使用ofstream编译错误 [英] compilation error using ofstream
问题描述
您好，有没有人对此错误有任何疑问？以及如何解决它？
这对我来说似乎微不足道，但对于编译器却没有。我在Ubuntu Linux系统上使用g ++
4.2：
// main（）
....
std :: ofstream fout;
fout.open（" hello.out"）;
fout<< setfill（'' - ''）<< setw（20）<<" - "<< setfill（''''）<< endl;
fout<< 你好; //这是第139行
....
main.cxx：89：从这里实例化
main.cxx ：139：错误：ISO C ++说这些都是模棱两可的，即使是
虽然第一个最差的转换比第二个最差的转换
更好：
/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/
ostream.tcc：735：注意：候选人1：std :: basic_ostream< char，_Traits>&
std :: operator<<（std :: basic_ostream< char，_Traits>& ;，const char *）[with
_Traits = std :: char_traits< char>]
Domain.h：507：注意：候选人2：o& operator<<（o&，const Domain&）
[with o = std :: ofstream]
make：*** [main.o]错误1
谢谢大家！
a2
Hello, does anyone have a clue about this error? and how to solve it?
It seems to be trivial to me, but not for the compiler. I''m using g++
4.2 on an Ubuntu Linux system:
// main()
....
std::ofstream fout;
fout.open("hello.out");
fout<<setfill(''-'')<<setw(20)<<"-"<<setfill('' '')<<endl;
fout<<"hello "; // this is line 139
....
main.cxx:89: instantiated from here
main.cxx:139: error: ISO C++ says that these are ambiguous, even
though the worst conversion for the first is better than the worst
conversion for the second:
/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/
ostream.tcc:735: note: candidate 1: std::basic_ostream<char, _Traits>&
std::operator<<(std::basic_ostream<char, _Traits>&, const char*) [with
_Traits = std::char_traits<char>]
Domain.h:507: note: candidate 2: o& operator<<(o&, const Domain&)
[with o = std::ofstream]
make: *** [main.o] Error 1
Thank you all!
a2
推荐答案
aaragon写道：
aaragon wrote:
您好，有没有人对此错误有任何疑问？以及如何解决它？
这对我来说似乎微不足道，但对于编译器却没有。我在Ubuntu Linux系统上使用g ++
4.2：
// main（）
...
std :: ofstream fout;
fout.open（" hello.out"）;
fout<< setfill（'' - ''）<< setw（20）<<" - "<< setfill（''''）<< endl;
fout<<" ;你好; //这是第139行
...
main.cxx：89：从这里实例化
main.cxx： 139：错误：ISO C ++说这些都是模棱两可的，即使是
虽然第一个最差的转换比第二个最差的转换
更好：
/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/
ostream.tcc：735：注意：候选人1：std :: basic_ostream< char，_Traits>&
std :: operator<<（std :: basic_ostream< char，_Traits>& ，const char *）[with
_Traits = std :: char_traits< char>]
Domain.h：507：注意：候选人2：o& operator<<（o&，const Domain&）
[with o = std :: ofstream]
make：*** [main.o]错误1
Hello, does anyone have a clue about this error? and how to solve it?
It seems to be trivial to me, but not for the compiler. I''m using g++
4.2 on an Ubuntu Linux system:
// main()
...
std::ofstream fout;
fout.open("hello.out");
fout<<setfill(''-'')<<setw(20)<<"-"<<setfill('' '')<<endl;
fout<<"hello "; // this is line 139
...
main.cxx:89: instantiated from here
main.cxx:139: error: ISO C++ says that these are ambiguous, even
though the worst conversion for the first is better than the worst
conversion for the second:
/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/
ostream.tcc:735: note: candidate 1: std::basic_ostream<char, _Traits>&
std::operator<<(std::basic_ostream<char, _Traits>&, const char*) [with
_Traits = std::char_traits<char>]
Domain.h:507: note: candidate 2: o& operator<<(o&, const Domain&)
[with o = std::ofstream]
make: *** [main.o] Error 1
我没有看到任何Domain.h或者在你的代码中称为域名的类型。
V
-
请删除大写''A'在回复电子邮件时
我没有回复最热门的回复，请不要问
I don''t see any "Domain.h" or types called ''Domain'' in your code.
V
--
Please remove capital ''A''s when replying by e-mail
I do not respond to top-posted replies, please don''t ask
9月26日，下午2:41，Victor Bazarov < v.Abaza ... @ comAcast.netwrote：
On Sep 26, 2:41 pm, "Victor Bazarov" <v.Abaza...@comAcast.netwrote:
aaragon写道：
aaragon wrote:
您好，有没有人对这个错误有所了解？以及如何解决它？
这对我来说似乎微不足道，但对于编译器却没有。我在Ubuntu Linux系统上使用g ++
4.2：
Hello, does anyone have a clue about this error? and how to solve it?
It seems to be trivial to me, but not for the compiler. I''m using g++
4.2 on an Ubuntu Linux system:
// main（）
...
std :: ofstream fout;
fout.open（" hello.out"）;
fout< ;< setfill（'' - ''）<< setw（20）<<" - "<< setfill（''''）<< endl;
fout<<" hello" ;; //这是139行
...
// main()
...
std::ofstream fout;
fout.open("hello.out");
fout<<setfill(''-'')<<setw(20)<<"-"<<setfill('' '')<<endl;
fout<<"hello "; // this is line 139
...
main.cxx：89：从这里实例化
main.cxx：139：错误：ISO C ++说这些是模棱两可的，即使是
虽然最差的转换比最差的转换更好
转换对于第二个：
/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits /
ostream.tcc：735：注意：候选人1：std :: basic_ostream< char，_Traits>&
std :: operator<<（std :: basic_ostream< char，_Traits>&，const char *）[with
_Traits = std :: char_traits< char>]
Domain.h：507：注意：候选人2：o& operator<<（o&，const Domain&）
[with o = std :: ofstream]
make：*** [main.o]错误1
main.cxx:89: instantiated from here
main.cxx:139: error: ISO C++ says that these are ambiguous, even
though the worst conversion for the first is better than the worst
conversion for the second:
/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/
ostream.tcc:735: note: candidate 1: std::basic_ostream<char, _Traits>&
std::operator<<(std::basic_ostream<char, _Traits>&, const char*) [with
_Traits = std::char_traits<char>]
Domain.h:507: note: candidate 2: o& operator<<(o&, const Domain&)
[with o = std::ofstream]
make: *** [main.o] Error 1
我没有看到任何Domain.h或者在你的代码中称为域名的类型。
V
-
请删除大写''A'当通过电子邮件回复时
我没有回复最热门的回复，请不要问
I don''t see any "Domain.h" or types called ''Domain'' in your code.
V
--
Please remove capital ''A''s when replying by e-mail
I do not respond to top-posted replies, please don''t ask
嗯，我重载了运算符<<产生我设计的类的输出。但编译器不应该从传递给运算符<< ????的类型中扣除这一点。为什么这个电话不明确????
Well, I overloaded operator<< to produce the output of a class that I
designed. But shouldn''t the compiler deduct this from the type being
passed to operator<<???? Why is it the call ambiguous????
aaragon写道：
aaragon wrote:
您好，有没有人对这个错误有所了解？以及如何解决它？
这对我来说似乎微不足道，但对于编译器却没有。我在Ubuntu Linux系统上使用g ++
4.2：
// main（）
...
std :: ofstream fout;
fout.open（" hello.out"）;
fout<< setfill（'' - ''）<< setw（20）<<" - "<< setfill（''''）<< endl;
fout<<" ;你好; //这是第139行
...
main.cxx：89：从这里实例化
main.cxx： 139：错误：ISO C ++说这些都是模棱两可的，即使是
虽然第一个最差的转换比第二个最差的转换
更好：
/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/
ostream.tcc：735：注意：候选人1：std :: basic_ostream< char，_Traits>&
std :: operator<<（std :: basic_ostream< char，_Traits>& ，const char *）[with
_Traits = std :: char_traits< char>]
Domain.h：507：注意：候选人2：o& operator<<（o&，const Domain&）
[with o = std :: ofstream]
make：*** [main.o]错误1
谢谢大家！
a2
Hello, does anyone have a clue about this error? and how to solve it?
It seems to be trivial to me, but not for the compiler. I''m using g++
4.2 on an Ubuntu Linux system:
// main()
...
std::ofstream fout;
fout.open("hello.out");
fout<<setfill(''-'')<<setw(20)<<"-"<<setfill('' '')<<endl;
fout<<"hello "; // this is line 139
...
main.cxx:89: instantiated from here
main.cxx:139: error: ISO C++ says that these are ambiguous, even
though the worst conversion for the first is better than the worst
conversion for the second:
/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/
ostream.tcc:735: note: candidate 1: std::basic_ostream<char, _Traits>&
std::operator<<(std::basic_ostream<char, _Traits>&, const char*) [with
_Traits = std::char_traits<char>]
Domain.h:507: note: candidate 2: o& operator<<(o&, const Domain&)
[with o = std::ofstream]
make: *** [main.o] Error 1
Thank you all!
a2
a你的程序编译的最小版本并创建一个文件，在运行后
''你好''：
#include< fstream>
int main（）
{
std :: ofstream fout;
fout.open（" hello.out"）;
fout<<" hello";
fout.close（）;
返回0;
}
您是否在代码中包含第一行？
a minimal version of your program compiles and creates a file contianing
''hello '' after running:
#include <fstream>
int main()
{
std::ofstream fout;
fout.open("hello.out");
fout<<"hello ";
fout.close();
return 0;
}
did you include the first line in your code?
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