title: Find a specific tuple element in a vector of tuples?
body: <p>I am having an issue with finding a tuple element, in a vector of tuples. </p>
  
  <p>I have a <code>vector&lt;tuple&lt;int,int,int,int&gt;&gt;</code> in which I need to find the position in the vector where <code>get&lt;0&gt;(vector) = 0</code>.  I need the position, as I need to extract the other values from the tuple in that position as well. </p>
  
  <p>The value of <code>get&lt;0&gt;</code> is unique and will only occur once in the vector. </p>
  
  <p>How do I do that?</p>