C++17才有支持吧？
之前linux上是char，windows才是wchar_t
【 在 zhanghaoX (环顾四方有效) 的大作中提到: 】
: 标  题: 奇怪的问题： Debian的头文件 ？
: 发信站: 水木社区 (Thu Jun 18 16:10:31 2020), 站内
:
: 【 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);
:       }
:     };
:
:
:
:
: --
:
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