相关疑难解决方法(0)

我来自Python / Ruby / JavaScript背景。我了解指针的工作原理，但是，我不确定在以下情况下如何利用指针。

假设我们有一个虚构的Web API，该API搜索一些图像数据库并返回一个JSON，该JSON描述在找到的每个图像中显示的内容：

[
    {
        "url": "https://c8.staticflickr.com/4/3707/11603200203_87810ddb43_o.jpg",
        "description": "Ocean islands",
        "tags": [
            {"name":"ocean", "rank":1},
            {"name":"water", "rank":2},
            {"name":"blue", "rank":3},
            {"name":"forest", "rank":4}
        ]
    },

    ...

    {
        "url": "https://c3.staticflickr.com/1/48/164626048_edeca27ed7_o.jpg",
        "description": "Bridge over river",
        "tags": [
            {"name":"bridge", "rank":1},
            {"name":"river", "rank":2},
            {"name":"water", "rank":3},
            {"name":"forest", "rank":4}
        ]
    }
]

我的目标是在Go中创建一个数据结构，该数据结构会将每个标签映射到如下所示的图像URL列表：

{
    "ocean": [
        "https://c8.staticflickr.com/4/3707/11603200203_87810ddb43_o.jpg"
    ],
    "water": [
        "https://c8.staticflickr.com/4/3707/11603200203_87810ddb43_o.jpg",
        "https://c3.staticflickr.com/1/48/164626048_edeca27ed7_o.jpg"
    ],
    "blue": [
        "https://c8.staticflickr.com/4/3707/11603200203_87810ddb43_o.jpg"
    ],
    "forest":[
        "https://c8.staticflickr.com/4/3707/11603200203_87810ddb43_o.jpg", 
        "https://c3.staticflickr.com/1/48/164626048_edeca27ed7_o.jpg"
    ],
    "bridge": [
        "https://c3.staticflickr.com/1/48/164626048_edeca27ed7_o.jpg"
    ],
    "river":[
        "https://c3.staticflickr.com/1/48/164626048_edeca27ed7_o.jpg"
    ]
}

如您所见，每个图像URL可以同时属于多个标签。如果我有成千上万个图像和更多标签，那么如果按每个标签的值复制图像URL字符串，则此数据结构会变得非常大。这是我要利用指针的地方。

我可以用Go中的两个结构来表示JSON API响应，func searchImages()模仿假API： …