1. 解释“pointer of type 'void *' used in arithmetic”这个警告的含义 这个警告信息意味着在C或C++程序中,尝试对类型为void *的指针进行了算术运算。在C和C++中,void *是一个通用指针类型,表示一个通用指针,它不指向任何特定类型的数据。由于void *没有类型信息,编译器无法确定指针算术运算的单位大小(例如,...
对void* 类型的指针进行加减运算的时候,这是不安全的,因为编译器并不知道你指针的单元是多少,需要移动多长的距离。作为扩展,大部分编译器都允许给void 指针做算术运算。
As you have probably have discovered pointers of type void* can't take in pointer arithmetic - mostly because the compiler doesn't know what increment and decrement should mean as it doesn't know the size of type the pointer is pointing to. In your case though it looks as there might be...
可以初始化，但是printf那句还需要写成*((int*)a)这样编译器才知道这个地方是需要用整形指针来求值。
Otherwise, a cast operator must be used to convert the value of the pointer on the right of the assignment to the pointer type on the left of the assignment. The exception to this rule is the pointer to void (i.e., void *), which is a generic pointer capable of representing any ...
指针数组: Type *array[] 数组指针: Type (*array)[]指针函数: Type *function(void)函数指针: Type (*function)(void)函数指针数组: Type (*array[])(void)今天是20200305指针数组,数组指针,指针函数.函数指针,函数指针数组,指针的指针,多级指针你值得拥有 ...
When running make I get the following errors: ././files/tf_tensor_helper.cc:43:46: error: arithmetic on a pointer to void *(char *)(buffer_data_pointer+i) = file_string[i]; ././files/tf_tensor_helper.cc:52:56: error: arithmetic on a poin...
In an unsafe context, a type may be a pointer type, a value type, or a reference type. A pointer type declaration takes one of the following forms:复制 type* identifier; void* identifier; //allowed but not recommended Any of the following types may be a pointer type:...
Originally, it was thought that void* arithmetic was permitted, because of these sections of the C standard: 6.2.5-27: A pointer to void shall have the same representation and alignment requirements as a pointer to a character type.
This problem can be overcome by creating an array in dynamic memory. The allocated memory block will always be aligned according to whatever type is stored in it. Fixed code: void foo() { char x; BITMAPINFO *pBMI = (BITMAPINFO *) calloc(sizeof(BITMAPINFOHEADER) + 3 * sizeof(RGBQUAD...