Added a new method to extra::future (unwrap) + a test

src/libextra/future.rs

@@ -60,6 +60,19 @@ impl<A:Clone> Future<A> {
  }
 }
 
+impl<A> Future<A> {
+ /// Gets the value from this future, forcing evaluation.
+ pub fn unwrap(self) -> A {
+ let mut this = self;
+ this.get_ref();
+ let state = replace(&mut this.state, Evaluating);
+ match state {
+ Forced(v) => v,
+ _ => fail!( "Logic error." ),
+ }
+ }
+}
+
 impl<A> Future<A> {
  pub fn get_ref<'a>(&'a mut self) -> &'a A {
  /*!
@@ -179,6 +192,12 @@ mod test {
  assert_eq!(f.get(), ~"fail");
  }
 
+ #[test]
+ fn test_interface_unwrap() {
+ let mut f = from_value(~"fail");
+ assert_eq!(f.unwrap(), ~"fail");
+ }
+
  #[test]
  fn test_get_ref_method() {
  let mut f = from_value(22);