这对于在C/C++或任何其他需要存储函数先前状态的应用程序中实现协程非常有用。 // C++ program to demonstrate // the use of static Static // variables in a Function #include <iostream> #include <string> using namespace std; void demo() { // static variable static int count = 0; cout << ...
In the functionmyFunction()definition,varis not static, it’s alocal/automatic variablehere and it will be declared every time of program’s execution will move the function definition; that’s why on every calling ofmyFunction(), value ofvarwill be 1. ...
changes its lifetime. Changing a global variable to a static variable changes its scope and limits its use. So the role of static this descriptor is different in different places. 4. Static function ... internal and external functions
(1) a static local variable defines its lifetime in the function as the entire source, but its scope remains the same as that of the automatic variable, and can only be used within the function defining the variable. After exiting the function, you cannot use it even though it still ...
链接https://pabloariasal.github.io/2020/01/02/static-variable-initialization/ C++ - Initialization of Static Variables 02 Jan 2020 onC++ Today is the last day of the year. I’m wearing my yellow underwear; it’s a new year’s tradition in this part of the world. People say it shall ...
// Since we already have a library function to handle locking, we might // as well check for this situation and throw an exception. // We use the second byte of the guard variable to remember that we’re // in the middle of an initialization. class recursive_init: public std::excepti...
全局变量存放在程序的静态数据区，任何地方都能访问；static变量根据使用场景不同分为两种，static全局变量存在静态区，static局部变量虽然作用域受限，但也存在静态区。作用范围不同 全局变量默认具有外部链接属性，其他文件通过extern声明就能使用；static全局变量属于内部链接，只能在定义它的文件内部使用，其他文件无法访问...
[tsecer@Harry localstatic]$ gcc localstatic.c -c localstatic.c:2: error: initializer element is not constant localstatic.c: In function ‘bar’: localstatic.c:5: error: initializer element is not constant [tsecer@Harry localstatic]$ g++ localstatic.c -c ...
cout << "func_a_value => " << func_a_value << ", current function = > " << __FUNCTION__ << endl; } void func_b(int a, int b) { static int res = a + b; cout << "res => " << res << ", current thread id => " << std::this_thread::get_id() << endl; ...
external variable:具有外部连接的变量称为外部变量。具有外部链接的变量可以在其定义的文件中以及其他文件中使用。 比如: static int g_x; // g_x is static, and can only be used within this file。static修饰的全局变量,是内部变量,只能该文件里面使用 ...