ofstream+指针
源代码
--------------------------------------------------------------------------...
class OutStream{
private:
ofstream outFile;
string filename;
public:
OutStream(string filename) : filename(filename) {
outFile.open(filename.c_str(), ios::app , 0);
if (!outFile) {
printf("create file %s failed , exit !\n", filename.c_str());
exit(1);
}
}
~OutStream() {
outFile.close();
}
ofstream getoutStream() { return outFile; }
// 这个程序报错如下 ？？？？？？？？？？？？？？？问题出在此处：如果改成
// ofstream getoutStream(){ return &outFile;}就正确了，请教为什么？？？？？？？？？？非常感谢！！！
string getFileName() { return filename; }
};
...
运行结果
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1>------ 已启动生成: 项目: test2, 配置: Debug Win32 ------
1>生成启动时间为 2010/11/28 19:15:18。
1>ClCompile:
1> google_c++.cpp
1>d:\program files\microsoft visual studio 10.0\vc\include\fstream(1116): error C2248: “std::basic_ios<_Elem,_Traits>::basic_ios”: 无法访问 private 成员(在“std::basic_ios<_Elem,_Traits>”类中声明)
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\ios(176) : 参见“std::basic_ios<_Elem,_Traits>::basic_ios”的声明
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> 此诊断出现在编译器生成的函数“std::basic_ofstream<_Elem,_Traits>::basic_ofstream(const std::basic_ofstream<_Elem,_Traits> &)”中
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1>c:\users\administrator\documents\visual studio 2010\projects\test2\test2\google_c++.cpp(94): error C2819: “std::basic_ofstream<_Elem,_Traits>”类型没有重载成员“operator ->”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> 是否改用“.”?
1>c:\users\administrator\documents\visual studio 2010\projects\test2\test2\google_c++.cpp(94): error C2232: “->std::basic_ostream<_Elem,_Traits>::write”: 左操作数有“class”类型，使用“.”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1>
1>生成失败。
1>
1>已用时间 00:00:01.10
========== 生成: 成功 0 个，失败 1 个，最新 0 个，跳过 0 个 ==========
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[解决办法]
板书太差了！
