debug Win32 ------
1>  vector_test.cpp
1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\fstream(1347): error C2248: 'std::basic_ios<_Elem,_Traits>::basic_ios' : cannot access private member declared in class 'std::basic_ios<_Elem,_Traits>'
1>          with
1>          [
1>              _Elem=char,
1>              _Traits=std::char_traits<char>
1>          ]
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\ios(176) : see declaration of 'std::basic_ios<_Elem,_Traits>::basic_ios'
1>          with
1>          [
1>              _Elem=char,
1>              _Traits=std::char_traits<char>
1>          ]
1>          This diagnostic occurred in the compiler generated function 'std::basic_fstream<_Elem,_Traits>::basic_fstream(const std::basic_fstream<_Elem,_Traits> &)'
1>          with
1>          [
1>              _Elem=char,
1>              _Traits=std::char_traits<char>
1>          ]
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Answer 1

对象 fstream不可复制。

如果需要记录fstream s 在 vector你可以声明一个 std::vector<std::fstream*>并推回对象的地址。请记住，如果保存指针，则必须确保在访问它时该对象仍然存在。