考虑到程序员编码的方便性，标准规定了五花八门的 export 语法。如下所示
// Export everything within the block.
export
{
  int some_number = 123;
  
  class foo
  {
  public:
    void invoke() { }
  private:
    int count_ = 0;
  };
}

// Export namespace.
export namespace demo::test
{
  struct tIPS
  {
    int abc;
  }
  
  void free_func() { }
}

// Export a free function.
export void here_is_a_function() { }

// Export a global variable.
export int global_var = 123;

// Export a class.
export class test
{
  
};

可以export 模板吗？
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