Question

我收到一个编译错误，说'左'和'右'是不明确的。

我是否向左，右边错误地宣布了？

在main中声明无效
移动功能定义在main之上没有帮助

我该如何解决这个问题？

最低测试用例：

#include <iostream>
using namespace std;
int left = 0, right = 0;
int main()
{
    cout << left;
    cout << right;
}

正在给予：

prog.cpp: In function ‘int main()’:
prog.cpp:6:13: error: reference to ‘left’ is ambiguous
prog.cpp:3:5: error: candidates are: int left
In file included from /usr/include/c++/4.7/ios:43:0,
                 from /usr/include/c++/4.7/ostream:40,
                 from /usr/include/c++/4.7/iostream:40,
                 from prog.cpp:1:
/usr/include/c++/4.7/bits/ios_base.h:918:3: error:
             std::ios_base& std::left(std::ios_base&)
prog.cpp:7:13: error: reference to ‘right’ is ambiguous
prog.cpp:3:15: error: candidates are: int right
In file included from /usr/include/c++/4.7/ios:43:0,
                 from /usr/include/c++/4.7/ostream:40,
                 from /usr/include/c++/4.7/iostream:40,
                 from prog.cpp:1:
/usr/include/c++/4.7/bits/ios_base.h:926:3: error:
             std::ios_base& std::right(std::ios_base&)

Answer 1

观察错误消息：

raw.cpp:105: error: reference to ‘right’ is ambiguous
raw.cpp:5: error: candidates are: int right
/usr/include/c++/4.2.1/bits/ios_base.h:917: error:
   std::ios_base& std::right(std::ios_base&)

阅读令人生畏，但基本上这就是它所说的：

raw.cpp:105: error: There's more than one ‘right’ here
One of them is yours: raw.cpp:5  int right
Another one isn't: <bits/ios_base.h:917>: some crap in namespace ‘std’

所以left和right已在namespace std中定义，您要导入using namespace std。这就是你有歧义的原因。修复它的最简单的更改是删除using namespace std;并添加using std::cin; using std::cout;，但这看起来像我的口味太多全局变量。

顺便说一下，您应该将代码合并到您的问题中。问题可能比粘贴时间更长，如果没有人能看到整个问题，我的答案就没有意义了。

编译错误：左边含糊不清，右边含糊不清

1 个答案: