initializer element is not con

"initializer element is not constant" 意思是初始化元素不是常量。这通常表示在定义静态变量时，初始值不是常量表达式。这可能是因为你在初始化器中使用了函数调用或其他非常量值。

相关问题

initializer element is not constant 547 | static time_t oteim = time(NULL)

"Initializer element is not constant" 这个错误提示意味着你在初始化变量时，试图设置一个非常量表达式。在C/C++中，静态成员变量（如`static time_t oteim = time(NULL)`）需要在编译期间就确定其初始值，因此它们必须是常量表达式。

在你提供的例子中，`time(NULL)`返回的是当前时间的动态值，它是运行时才会确定的，所以无法直接作为静态成员变量的初始值。为了初始化静态成员变量，你应该给它一个静态的、编译时常量值，而不是依赖于函数的返回结果。

正确的做法可能是先在某个地方计算并存储这个值，然后将其赋给静态变量，例如：

// 在某个函数中
static time_t oteim = calculate_initial_time();

// 或者如果不能提前计算，你可以考虑使用全局变量
time_t oteim;

void initialize_oteim() {
    oteim = time(NULL);
}

这样就不会出现“Initializer element is not constant”的错误了。

vue BMap is not defined

The error "BMap is not defined" usually occurs when the BMap object from the Baidu Maps JavaScript API is not properly imported or initialized in a Vue project.

To resolve this error, make sure you have properly imported the Baidu Maps JavaScript API and initialized the BMap object before using it in your Vue component.

Here are the steps you can follow:

1. Install the Baidu Maps JavaScript API package via npm or yarn:

   npm install bmap-gl

or

   yarn add bmap-gl

2. In your Vue component, import the BMap object from the bmap-gl package:

   import { BMapGL } from 'bmap-gl'

3. Initialize the BMap object in the `mounted` or `created` lifecycle hook of your Vue component:

   mounted() {
     // Initialize BMap object
     const BMap = window.BMapGL // or just window.BMap if you are using the previous version
     this.map = new BMap.Map('map-container')
   }

4. Make sure you have a container element with the id `map-container` in your template where you want to render the map:

   <template>
     <div id="map-container"></div>
   </template>

By following these steps, you should be able to fix the "BMap is not defined" error and use Baidu Maps in your Vue project successfully.