class declaration?

[thomas]

for the following two files, it has a problem of recursive inclusion.
Is there a mechanism like class declaration to solve the problem?

---header1.h---
#include "header2.h"

class class1{
public:
void method1(class2 &ins);
};

--header2.h---
#include "header1.h"

class class2{
class1 *ptr;
public:
...
};

 

[red floyd]

for the following two files, it has a problem of recursive inclusion.
Is there a mechanism like class declaration to solve the problem?

---header1.h---
#include "header2.h"

class class1{
public:
void method1(class2 &ins);
};

--header2.h---
#include "header1.h"

class class2{
class1 *ptr;
public:
...
};

This is a FAQ. See FAQ 39.11,
http://parashift.com/c++-faq-lite/misc-technical-issues.html#faq-39.11

 

[lnitzu]

for the following two files, it has a problem of recursive inclusion.
Is there a mechanism like class declaration to solve the problem?

---header1.h---
#include "header2.h"

class class1{
public:
void method1(class2 &ins);

};

--header2.h---
#include "header1.h"

class class2{
class1 *ptr;
public:
...

};

I think you need to use guard regions

#ifndef _XXX
#define _XXX

#include .....
....
#endif

 

[Harish]

for the following two files, it has a problem of recursive inclusion.
Is there a mechanism like class declaration to solve the problem?

---header1.h---
#include "header2.h"

class class1{
public:
void method1(class2 &ins);

};

--header2.h---
#include "header1.h"

class class2{
class1 *ptr;
public:
...

};

You can use a forward declaration in both header files

 

[Juha Nieminen]

I think you need to use guard regions

#ifndef _XXX
#define _XXX

#include .....
...
#endif

Which doesn't solve the recursive inclusion problem.

 

[Juha Nieminen]

for the following two files, it has a problem of recursive inclusion.
Is there a mechanism like class declaration to solve the problem?

---header1.h---
#include "header2.h"

class class1{
public:
void method1(class2 &ins);
};

---header1.h---
class class2;

class class1{
public:
void method1(class2 &ins);
};

--header2.h---
#include "header1.h"

class class2{
class1 *ptr;
public:
...
};

--header2.h---
class class1;

class class2{
class1 *ptr;
public:
...
};

 

[Ian Collins]

#ifndef _XXX
#define _XXX

Any symbol starting with a leading underscore and a capital letter is
reserved for the implementation, don't use them.