【 以下文字转载自 LinuxDev 讨论区 】
发信人: zhanghaoX (环顾四方有效), 信区: LinuxDev
标  题: 奇怪的问题： Debian的头文件 ？
发信站: 水木社区 (Thu Jun 18 16:10:10 2020), 站内


Debian10  编译一个C++程序 ，

const wchar_t* szFileName,
ofstream ofs;
ofs.open( szFileName , std::ios::out ) ;

报错：

error: no matching function for call to ‘std::basic_ofstream<char>::open(const wchar_t*&, const openmode&)’
   ofs.open( szFileName , std::ios::out ) ;
                                        ^
In file included from /home/a/share/xxxx.cpp:9:
/usr/include/c++/8/fstream:851:7: note: candidate: ‘void std::basic_ofstream<_CharT, _Traits>::open(const char*, std::ios_base::openmode) [with _CharT = char; _Traits = std::char_traits<char>; std::ios_base::openmode = std::_Ios_Openmode]’
       open(const char* __s, ios_base::openmode __mode = ios_base::out)
       ^~~~
/usr/include/c++/8/fstream:851:7: note:   no known conversion for argument 1 from ‘const wchar_t*’ to ‘const char*’
/usr/include/c++/8/fstream:871:7: note: candidate: ‘void std::basic_ofstream<_CharT, _Traits>::open(const string&, std::ios_base::openmode) [with _CharT = char; _Traits = std::char_traits<char>; std::__cxx11::string = std::__cxx11::basic_string<char>; std::ios_base::openmode = std::_Ios_Openmode]’
       open(const std::string& __s, ios_base::openmode __mode = ios_base::out)
       ^~~~
/usr/include/c++/8/fstream:871:7: note:   no known conversion for argument 1 from ‘const wchar_t*’ to ‘const string&’ {aka ‘const std::__cxx11::basic_string<char>&’}
make[2]: *** [oooooo/CMakeFiles/oooooo.dir/build.make:102: oooooo/CMakeFiles/oooooo.dir/oooooo.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....



头文件竟然没有 wchar_t* 的
/usr/include/c++/8/fstream:

    /**
       *  @brief  Opens an external file.
       *  @param  __s  The name of the file.
       *  @param  __mode  The open mode flags.
       *
       *  Calls @c std::basic_filebuf::open(s,__mode|in).  If that function
       *  fails, @c failbit is set in the stream's error state.
       */
      void
      open(const char* __s, ios_base::openmode __mode = ios_base::in)
      {
    if (!_M_filebuf.open(__s, __mode | ios_base::in))
      this->setstate(ios_base::failbit);
    else
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 409. Closing an fstream should clear error state
      this->clear();
      }

#if __cplusplus >= 201103L
      /**
       *  @brief  Opens an external file.
       *  @param  __s  The name of the file.
       *  @param  __mode  The open mode flags.
       *
       *  Calls @c std::basic_filebuf::open(__s,__mode|in).  If that function
       *  fails, @c failbit is set in the stream's error state.
       */
      void
      open(const std::string& __s, ios_base::openmode __mode = ios_base::in)
      {
    if (!_M_filebuf.open(__s, __mode | ios_base::in))
      this->setstate(ios_base::failbit);
    else
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 409. Closing an fstream should clear error state
      this->clear();
      }

#if __cplusplus >= 201703L
      /**
       *  @brief  Opens an external file.
       *  @param  __s  The name of the file, as a filesystem::path.
       *  @param  __mode  The open mode flags.
       *
       *  Calls @c std::basic_filebuf::open(__s,__mode|in).  If that function
       *  fails, @c failbit is set in the stream's error state.
       */
      template<typename _Path>
    _If_fs_path<_Path, void>
    open(const _Path& __s, ios_base::openmode __mode = ios_base::in)
    { open(__s.c_str(), __mode); }
#endif // C++17
#endif // C++11

      /**
       *  @brief  Close the file.
       *
       *  Calls @c std::basic_filebuf::close().  If that function
       *  fails, @c failbit is set in the stream's error state.
       */
      void
      close()
      {
    if (!_M_filebuf.close())
      this->setstate(ios_base::failbit);
      }
    };
--
FROM 121.69.79.*