c++ - 使用枚举

Question

有一个问题我看不懂:

Types.hpp:

enum SomeEnum { one, two, three };

First.hpp:

#include "Types.hpp"
class First
{
   public: void someFunc(SomeEnum type) { /* ... */ }
};

第二个.hpp:

#include "Types.hpp"
#include "First.hpp"
class Second
{
   public: void Foo()
   {
      First obj;
      obj.someFunc(two); // two is from SomeEnum
   }
};

你的错误:

no matching function for call to ‘First::someFunc(SomeEnum)’
note: candidate is: void First::someFunc(First::SomeEnum)

Answer 1

我想你刚刚改变了:

no matching function for call to ‘First::someFunc(SomeEnum)’
note: candidate is: void First::someFunc(First::SomeEnum)

这不是吗:

no matching function for call to ‘First::someFunc(SomeEnum)’
note: candidate is: bool First::someFunc(First::SomeEnum)

无论如何，这改变了一切。枚举是在 class First 中声明的吗？如果是这样，或者如果您不知道，只需尝试调用该函数，将 First:: 放在枚举前面:

obj.someFunc( First::two ); // two is from SomeEnum
              ^^^^^^^