循环 C++ 头文件包括
在一个项目中，我有 2 个类:
In a project I have 2 classes:
//mainw.h
#include "IFr.h"
...
class mainw
{
public:
static IFr ifr;
static CSize=100;
...
};
//IFr.h
#include "mainw.h"
...
class IFr
{
public float[mainw::CSize];
};
但我无法编译此代码，在 static IFr ifr; 行出现错误.这种交叉包含是否被禁止?
But I cannot compile this code, getting an error at the static IFr ifr; line. Is this kind of cross-inclusion prohibited?
推荐答案
这种交叉包含是否被禁止?
Is this kind of cross-inclusions are prohibited?
是的.
一种变通方法是说 mainw 的 ifr 成员是一个引用或一个指针，这样前向声明就可以了，而不是包含完整的声明，例如:
A work-around would be to say that the ifr member of mainw is a reference or a pointer, so that a forward-declaration will do instead of including the full declaration, like:
//#include "IFr.h" //not this
class IFr; //this instead
...
class mainw
{
public:
static IFr* ifr; //pointer; don't forget to initialize this in mainw.cpp!
static CSize=100;
...
}
或者，在单独的头文件中定义 CSize 值(以便 Ifr.h 可以包含这个其他头文件，而不是包含 mainw.h).
Alternatively, define the CSize value in a separate header file (so that Ifr.h can include this other header file instead of including mainw.h).
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