mock.rs.html -- source

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arrayvec

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atty

backtrace

backtrace

libunwind.rs mod.rs

symbolize

dladdr.rs libbacktrace.rs mod.rs

capture.rs lib.rs print.rs types.rs

backtrace_sys

base64

write

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bincode

de

ser

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bitflags

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c2_chacha

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capnp_rpc

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cfg_if

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clap

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crossbeam_utils

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sync

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ctrlc

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daemon

daemon.rs lib.rs linux.rs singleton.rs

failure

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error

error_impl.rs mod.rs

as_fail.rs box_std.rs compat.rs context.rs error_message.rs lib.rs macros.rs result_ext.rs sync_failure.rs

failure_derive

flexi_logger

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getrandom

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glob

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install_service.rs

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inline_lazy.rs lib.rs

libc

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lock_api

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log

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memchr

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mio

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alphabet.rs generator.rs lib.rs random.rs

net2

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impls.rs mod.rs

ext.rs lib.rs socket.rs tcp.rs udp.rs unix.rs utils.rs

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num_integer

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ops

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bounds.rs cast.rs float.rs identities.rs int.rs lib.rs macros.rs pow.rs sign.rs

open

parking_lot

condvar.rs deadlock.rs elision.rs lib.rs mutex.rs once.rs raw_mutex.rs raw_rwlock.rs remutex.rs rwlock.rs util.rs

parking_lot_core

thread_parker

linux.rs mod.rs

lib.rs parking_lot.rs spinwait.rs util.rs word_lock.rs

pem

errors.rs lib.rs

ppv_lite86

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proc_macro2

fallback.rs lib.rs strnom.rs wrapper.rs

quote

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rand

rand_chacha

chacha.rs lib.rs

rand_core

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rand_hc

hc128.rs lib.rs

rand_isaac

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rand_jitter

dummy_log.rs error.rs lib.rs platform.rs

rand_os

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rand_pcg

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rand_xorshift

rcgen

regex

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ring

rustc_demangle

legacy.rs lib.rs v0.rs

rustls

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private

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ser

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export.rs integer128.rs lib.rs macros.rs

slab

smallvec

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stream_cancel

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strsim

syn

synstructure

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tempfile

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textwrap

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thread_local

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time

display.rs duration.rs lib.rs parse.rs sys.rs

tokio

codec

length_delimited.rs mod.rs

executor

current_thread

reactor

mod.rs poll_evented.rs

runtime

current_thread

builder.rs mod.rs runtime.rs

threadpool

builder.rs mod.rs shutdown.rs task_executor.rs

util

enumerate.rs future.rs mod.rs stream.rs

clock.rs fs.rs io.rs lib.rs net.rs prelude.rs sync.rs timer.rs

tokio_codec

bytes_codec.rs lib.rs lines_codec.rs

tokio_core

tokio_current_thread

lib.rs scheduler.rs

tokio_executor

enter.rs error.rs executor.rs global.rs lib.rs park.rs typed.rs

tokio_fs

tokio_io

tokio_reactor

background.rs lib.rs poll_evented.rs registration.rs sharded_rwlock.rs

tokio_rustls

common

mod.rs vecbuf.rs

client.rs lib.rs server.rs

tokio_sync

mpsc

block.rs bounded.rs chan.rs list.rs mod.rs unbounded.rs

task

atomic_task.rs mod.rs

lib.rs lock.rs loom.rs oneshot.rs semaphore.rs watch.rs

tokio_tcp

incoming.rs lib.rs listener.rs stream.rs

tokio_threadpool

tokio_timer

tokio_udp

frame.rs lib.rs recv_dgram.rs send_dgram.rs socket.rs

tokio_uds

datagram.rs frame.rs incoming.rs lib.rs listener.rs recv_dgram.rs send_dgram.rs stream.rs ucred.rs

unicode_width

lib.rs tables.rs

unicode_xid

lib.rs tables.rs

untrusted

vec_map

void

webpki

calendar.rs cert.rs der.rs error.rs name.rs signed_data.rs time.rs trust_anchor_util.rs verify_cert.rs webpki.rs

windows_service

x11

dpms.rs glx.rs internal.rs keysym.rs lib.rs link.rs xcursor.rs xf86vmode.rs xfixes.rs xft.rs xinerama.rs xinput.rs xinput2.rs xlib.rs xlib_xcb.rs xmd.rs xmu.rs xrandr.rs xrecord.rs xrender.rs xss.rs xt.rs xtest.rs

xcb

ffi

base.rs big_requests.rs xc_misc.rs xkb.rs xproto.rs

base.rs big_requests.rs lib.rs xc_misc.rs xkb.rs xproto.rs

xkbcommon

xkb

x11

compose.rs ffi.rs keysyms.rs mod.rs

yasna

deserializer

models

der.rs mod.rs oid.rs time.rs

reader

error.rs mod.rs

serializer

tags

writer

// Copyright 2018 Developers of the Rand project.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

//! Mock random number generator

use rand_core::{RngCore, Error, impls};

/// A simple implementation of `RngCore` for testing purposes.
/// 
/// This generates an arithmetic sequence (i.e. adds a constant each step)
/// over a `u64` number, using wrapping arithmetic. If the increment is 0
/// the generator yields a constant.
/// 
/// ```
/// use rand::Rng;
/// use rand::rngs::mock::StepRng;
/// 
/// let mut my_rng = StepRng::new(2, 1);
/// let sample: [u64; 3] = my_rng.gen();
/// assert_eq!(sample, [2, 3, 4]);
/// ```
#[derive(Debug, Clone)]
pub struct StepRng {
    v: u64,
    a: u64,
}

impl StepRng {
    /// Create a `StepRng`, yielding an arithmetic sequence starting with
    /// `initial` and incremented by `increment` each time.
    pub fn new(initial: u64, increment: u64) -> Self {
        StepRng { v: initial, a: increment }
    }
}

impl RngCore for StepRng {
    #[inline]
    fn next_u32(&mut self) -> u32 {
        self.next_u64() as u32
    }

    #[inline]
    fn next_u64(&mut self) -> u64 {
        let result = self.v;
        self.v = self.v.wrapping_add(self.a);
        result
    }

    #[inline]
    fn fill_bytes(&mut self, dest: &mut [u8]) {
        impls::fill_bytes_via_next(self, dest);
    }

    #[inline]
    fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
        self.fill_bytes(dest);
        Ok(())
    }
}