小编Bra*_*lko的帖子

我在代码中遇到了特定功能的终生问题.我正在学习Rust和SDL的教程.该教程稍微陈旧,SDL库自编写以来已经发生了变化,所以我一直在跟进,同时也适应最新版本的Rust-SDL.

终身问题在于这个功能:

pub fn ttf_str_sprite(&mut self, text: &str, font_path: &'static str, size: i32, color: Color) -> Option<Sprite> {
    if let Some(font) = self.cached_fonts.get(&(font_path, size)) {
        return font.render(text).blended(color).ok()
            .and_then(|surface| self.renderer.create_texture_from_surface(&surface).ok())
            .map(Sprite::new)
    }
    //::sdl2_ttf::Font::from_file(Path::new(font_path), size).ok()
    self.ttf_context.load_font(Path::new(font_path), size as u16).ok()
        .and_then(|font| {
            self.cached_fonts.insert((font_path, size), font);
            self.ttf_str_sprite(text, font_path, size, color)
    })
}

尤其是线路self.ttf_context.load_font(Path::new(font_path), size as u16).ok().上面的注释行是旧的SDL版本的字体加载方法.

error[E0495]: cannot infer an appropriate lifetime for autoref due to conflicting requirements
  --> src\phi/mod.rs:57:26
   |
57 |         self.ttf_context.load_font(Path::new(font_path), size as u16).ok()
   |                          ^^^^^^^^^
   |
help: consider …