c++ cdi+示例

C ++中的本地類 (Local Class in C++)

In C++, generally a class is declared outside of the main() function, which is global for the program and all functions can access that class i.e. the scope of such class is global.

在C ++中，通常在main()函數外部聲明一個類，該類對于程序是全局的，并且所有函數都可以訪問該類，即此類的范圍是全局的。

A local class is declared inside any function (including main() i.e. we can also declare a class within the main() function) and the scope of local class is local to that function only i.e. a local class is accessible within the same function only in which class is declared.

本地類在任何函數內聲明(包括main()，即我們也可以在main()函數內聲明一個類)，并且本地類的范圍僅對該函數本地，即本地類只能在同一函數內訪問在哪個類中聲明。

Example:

例：

Here, we are declaring and defining two classes "Test1" and "Test2", "Test1" is declared inside a user-defined function named testFunction() and "Test2" is declares inside the main() function.

在這里，我們聲明并定義了兩個類“ Test1”和“ Test2” ，在一個名為testFunction()的用戶定義函數中聲明了“ Test1”，在main()函數中聲明了“ Test2” 。

Since classes "Test1" and "Test2" are declared within the functions, thus, their scope will be local to those functions. Hence, "Test1" and "Test2" are local classes in C++.

由于在函數中聲明了“ Test1”和“ Test2”類，因此它們的作用域對于這些函數而言是局部的。 因此， “ Test1”和“ Test2”是C ++中的本地類 。

Program:

程序：

#include <iostream> using namespace std;//A user defined function void testFunction(void) {//declaring a local class//which is accessible within this function onlyclass Test1{private:int num;public:void setValue(int n){num = n;}int getValue(void){return num;}};//any message of the functioncout<<"Inside testFunction..."<<endl;//creating class's objectTest1 T1;T1.setValue(100);cout<<"Value of Test1's num: "<<T1.getValue()<<endl; }//Main function int main() {//declaring a local class//which is accessible within this function onlyclass Test2{private:int num;public:void setValue(int n){num = n;}int getValue(void){return num;}};//calling testFunctioncout<<"Calling testFunction..."<<endl;testFunction();//any message of the functioncout<<"Inside main()..."<<endl;//creating class's objectTest2 T2;T2.setValue(200);cout<<"Value of Test2's num: "<<T2.getValue()<<endl;return 0; }

Output

輸出量

Calling testFunction... Inside testFunction... Value of Test1's num: 100 Inside main()... Value of Test2's num: 200

翻譯自: https://www.includehelp.com/cpp-programs/local-class-with-example.aspx

c++ cdi+示例

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