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[Lib] rand.rs: type rng now defines next_float

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This commit is contained in:
David Rajchenbach-Teller 2011-10-17 14:44:29 +02:00 committed by Brian Anderson
parent eba88ef3ea
commit a85e035038
1 changed files with 8 additions and 0 deletions
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8
src/lib/rand.rs
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@ -14,6 +14,7 @@ native "rust" mod rustrt {
type rng =
obj {
fn next() -> u32;
fn next_float() -> float;
};
resource rand_res(c: rustrt::rctx) { rustrt::rand_free(c); }
@ -21,6 +22,13 @@ resource rand_res(c: rustrt::rctx) { rustrt::rand_free(c); }
fn mk_rng() -> rng {
obj rt_rng(c: @rand_res) {
fn next() -> u32 { ret rustrt::rand_next(**c); }
fn next_float() -> float {
let u1 = rustrt::rand_next(**c) as float;
let u2 = rustrt::rand_next(**c) as float;
let u3 = rustrt::rand_next(**c) as float;
let scale = u32::max_value() as float;
ret ((u1 / scale + u2) / scale + u3) / scale;
}
}
ret rt_rng(@rand_res(rustrt::rand_new()));
}