      <div class="declaration">
                <div class="language">
                  <pre class="highlight swift"><code><span class="kd">open</span> <span class="kd">class</span> <span class="kt">Constraint</span></code></pre>

                </div>
              </div>
            <p>Constraint: Constraints are tasks which can hold network requests from starting until they are satisfied.</p>

          </div>
        </section>

        <section class="section">
          <div class="section-content">