https://www.programiz.com/c-programming/c-pointer-functions https://www.tutorialspoint.com/cprogramming/c_pointers.htm https://man7.org/linux/man-pages/man2/reboot.2.html When to usereinterpret_cast? https://stackoverflow.com/questions/573294/when-to-use-reinterpret-cast...
returnType(*my_function(int, ...))(parameterTypes); (example code) As acast(but try not to cast functions): ... (returnType(*)(parameterTypes))my_expression ... (example code) As afunction pointer typedef: typedef returnType(*typeName)(parameterTypes); ...
c) int **a; // A pointer to a pointer to an integer d) int a[10]; // An array of 10 integers e) int *a[10]; // An array of 10 pointers to integers f) int (*a)[10]; // A pointer to an array of 10 integers g) int (*a)(int); // A pointer to a function a ...
As a return value from a function: returnType (*my_function(int, ...))(parameterTypes); (example code) As a cast (but try not to cast functions): ... (returnType (*)(parameterTypes))my_expression ... (example code) As a function pointer typedef: typedef returnType (*typeName)(...
当然,直接把声明定义和初始化写在一起也可以,只是平常不多见这么写:int (*a)() = function; 和上面先声明再赋值是等价的。 调用 函数指针的变量,可以当做函数名一样被调用,所以直接:a();就相当于调用了函数。 注意这是声明的一个函数指针的变量,和函数的声明有所区别。
int(*funcPtr)(); //funcPtr is short for 'function pointer'/函数指针 //或者我们也可以这么写,如果你需要一个静态的函数指针 int (*const funcPtr)(); 另外,对于 const int(*funcPtr),意思是这个指针指向的函数的返回值是常量 把一个函数赋值给函数指针 int foo() { return 5; } int goo() {...
type variable_name = _Static_cast<type>(expression); 例如: inta =10; floatb = _Static_cast<float>(a);// 将整数a转换为浮点数b 函数类型转换 将一个函数指针转换为另一个类型的指针。 // 语法格式; type (*function_name)(args) = (type (*)(args))expression; ...
classCMyClass{public:explicitCMyClass(intiBar)throw(){ }staticCMyClassget_c2(); };intmain(){ CMyClass myclass =2;// C2440// try one of the following// CMyClass myclass{2};// CMyClass myclass(2);int*i;floatj; j = (float)i;// C2440, cannot cast from pointer to int to ...
now the UnsafeMutablePointer<Void> just means we have a pointer to "something". To cast the pointer such that the compiler at runtime can access the methods associated with our SwiftOpenGLView, we use an unsafeBitCast. The definition of which states, "Returns the the bits of x, interpreted...
ctypes.cast(obj, type)This function is similartothe cast operatorinC. It returns a newinstanceoftypewhich pointstothe same memory block as obj.typemust be a pointer type,andobj must be an object that can be interpreted as a pointer. ...