using struct pointer before declaration

[Serve Laurijssen]

How can I get the following to compile?

typedef struct Y
{
void (*f)(X *x);
} Y;

typedef struct X
{
int x;
} X;

Just forward declaring X doesn't work and I can't put the word struct before
X, because the code is generated.

 

[Eric]

typedef struct Y
{
void (*f)(X *x);
} Y;

typedef struct X
{
int x;
} X;

Did you try:

typedef struct X
{
int x;
} X;

typedef struct Y
{
void (*f)(X *x);
} Y;

?

Famous last words: Works for me.

 

[Eric Sosman]

How can I get the following to compile?

typedef struct Y
{
void (*f)(X *x);
} Y;

typedef struct X
{
int x;
} X;

Just forward declaring X doesn't work and I can't put the word struct before
X, because the code is generated.

The only way to get the code to compile as it stands
is to use a compiler for some non-C language.

An obvious way to fix it is to move the declaration of
`X' so it appears before the first use. But since you say
that another obvious fix isn't allowable, it's not clear
that this fix is applicable, either.

Fixing the program that generates the code is another
possibility.

 

[Pieter Droogendijk]

How can I get the following to compile?

typedef struct Y
{
void (*f)(X *x);
} Y;

typedef struct X
{
int x;
} X;

You probably mean a solution like this:

typedef struct Y Y;
typedef struct X X;

struct Y {
void (*f)(X *x);
};

struct X {
int x;
};

 

[Nick Austin]

How can I get the following to compile?

typedef struct Y
{
void (*f)(X *x);
} Y;

typedef struct X
{
int x;
} X;

You could just swap the order of both typedefs. Or:

struct X;
typedef struct X X;

typedef struct Y
{
void (*f)(X *x);
} Y;

struct X
{
int x;
};

Nick.

 

[Arthur J. O'Dwyer]

This certainly looks like it's working. I don't mean to be an ass, but
it is correct C right?

Yes.

 

[Jarno A Wuolijoki]

The only way to get the code to compile as it stands
is to use a compiler for some non-C language.
Fixing the program that generates the code is another
possibility.

Hmmm.. generalizing:

generatecode foo.almostc
fixcode foo.almostc foo.c
cc foo.c

The two first lines are the fixed generator and the last
two a non-C compiler.

 

[Emmanuel Delahaye]

How can I get the following to compile?

typedef struct Y
{
void (*f)(X *x);
} Y;

typedef struct X
{
int x;
} X;

Just forward declaring X doesn't work and I can't put the word struct
before X, because the code is generated.

Sounds obvious, but wat's wrong with:

typedef struct
{
int x;
}
X;

typedef struct
{
void (*f)(X *x);
}
Y;