解析错误：语法错误，第10行/home/a9550001/public_html/ih_lomake/libs/password.php中的意外“{”

Question

我正在使用具有php 5.2的000webhosting。我收到以下错误： 解析错误：语法错误，第10行/home/a9550001/public_html/ih_lomake/libs/password.php中的意外“{”

整个代码是：

#include <iostream>
#include <vector>

class base_class
{
   public:
      //base_class(){};
      base_class(double a, double b){a_=a; b_=b;}
   private:
      double a_, b_;
};

class derived_class // <--- no more inheritance (and thus wrong class name)
{
   public:
      derived_class(int dim) : vector_object(dim, base_class(0,1)){};
      std::vector<base_class> print_vector_object() {return vector_object;}
   private:
      std::vector<base_class> vector_object;
};


int main()
{
  int dim = 3;
  derived_class abc(3);
  std::cout << abc.print_vector_object().size() << std::endl;
  return 0;
}