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Why do I need to import a trait to use the methods it defines for a type?（1个答案）
19天前关闭。
我试图做简单的结构与几个特征以下的例子在互联网上遇到了以下问题。

//My struct in framebuffer.rs
pub struct HighLevelFrameBuffer<'a> {
    pub fbinfo: FrameBufferInfo,
    pub fbdata: &'a mut [u8],
    pub pixel_bytesize: u8,
    pub color: FrameBufferColor,
}
//Trait and implementation
trait WriteLine {
    fn write_line(&self, line: usize, color: FrameBufferColor);
}
impl<'a> WriteLine for HighLevelFrameBuffer<'a> {

    fn write_line(&self, line: usize, color: FrameBufferColor) {
        //Do stuff
    }
}

当我尝试从我的主函数调用它时，如下所main.rs:

mod framebuffer;
pub use framebuffer::HighLevelFrameBuffer;
pub use framebuffer::FrameBufferColor;

let hlfb = HighLevelFrameBuffer{
    fbinfo: something,
    fbdata: data_location,
    pixel_bytesize: 0,
    color:  FrameBufferColor {r: 0, g: 0, b: 0}
};
hlfb.write_line(100, FrameBufferColor{r: 0xFF, g: 0xFF, b: 0xFF});

编译器告诉我没有实现HighLevelFrameBuffer结构的write_line：

hlfb.write_line(100, FrameBufferColor{r: 0xFF, g: 0xFF, b: 0xFF});
   |          ^^^^^^^^^^ method not found in `HighLevelFrameBuffer<'_>` 
pub struct HighLevelFrameBuffer<'a> {
   | ----------------------------------- method `write_line` not found for this struct

我在这里做错了什么？