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<pre id='vimCodeElement'>
<span class="Comment">// So far we have local variables, and we can nest local variables of short</span>
<span class="Comment">// lifetimes inside longer ones. Now let's support 'global' variables that</span>
<span class="Comment">// last for the life of a routine. If we create multiple routines they won't</span>
<span class="Comment">// have access to each other's globals.</span>

<span class="Delimiter">:(scenario global_space)</span>
recipe main [
  <span class="Comment"># pretend arrays; in practice we'll use new</span>
  <span class="Constant">10</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">5</span>
  <span class="Constant">20</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">5</span>
  <span class="Comment"># actual start of this recipe</span>
  global-space:address:array:location<span class="Special"> &lt;- </span>copy <span class="Constant">20</span>
  default-space:address:array:location<span class="Special"> &lt;- </span>copy <span class="Constant">10</span>
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">23</span>
  <span class="Constant">1</span>:number/space:global<span class="Special"> &lt;- </span>copy <span class="Constant">24</span>
]
<span class="traceContains">+mem: storing 23 in location 12</span>
<span class="traceContains">+mem: storing 24 in location 22</span>

<span class="Comment">//: to support it, create another special variable called global space</span>
<span class="Delimiter">:(before &quot;End Disqualified Reagents&quot;)</span>
if <span class="Delimiter">(</span>x<span class="Delimiter">.</span>name == <span class="Constant">&quot;global-space&quot;</span><span class="Delimiter">)</span>
  x<span class="Delimiter">.</span>initialized = <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End is_special_name Cases&quot;)</span>
if <span class="Delimiter">(</span>s == <span class="Constant">&quot;global-space&quot;</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>

<span class="Comment">//: writes to this variable go to a field in the current routine</span>
<span class="Delimiter">:(before &quot;End routine Fields&quot;)</span>
long long int global_space<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End routine Constructor&quot;)</span>
global_space = <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">:(after &quot;void write_memory(reagent x, vector&lt;double&gt; data)&quot;)</span>
  if <span class="Delimiter">(</span>x<span class="Delimiter">.</span>name == <span class="Constant">&quot;global-space&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>data<span class="Delimiter">))</span>
      raise &lt;&lt; current_recipe_name<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;: 'global-space' should be of type address:array:location, but tried to write &quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>data<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    if <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>global_space<span class="Delimiter">)</span>
      raise &lt;&lt; <span class="Constant">&quot;routine already has a global-space; you can't over-write your globals&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    Current_routine<span class="Delimiter">-&gt;</span>global_space = data<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
    <span class="Identifier">return</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>

<span class="Comment">//: now marking variables as /space:global looks them up inside this field</span>
<span class="Delimiter">:(after &quot;long long int space_base(const reagent&amp; x)&quot;)</span>
  if <span class="Delimiter">(</span>is_global<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-&gt;</span>global_space<span class="Delimiter">)</span>
      raise &lt;&lt; <span class="Constant">&quot;routine has no global space</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">return</span> Current_routine<span class="Delimiter">-&gt;</span>global_space<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>

<span class="Comment">//: for now let's not bother giving global variables names.</span>
<span class="Comment">//: don't want to make them too comfortable to use.</span>

<span class="Delimiter">:(scenario global_space_with_names)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
  global-space:address:array:location<span class="Special"> &lt;- </span>new location:type<span class="Delimiter">,</span> <span class="Constant">10</span>
  x:number<span class="Special"> &lt;- </span>copy <span class="Constant">23</span>
  <span class="Constant">1</span>:number/space:global<span class="Special"> &lt;- </span>copy <span class="Constant">24</span>
]
<span class="Comment"># don't warn that we're mixing numeric addresses and names</span>
$warn: <span class="Constant">0</span>

<span class="Delimiter">:(after &quot;bool is_numeric_location(const reagent&amp; x)&quot;)</span>
  if <span class="Delimiter">(</span>is_global<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>

<span class="Comment">//: helpers</span>

<span class="Delimiter">:(code)</span>
bool is_global<span class="Delimiter">(</span>const reagent&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  for <span class="Delimiter">(</span>long long int i = <span class="Comment">/*</span><span class="Comment">skip name:type</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first == <span class="Constant">&quot;space&quot;</span><span class="Delimiter">)</span>
      <span class="Identifier">return</span> !x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == <span class="Constant">&quot;global&quot;</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
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