函数声明一般是这样: int fun(int, double); 对应函数指针 (pointer to function)的声明是这样:int (*pf)(int, double);可以这样使用:pf = 2、&fun; / 赋值(assignment操作(*pf)(5, 8.9);/函数调用操作也请注意,C语言本身 提供了一种简写方式如下:pf = fun; /赋值(assignment操作pf(5, 8.9); /...
这样,就可以用my_struct_t代替struct my_struct来引用这个结构体。同时,也可以用my_struct_ptr_t代替struct my_struct *来定义指向结构体的指针类型: typedefstructmy_struct{intx;floaty;}my_struct_t;typedefstructmy_struct*my_struct_ptr_t; 这样,就可以使用my_struct_t和my_struct_ptr_t来代替冗长的struc...
A a = &c; /* 会有Warning: initialization from incompatible pointer type */ [例7] typedef struct _Foo_t Foo_t; 分析: 去掉typedef ,得到正常变量声明 => struct _Foo_t Foo_t; 变量Foo_t的类型为struct _Foo_t; => "typedef struct _Foo_t Foo_t"中Foo_t是"struct _Foo_t"的一个typede...
The typePGis declared as a pointer to theGROUPtype, which in turn is defined as a structure type. C typedefvoidDRAWF(int,int); This example provides the typeDRAWFfor a function returning no value and taking two int arguments. It means, for example, that the declaration ...
Dp dptr; <=> dptr是一个pointer to double的变量 [例3] typedef int* Func(int); 分析: 去掉typedef ,得到正常变量声明=> int* Func(int); 变量Func的类型为一个函数标识符,该函数返回值类型为int*,参数类型为int; => "typedef int* Func(int)"中Func是函数类型(函数返回值类型为int*,参数类型为int...
A a = &c; /* 会有Warning: initialization from incompatible pointer type */ [例7] typedef struct _Foo_t Foo_t; 分析: 去掉typedef ,得到正常变量声明 => struct _Foo_t Foo_t; 变量Foo_t的类型为struct _Foo_t; => "typedef struct _Foo_t Foo_t"中Foo_t是"struct _Foo_t"的一个typede...
struct tnode *right; /* right child */ } Treenode; This creates two new type keywords called Treenode (a structure) and Treeptr (a pointer to the structure). Then the routine talloc could become Treeptr talloc(void) { return (Treeptr) malloc(sizeof(Treenode)); ...
private 底下的那些，主要就是因为原类型名完整写出来太长，于是取个短名字。public 底下那些，除了名字...
// C++11 using func = void(*)(int); // C++03 equivalent: // typedef void (*func)(int); // func can be assigned to a function pointer value void actual_function(int arg) { /* some code */ } func fptr = &actual_function; 機制...
The typePGis declared as a pointer to theGROUPtype, which in turn is defined as a structure type. C typedefvoidDRAWF(int,int); This example provides the typeDRAWFfor a function returning no value and taking two int arguments. It means, for example, that the declaration ...