C++ 错误 C2061：语法错误：标识符
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error C2061: syntax error : identifier
提问by DungLe
Here is my C++ code
这是我的 C++ 代码
// XuatChuoiBTHang.h
#pragma once
#include "BieuThuc.h"
#include "BieuThucHang.h"
class XuatChuoiBTHang
{
public:
virtual string xuatChuoi(BieuThucHang* btHang) = 0;
};
// BieuThucHang.h
#pragma once
#include "bieuthuc.h"
#include "XuatChuoiBTHang.h"
class BieuThucHang : public BieuThuc
{
private:
XuatChuoiBTHang* xuatChuoiBTHang;
};
Ouput is:
输出为：
"error C2061: syntax error : identifier 'BieuThucHang' "
“错误 C2061：语法错误：标识符 'BieuThucHang'”
How to fix it ?
如何解决？
回答by Alok Save
You have a circular dependency of header files. You need to break this circular inclusion dependency by
using a forward declaration in XuatChuoiBTHang.h:
你有头文件的循环依赖。您需要通过在 中使用前向声明来打破这种循环包含依赖XuatChuoiBTHang.h：
class BieuThucHang;
Also, remove #include "BieuThucHang.h"from XuatChuoiBTHang.h.
此外，#include "BieuThucHang.h"从XuatChuoiBTHang.h.
