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// traits1.rs
// 是时候来实现些 trait 了！
//
// 你的任务是为 `String` 实现 `AppendBar` trait。
//
// `AppendBar` 只有一个函数，它将 "Bar" 追加到任何实现该 trait 的对象上。
// 译：
// I AM NOT DONE
trait AppendBar {
fn append_bar ( self ) -> Self ;
}
impl AppendBar for String {
// 在这里编写代码
}
fn main ( ) {
let s = String ::from ( "Foo" ) ;
let s = s . append_bar ( ) ;
println! ( "s: {}" , s ) ;
}
#[ cfg(test) ]
mod tests {
use super ::* ;
#[ test ]
fn is_foo_bar ( ) {
assert_eq! ( String ::from ( "Foo" ) . append_bar ( ) , String ::from ( "FooBar" ) ) ;
}
#[ test ]
fn is_bar_bar ( ) {
assert_eq! (
String ::from ( "" ) . append_bar ( ) . append_bar ( ) ,
String ::from ( "BarBar" )
) ;
}
}
