相互引用的结构 [英] Structs that reference each other

问题描述

我有两个需要相互引用的结构，无论我先放哪个都会抛出错误，因为我使用的是未识别的类型.

I have two structs that need to reference each other, however whichever one I put first throws and error because I am using an unidentified type.

typedef struct _BLOCK
{
    int size;
    int offset;
    struct _BLOCK *nextBlock;
    struct _BLOCK *prevBlock;
    Pool* parent;  //here
} Block;

typedef struct _POOL
{
    int size;
    void* memory;
    Block* Allocated;
    Block* Unallocated;
} Pool;

有什么办法可以解决这个问题吗?

any ways to resolve this?

推荐答案

可以使用前置声明.

typedef struct _POOL Pool;

typedef struct _BLOCK
{
    int size;
    int offset;
    struct _BLOCK *nextBlock;
    struct _BLOCK *prevBlock;
    Pool* parent;
} Block;

struct _POOL
{
    int size;
    void* memory;
    Block* Allocated;
    Block* Unallocated;
};

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