c++ - std::vector<std::ofstream>::erase 给出编译错误

Question

您好，我正在尝试执行一些文件操作，如果需要，用户可以打开多个文件。我已经创建了一个 vector 派生的 ofstream 但是当我想删除 i.使用 std::vector<Type>::erase(std::vector<Type>::iterator) 编译器的元素(哪个文件已关闭)给我错误，但我有另一个 vector 派生的 std::string 并且我以同样的方式删除它，它没有给出错误。我的代码是；

#include <iostream>
#include <fstream>
#include <vector>

std::vector<std::ofstream> of;
std::vector<std::string> sv;

int CloseFile(int id, file_t ft) {
    std::vector<std::ofstream>::iterator i;
    std::vector<std::string>::iterator j;
    if (of[id].is_open() == true) {
        of[id].close();
        i = of.begin() + id;
        j = sv.begin() + id;
        of.erase(i); // showing error for this line
        sv.erase(j);
    }
}

我在 Ubuntu 12.04 上使用 Nsight Eclipse Edition 6.0，我需要打开一个或多个文件，但 Eclipse 输出的问题部分的错误是；

1. 需要来自‘_OI std::__copy_move_a(_II, _II, _OI) [with bool _IsMove = false; _II = std::basic_ofstream; _OI = std::basic_ofstream]
2. 需要来自‘_OI std::__copy_move_a2(_II, _II, _OI) [with bool _IsMove = false; _II = __gnu_cxx::__normal_iterator*, std::vector >>; _OI = __gnu_cxx::__normal_iterator*, std::vector >>]
3. 需要来自‘_OI std::copy(_II, _II, _OI) [with _II = __gnu_cxx::__normal_iterator*, std::vector >>; _OI = __gnu_cxx::__normal_iterator*, std::vector >>]
4. 需要来自‘_OI std::copy(_II, _II, _OI) [with _II = __gnu_cxx::__normal_iterator*, std::vector >>; _OI = __gnu_cxx::__normal_iterator*, std::vector >>]
5. std::basic_streambuf<_CharT, _Traits>& std::basic_streambuf<_CharT, _Traits>::operator=(const std::basic_streambuf<_CharT, _Traits>&) [with _CharT = char; _Traits = std::char_traits]
6. std::ios_base& std::ios_base::operator=(const std::ios_base&)
7. make: *** [dosya/dosya.o] 错误 1
8. 在此内容中
9. 在此内容中
10. 需要从这里

最后一个错误提示代码行

编译器输出: (有些词是土耳其语，dosya = file，GeriDonus_t = Return_t，DosyaKapat = FileClose)

16:06:56 **** Incremental Build of configuration Debug for project deneme ****`
make all`
Building file: ../dosya/dosya.cpp`
Invoking: NVCC Compiler`
/usr/local/cuda-6.0/bin/nvcc -I"/usr/local/cuda-6.0/samples/3_Imaging" -I"/usr/local    /cuda-6.0/samples/common/inc" -I"/opt/Calismalar/Cuda/cuda-workspace/deneme" -I/usr/local/opencv/include -I/usr/local/opencv/include/opencv -I/opt/Calismalar/Cuda/cuda-workspace/deneme/ -G -g -O0 -gencode arch=compute_30,code=sm_30 -gencode arch=compute_32,code=sm_32  -odir "dosya" -M -o "dosya/dosya.d" "../dosya/dosya.cpp"`
nvcc warning : The 'compute_10' and 'sm_10' architectures are deprecated, and may be removed in a future release.`
/usr/local/cuda-6.0/bin/nvcc -I"/usr/local/cuda-6.0/samples/3_Imaging" -I"/usr/local/cuda-6.0/samples/common/inc" -I"/opt/Calismalar/Cuda/cuda-workspace/deneme" -I/usr/local/opencv/include -I/usr/local/opencv/include/opencv -I/opt/Calismalar/Cuda/cuda-workspace/deneme/ -G -g -O0 --compile  -x c++ -o  "dosya/dosya.o" "../dosya/dosya.cpp"
In file included from /usr/include/c++/4.8/ios:42:0,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from ../dosya/dosya.h:13,
                 from ../dosya/dosya.cpp:9:
/usr/include/c++/4.8/bits/basic_ios.h: In instantiation of ‘static _OI std::__copy_move<false, false, std::random_access_iterator_tag>::__copy_m(_II, _II, _OI) [with _II = std::basic_ofstream<char>*; _OI = std::basic_ofstream<char>*]’:
/usr/include/c++/4.8/bits/stl_algobase.h:390:70:   required from ‘_OI std::__copy_move_a(_II, _II, _OI) [with bool _IsMove = false; _II = std::basic_ofstream<char>*; _OI = std::basic_ofstream<char>*]’
/usr/include/c++/4.8/bits/stl_algobase.h:428:38:   required from ‘_OI std::__copy_move_a2(_II, _II, _OI) [with bool _IsMove = false; _II = __gnu_cxx::__normal_iterator<std::basic_ofstream<char>*, std::vector<std::basic_ofstream<char> > >; _OI = __gnu_cxx::__normal_iterator<std::basic_ofstream<char>*, std::vector<std::basic_ofstream<char> > >]’
/usr/include/c++/4.8/bits/stl_algobase.h:460:17:   required from ‘_OI std::copy(_II, _II, _OI) [with _II = __gnu_cxx::__normal_iterator<std::basic_ofstream<char>*, std::vector<std::basic_ofstream<char> > >; _OI = __gnu_cxx::__normal_iterator<std::basic_ofstream<char>*, std::vector<std::basic_ofstream<char> > >]’
/usr/include/c++/4.8/bits/vector.tcc:138:2:   required from ‘std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::erase(std::vector<_Tp, _Alloc>::iterator) [with _Tp = std::basic_ofstream<char>; _Alloc = std::allocator<std::basic_ofstream<char> >; std::vector<_Tp, _Alloc>::iterator = __gnu_cxx::__normal_iterator<std::basic_ofstream<char>*, std::vector<std::basic_ofstream<char> > >; typename std::_Vector_base<_Tp, _Alloc>::pointer = std::basic_ofstream<char>*]’
../dosya/dosya.cpp:152:27:   required from here
/usr/include/c++/4.8/bits/ios_base.h:789:5: error: ‘std::ios_base& std::ios_base::operator=(const std::ios_base&)’ is private
     operator=(const ios_base&);
     ^
In file included from /usr/include/c++/4.8/ios:44:0,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from ../dosya/dosya.h:13,
                 from ../dosya/dosya.cpp:9:
/usr/include/c++/4.8/bits/basic_ios.h:66:11: error: within this context
     class basic_ios : public ios_base
           ^
In file included from /usr/include/c++/4.8/iostream:39:0,
                 from ../dosya/dosya.h:13,
                 from ../dosya/dosya.cpp:9:
/usr/include/c++/4.8/ostream:58:11: note: synthesized method ‘std::basic_ios<char>& std::basic_ios<char>::operator=(const std::basic_ios<char>&)’ first required here 
     class basic_ostream : virtual public basic_ios<_CharT, _Traits>
           ^
In file included from ../dosya/dosya.h:14:0,
                 from ../dosya/dosya.cpp:9:
/usr/include/c++/4.8/fstream:599:11: note: synthesized method ‘std::basic_ostream<char>& std::basic_ostream<char>::operator=(const std::basic_ostream<char>&)’ first required here 
     class basic_ofstream : public basic_ostream<_CharT,_Traits>
           ^
In file included from /usr/include/c++/4.8/ios:43:0,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from ../dosya/dosya.h:13,
                 from ../dosya/dosya.cpp:9:
/usr/include/c++/4.8/streambuf:810:7: error: ‘std::basic_streambuf<_CharT, _Traits>& std::basic_streambuf<_CharT, _Traits>::operator=(const std::basic_streambuf<_CharT, _Traits>&) [with _CharT = char; _Traits = std::char_traits<char>]’ is private
       operator=(const basic_streambuf&) { return *this; };
       ^
In file included from ../dosya/dosya.h:14:0,
                 from ../dosya/dosya.cpp:9:
/usr/include/c++/4.8/fstream:72:11: error: within this context
     class basic_filebuf : public basic_streambuf<_CharT, _Traits>
           ^
/usr/include/c++/4.8/fstream:599:11: note: synthesized method ‘std::basic_filebuf<char>& >std::basic_filebuf<char>::operator=(const std::basic_filebuf<char>&)’ first required here 
     class basic_ofstream : public basic_ostream<_CharT,_Traits>
           ^
In file included from /usr/include/c++/4.8/bits/char_traits.h:39:0,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from ../dosya/dosya.h:13,
                 from ../dosya/dosya.cpp:9:
/usr/include/c++/4.8/bits/stl_algobase.h:335:18: note: synthesized method ‘std::basic_ofstream<char>& std::basic_ofstream<char>::operator=(const std::basic_ofstream<char>&)’ first required here 
        *__result = *__first;
                  ^
make: *** [dosya/dosya.o] Error 1

16:06:57 Build Finished (took 456ms)`

我对此一无所知。我也看过 this ， this ， this ， this (它是关于 eclipse bug )， FAQ - q7.1， this (关于 List 但错误是相同的并且说错误实际上不是错误而且我没有更改编译器(nvcc )).谢谢大家。

Answer 1

Gcc-4.8 不支持移动流。在这方面，您的代码符合 C++11，只是您的实现不符合。