错误C2061:语法错误:标识符

Question

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;
};

输出是:

"错误C2061:语法错误:标识符'BieuThucHang'"

怎么解决？

Answer 1

您有头文件的循环依赖.您需要通过在XuatChuoiBTHang.h以下位置使用前向声明来打破此循环包含依赖项:

class BieuThucHang;

另外,#include "BieuThucHang.h"从中删除XuatChuoiBTHang.h.