/**
 * part of Hachette
 * Facilitate listening to events
 *
 * Copyright (C) 2021 Wojtek Kosior
 * Redistribution terms are gathered in the `copyright' file.
 */

function make()
{
    return new Set();
}

function subscribe(observable, cb)
{
    observable.add(cb);
}

function unsubscribe(observable, cb)
{
    observable.delete(cb);
}

function broadcast(observable, event)
{
    for (const callback of observable)
	callback(event);
}

const observables = {make, subscribe, unsubscribe, broadcast};

/*
 * EXPORTS_START
 * EXPORT observables
 * EXPORTS_END
 */
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<div class='path'>path: <a href='/guix/log/?id=c3e5e1355b320bb3f2a6b0164af6f158b32263dd'>root</a>/<a href='/guix/log/nix?id=c3e5e1355b320bb3f2a6b0164af6f158b32263dd'>nix</a>/<a href='/guix/log/nix/libutil?id=c3e5e1355b320bb3f2a6b0164af6f158b32263dd'>libutil</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/nix/libutil?id=c3e5e1355b320bb3f2a6b0164af6f158b32263dd&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-12-16 16:28:07 +0100'>2018-12-16</span></td><td><a href='/guix/commit/nix/libutil?id=8327e733966cc4a93dfaadd1a761ca1088078baa'>daemon: Use unbranded phrases in comments and messages.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-10-02 23:08:30 +0200'>2018-10-02</span></td><td><a href='/guix/commit/nix/libutil?id=7eca7892014d173ff523417138b90aeff5b7dec1'>daemon: Remove "case hack" for nars.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-08-18 11:31:28 +0200'>2017-08-18</span></td><td><a href='/guix/commit/nix/libutil?id=ed464f48efd80e6439441d7a9f6d0e7988fb1272'>nix: Remove unused function.</a><span class='msg-avail'>...</span></td><td>Andy Wingo</td></tr>
<tr><td><span title='2016-05-31 18:22:14 +0200'>2016-05-31</span></td><td><a href='/guix/commit/nix/libutil?id=75abbd0cbe2c42f07fa104f97bd206891eb576ef'>daemon: Remove unused XML output code.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-12-02 19:37:59 +0200'>2015-12-02</span></td><td><a href='/guix/commit/nix/libutil?id=14fb686a21d786afa699a38d20929a88be6e541d'>daemon: Fix namespace issue.</a></td><td>Eelco Dolstra</td></tr>
<tr><td><span title='2015-12-02 19:37:59 +0200'>2015-12-02</span></td><td><a href='/guix/commit/nix/libutil?id=29d3242e5c428d3b0e8dc9db1c81cd4053e5271c'>daemon: Support SHA-512 hashes.</a><span class='msg-avail'>...</span></td><td>Eelco Dolstra</td></tr>
<tr><td><span title='2015-12-02 19:37:59 +0200'>2015-12-02</span></td><td><a href='/guix/commit/nix/libutil?id=79aa1a83054af1600ba235ddf305337b5df78271'>daemon: int2String -&gt; std::to_string.</a></td><td>Eelco Dolstra</td></tr>
<tr><td><span title='2015-07-03 00:30:55 +0200'>2015-07-03</span></td><td><a href='/guix/commit/nix/libutil?id=322eeb87d0e5bb608ae1c176611a50297c93cbe8'>Merge branch 'nix'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-06-03 22:59:02 +0200'>2015-06-03</span></td><td><a href='/guix/commit/nix/libutil?id=54c260e6ecc81f1836bda844ec8e661d51bfb867'>Merge branch 'nix'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-05-19 16:09:58 +0200'>2015-05-19</span></td><td><a href='/guix/commit/nix/libutil?id=2bb04905f86f9c3f1d27557fbff8cbdc776560a3'>Merge branch 'nix'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-05-19 16:09:58 +0200'>2015-05-19</span></td><td><a href='/guix/commit/nix/libutil?id=a88b8c5c985a87586159c0621974a1dfe5b9b92d'>Revert "daemon: Fix possible use-after-free."</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-05-11 23:01:20 +0200'>2015-05-11</span></td><td><a href='/guix/commit/nix/libutil?id=1303a4a4517260def862ce7fe97e6b28dd8005e1'>daemon: Fix possible use-after-free.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>