title: What is assignment via curly braces called? and can it be controlled?
body: <p>What is this called?</p>
  
  <pre><code>Vec3 foo = {1,2,3};
  </code></pre>
  
  <p>Can it be controlled via an operator or some such? As in can I specify how this should act?</p>
  
  <p>For instance if I had some complicated class could I use this to assign variables? (Just an exercise in curiosity).</p>