尝试在结构内初始化联合时出错

So I a function which returns a pointer to a struct (parse_files_result_t*). This struct contains a union:

struct parse_files_result_t{
    result_tag tag;
    union {
        struct parse_file_error_t *err_ptr;
        struct parse_file_response_t *ok_ptr;        
    } data;
};

And I wanted to use the union to return an *err_ptr or an *ok_ptr based on the calculations in the function.

所以我写了下面的代码：

parse_files_result_t* result = (parse_files_result_t*)malloc(sizeof (parse_files_result_t));

if (success) {        
    parse_file_response_t response = //data
    *result = parse_file_response_t{result_tag::Ok, result->data.ok_ptr = &response};
    return result;
} else {
    parse_file_error_t errorresponse = //data
    *result = parse_files_result_t{{result_tag::Err}, {result->data.err_ptr = &errorresponse}};
    return result;
}

So far so good. The else part, where a parse_file_error_t gets returned, works fine because the parse_file_error_t is the first part of the union. In the if part, I want to return only the parse_file_response_t. Because this is the second "part" of the union, I get this error:

错误：初始化时无法将“ parse_file_response_t *”转换为“ parse_file_error_t *”

Even though I wrote result->data.ok_ptr, my compiler tries to put the parse_file_response_t response into the parse_file_error_t part of the union.

我怎样才能解决这个问题？

谢谢你的帮助！