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core: add result::unwrap() .. patch from @nmatsakis

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This commit is contained in:
Jeff Olson 2012-05-02 16:19:30 -07:00 committed by Brian Anderson
parent 3d8f7d644b
commit 082a95a077
1 changed files with 15 additions and 0 deletions
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15
src/libcore/result.rs
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@ -216,6 +216,21 @@ fn iter2<S,T,U:copy>(ss: [S], ts: [T],
ret ok(()); ret ok(());
} }
#[doc="
Unwraps a result, assuming it is an `ok(T)`
This operation is unsafe.
"]
fn unwrap<T, U>(-res: result<T, U>) -> T unsafe {
let addr = alt res {
ok(x) { ptr::addr_of(x) }
err(_) { fail "option none" }
};
let liberated_value = unsafe::reinterpret_cast(*addr);
unsafe::forget(res);
ret liberated_value;
}
#[cfg(test)] #[cfg(test)]
mod tests { mod tests {
fn op1() -> result::result<int, str> { result::ok(666) } fn op1() -> result::result<int, str> { result::ok(666) }