These are two different concepts, you cannot compare them. What the difference between the skunk and the moonlight? Null pointer is a special reserved value of a pointer. A pointer of any type has such a reserved value. Formally, each specific pointe…

http://stackoverflow.com/questions/3523145/pointer-arithmetic-for-void-pointer-in-c When a pointer to a particular type (say int, char, float, ..) is incremented, its value is increased by the size of that data type. If a void pointer which points to…

delete void pointer是否会有内存泄漏? 看下面一个简单例子 class Test{ public: Test(){ printf ("constructor\n"); } ~Test(){ printf("destructor"); } }; int main(int argc, char *argv[]) { Test *p = new Test(); void *p1 = p; delete p1; printf("the end\n…

Heka 编译安装后 运行报错 panic: runtime error: cgo argument has Go pointer to Go pointer 解决办法: 1.  Start hekad with the GODEBUG variable exported in its environment: export GODEBUG=cgocheck=0 2. 之后出现如下报错,找不到lua文件 2017/01/16 10:33:38 Decoder 'MemStats-MemStats…

一.野指针 “野指针”不是NULL指针,是指向“垃圾”内存的指针. “野指针”的成因主要有三种: (1)指针变量没有被初始化.任何指针变量刚被创建时不会自动成为NULL指针,它的缺省值是随机的,它会乱指一气.所以,指针变量在创建的同时应当被初始化,要么将指针设置为NULL,要么让它指向合法的内存.例如     char *p = NULL;     char *str = (char *) malloc(100); (2)指针p被free或者delete之后,没有置为NULL,让人误以为p是个合…

更多参考:http://www.embeddedrelated.com/usenet/embedded/show/31646-1.php 一: The calling convention described in this section is the one used by gcc, not the native MIPS compiler, which uses a more complex convention that is slightly faster. Figure 6: Lay…

In this article we are learning about “void pointers” in C language. Before going further it will be good if you refresh about pointers by reading – Introduction to pointers in C. A pointer variable is usually declared with the data type of the “cont…

Declaration of variables   C++ is a strongly-typed language, and requires every variable to be declared with its type before its first use. This informs the compiler the size to reserve in memory for the variable and how to interpret its value. The s…

原地址 http://www.cplusplus.com/doc/tutorial/pointers/ Pointers In earlier chapters, variables have been explained as locations in the computer's memory which can be accessed by their identifier (their name). This way, the program does not need to care…

Type system[edit] Main articles: Data type, Type system, and Type safety A type system defines how a programming language classifies values and expressions into types, how it can manipulate those types and how they interact. The goal of a type system…