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#include <iostream>
using namespace std;
 
    template <class T>
    struct clearable
    {
        void clear()
        {
            *((T*)this) = {};
        };
    };
 
    class test : public clearable<test>
    {
        public:
            int a;
    };
 
    int main()
    {
        test _test;
        _test.a=3;
        _test.clear();
 
        printf("%d", _test.a);
 
        return 0;
    }
 

prog.cpp: In member function 'void clearable<T>::clear()':
prog.cpp:9:28: warning: extended initializer lists only available with -std=c++11 or -std=gnu++11
             *((T*)this) = {};
                            ^
prog.cpp: In function 'int main()':
prog.cpp:25:29: error: 'printf' was not declared in this scope
         printf("%d", _test.a);
                             ^
prog.cpp: In instantiation of 'void clearable<T>::clear() [with T = test]':
prog.cpp:23:21:   required from here
prog.cpp:9:25: warning: extended initializer lists only available with -std=c++11 or -std=gnu++11
             *((T*)this) = {};
                         ^

Standard output is empty