与语法，结构混淆 [英] confused with syntax, structures

问题描述

我对以下语法感到困惑，但我读了一下它，我认为它是有效的：

I was confused with following syntax, but that I read a bit about it, I think it is valid:

typedef struct t_config
{
	u16_t   x;  
	u16_t   y; 
	u16_t   z_pdp;
} t_config, *pt_config; // What is *pt_config?? Is it a pointer? Or a type?

 
void profile_append(pt_config conf); // If what is written above is a variable, then what is pt_config??? It is written as a type here

推荐答案

这个定义意味着t_config是一个结构，而pt_config是一个指针那个结构。



以下是等效的声明：

This definition means that t_config is a struct, and pt_config is a pointer to that struct.

The following are equivalent declarations:

void profile_append(pt_config conf);
void profile_append(t_config conf*);

int p;      // p is variable of int type
int *pNo;  // pNo is a pointer variable which will point to int type

类似的方式* pt_config表示指向t_config类型的指针，即结构，即用户定义数据类型

In similar ways *pt_config means pointer to t_config type which is structure i.e. user define data type

因为它是用typedef定义的，所以 pt_config 是一个类型定义。可以把它想象成

As it is defined with a typedef, pt_config is a type definition. Think of it as

typdef   struct t_config*   pt_config;

从现在开始，您可以在所有需要类型的地方使用 pt_config ，例如在函数参数列表中：

From now on you can use pt_config in all places where a type is expected, for example in a function argument list:

void profile_append(pt_config conf);

以上声明与：

The above declaration is the same as:

void profile_append(struct t_config* conf);

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