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std: cleanup of rand

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This commit is contained in:
Andrew Kelley 2016-07-27 19:52:38 -07:00
parent 06c4b35eb1
commit 3eb5afd245
1 changed files with 7 additions and 9 deletions
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16
std/rand.zig
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@ -34,9 +34,9 @@ pub struct Rand {
if (T == usize) {
return r.rng.get();
} else {
var result: T = undefined;
r.fill_bytes(([]u8)((&result)[0...@sizeof(T)]));
return result;
var result: [@sizeof(T)]u8 = undefined;
r.fill_bytes(result);
return ([]T)(result)[0];
}
}
@ -44,12 +44,12 @@ pub struct Rand {
pub fn fill_bytes(r: &Rand, buf: []u8) {
var bytes_left = buf.len;
while (bytes_left >= @sizeof(usize)) {
*((&usize)(&buf[buf.len - bytes_left])) = r.scalar(usize);
([]usize)(buf[buf.len - bytes_left...])[0] = r.rng.get();
bytes_left -= @sizeof(usize);
}
if (bytes_left > 0) {
var rand_val_array : [@sizeof(usize)]u8 = undefined;
([]usize)(rand_val_array)[0] = r.scalar(usize);
([]usize)(rand_val_array)[0] = r.rng.get();
while (bytes_left > 0) {
buf[buf.len - bytes_left] = rand_val_array[@sizeof(usize) - bytes_left];
bytes_left -= 1;
@ -107,10 +107,8 @@ struct MersenneTwister(
// TODO improve compile time eval code and then allow this function to be executed at compile time.
#static_eval_enable(false)
pub fn init(seed: int) -> Self {
var mt = Self {
.index = n,
.array = undefined,
};
var mt: Self = undefined;
mt.index = n;
var prev_value = seed;
mt.array[0] = prev_value;