restore stdout is not wroking

See more:

C++

Linux

Please take a look at this sample code.

#include <iostream>
#include <string>
class output_trick{
        public:
                output_trick(){
                        std::cout<<"output start here"<<std::endl;
                }
                ~output_trick(){
                        std::cout<<"output end here"<<std::endl;
                }
};
int main()
{
        freopen("x.txt","wb", stdout);
        output_trick *o=new output_trick();
        delete o;
        fclose(stdout);
        stdout = fdopen(STDOUT_FILENO, "w");
        std::cout<<"let's see where it goes"<<std::endl; //expecting this line to go to console. but not going
        return 0;
}

I was expecting line 19 will print the data on console but it goes no where. where I went wrong?