初始化結構中的函數指針

Question

typedef struct foo{ 
    void (*del)(void *toDel); 
    char* (*p)(void *tp) 
} Foo; 

Foo init(char* (*print)(void*),void (*delFunc)(void*)); 

試圖找出如何分配或初始化提供給struct函數指針的參數。

Answer 1

Foo init(char* (*print)(void *toBePrinted),void (*delFunc)(void *toBeDeleted)) 
{ 
    return Foo{ .del = delFunc, .p = print}; 
} 

這個是什麼？龍形態：

Foo init(char* (*print)(void *toBePrinted),void (*delFunc)(void *toBeDeleted)) 
{ 
    Foo tmp = { 
     .del = delFunc, 
     .p = print 
    }; 
    return tmp; 
} 

Answer 2

How to initialize a struct in accordance with C programming language standards

你可以做到這一點的常用方法：

Return (Foo){.del=delFunc, .p=print}; 

Answer 3

的直線前進（最向後兼容的方法）來定義foo爲Foo並初始化它：

Foo foo = { /* Mind the order of the following initialisers! */ 
    delFunc, 
    print 
};