<p>This is a solution for <a href="https://github.com/mlpack/mlpack/pull/524" class="issue-link js-issue-link" data-url="https://github.com/mlpack/mlpack/issues/524" data-id="136250795" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#524</a>.  It actually functions about the same as that solution but creates a separate file for singletons (<code>src/mlpack/core/singletons.cpp</code>).  As a result of this change it is possible to create a program that has <code>#include &lt;mlpack/core.hpp&gt;</code> without linking against libmlpack.so, if no mlpack symbols are used.  This was not possible before.</p>

<p>I'll leave this for a couple of days before I merge it.</p>

<p><a href="https://github.com/theSundayProgrammer" class="user-mention">@theSundayProgrammer</a>: I know this took a very long time for me to get around to, but here is (finally) a solution.  Like I said it is essentially equivalent to yours, just arranged differently.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>&nbsp;&nbsp;<a href='https://github.com/mlpack/mlpack/pull/800'>https://github.com/mlpack/mlpack/pull/800</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Refactor singletons into one .cpp file.</li>
  <li>Add clarifying comment.</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/800/files#diff-0">src/mlpack/core/util/CMakeLists.txt</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/800/files#diff-1">src/mlpack/core/util/cli.cpp</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/800/files#diff-2">src/mlpack/core/util/cli_deleter.hpp</a>
    (5)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/800/files#diff-3">src/mlpack/core/util/log.cpp</a>
    (32)
  </li>
  <li>
    <strong>A</strong>
    <a href="https://github.com/mlpack/mlpack/pull/800/files#diff-4">src/mlpack/core/util/singletons.cpp</a>
    (50)
  </li>
  <li>
    <strong>A</strong>
    <a href="https://github.com/mlpack/mlpack/pull/800/files#diff-5">src/mlpack/core/util/singletons.hpp</a>
    (21)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/mlpack/mlpack/pull/800.patch'>https://github.com/mlpack/mlpack/pull/800.patch</a></li>
  <li><a href='https://github.com/mlpack/mlpack/pull/800.diff'>https://github.com/mlpack/mlpack/pull/800.diff</a></li>
</ul>

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