c/c+{}コードブロックの使用

変数がコードブロック"{}"で定義されている場合、その変数の生存期間と役割ドメインはコードブロック内に制限されます.
コード#コード#

#include 

class SimpleTestClass
{
public:
    SimpleTestClass()
    {
        std::cout<<"the SimpleTestClass creates"<<std::endl;
    }
    SimpleTestClass(int id):m_id(id)
    {
        std::cout<<"the SimpleTestClass creates"<<std::endl;
        std::cout<<"the value of the private member m_id is : "<std::endl;
    }
    ~SimpleTestClass()
    {
        std::cout<<"the SimpleTestClass destroys"<<std::endl;
        std::cout<<"the value of the private member m_id is : "<std::endl;
    }  
    void TestRun()
    {
        std::cout<<"the SimpleTestClass public function is running."<<std::endl;
        std::cout<<"the value of the private member m_id is : "<std::endl;
    }
private:
    int m_id;
};

int main()
{
    SimpleTestClass object(1);
    object.TestRun();
    {
        ///       object                 ，   object           。
        ///       （          ，          ），              ，
        ///    object          ，            ，     ，        。
        SimpleTestClass object(2);
        object.TestRun();
        SimpleTestClass myobject(3);
        myobject.TestRun();
        ///          ，myobject object         ，     。
    }
    ///           ，         。
    object.TestRun();

    return 0;
}

しゅつりょく

the SimpleTestClass creates
the value of the private member m_id is : 1

the SimpleTestClass public function is running.
the value of the private member m_id is : 1

the SimpleTestClass creates
the value of the private member m_id is : 2

the SimpleTestClass public function is running.
the value of the private member m_id is : 2

the SimpleTestClass creates
the value of the private member m_id is : 3

the SimpleTestClass public function is running.
the value of the private member m_id is : 3

the SimpleTestClass destroys
the value of the private member m_id is : 3

the SimpleTestClass destroys
the value of the private member m_id is : 2

the SimpleTestClass public function is running.
the value of the private member m_id is : 1

the SimpleTestClass destroys
the value of the private member m_id is : 1