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use core::char;
use core::mem;
use {Rand, Rng};
impl Rand for isize {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> isize {
if mem::size_of::<isize>() == 4 {
rng.gen::<i32>() as isize
} else {
rng.gen::<i64>() as isize
}
}
}
impl Rand for i8 {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> i8 {
rng.next_u32() as i8
}
}
impl Rand for i16 {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> i16 {
rng.next_u32() as i16
}
}
impl Rand for i32 {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> i32 {
rng.next_u32() as i32
}
}
impl Rand for i64 {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> i64 {
rng.next_u64() as i64
}
}
impl Rand for usize {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> usize {
if mem::size_of::<usize>() == 4 {
rng.gen::<u32>() as usize
} else {
rng.gen::<u64>() as usize
}
}
}
impl Rand for u8 {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> u8 {
rng.next_u32() as u8
}
}
impl Rand for u16 {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> u16 {
rng.next_u32() as u16
}
}
impl Rand for u32 {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> u32 {
rng.next_u32()
}
}
impl Rand for u64 {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> u64 {
rng.next_u64()
}
}
macro_rules! float_impls {
($mod_name:ident, $ty:ty, $mantissa_bits:expr, $method_name:ident) => {
mod $mod_name {
use {Rand, Rng, Open01, Closed01};
const SCALE: $ty = (1u64 << $mantissa_bits) as $ty;
impl Rand for $ty {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> $ty {
rng.$method_name()
}
}
impl Rand for Open01<$ty> {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> Open01<$ty> {
Open01(rng.$method_name() + 0.25 / SCALE)
}
}
impl Rand for Closed01<$ty> {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> Closed01<$ty> {
Closed01(rng.$method_name() * SCALE / (SCALE - 1.0))
}
}
}
}
}
float_impls! { f64_rand_impls, f64, 53, next_f64 }
float_impls! { f32_rand_impls, f32, 24, next_f32 }
impl Rand for char {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> char {
const CHAR_MASK: u32 = 0x001f_ffff;
loop {
if let Some(c) = char::from_u32(rng.next_u32() & CHAR_MASK) {
return c;
}
}
}
}
impl Rand for bool {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> bool {
rng.gen::<u8>() & 1 == 1
}
}
macro_rules! tuple_impl {
($($tyvar:ident),* ) => {
impl<
$( $tyvar : Rand ),*
> Rand for ( $( $tyvar ),* , ) {
#[inline]
fn rand<R: Rng>(_rng: &mut R) -> ( $( $tyvar ),* , ) {
(
$(
_rng.gen::<$tyvar>()
),*
,
)
}
}
}
}
impl Rand for () {
#[inline]
fn rand<R: Rng>(_: &mut R) -> () {
()
}
}
tuple_impl!{A}
tuple_impl!{A, B}
tuple_impl!{A, B, C}
tuple_impl!{A, B, C, D}
tuple_impl!{A, B, C, D, E}
tuple_impl!{A, B, C, D, E, F}
tuple_impl!{A, B, C, D, E, F, G}
tuple_impl!{A, B, C, D, E, F, G, H}
tuple_impl!{A, B, C, D, E, F, G, H, I}
tuple_impl!{A, B, C, D, E, F, G, H, I, J}
tuple_impl!{A, B, C, D, E, F, G, H, I, J, K}
tuple_impl!{A, B, C, D, E, F, G, H, I, J, K, L}
impl<T: Rand> Rand for Option<T> {
#[inline]
fn rand<R: Rng>(rng: &mut R) -> Option<T> {
if rng.gen() { Some(rng.gen()) } else { None }
}
}