https://forge.codesys.com/forge/talk/Engineering/thread/72c52cb880/2021-11-17T21:26:37.510000ZRecent posts to Properties that return Reference Types. What are the various Behaviors?2021-11-17T21:26:37.510000Z2021-11-17T21:26:37.510000Zthecolonel26https://forge.codesys.com/u/thecolonel26/https://forge.codesys.comb0c62e720cdf5035002df2996cfafb809d09bc60

<div class="markdown_content"><p>Per the warning </p> <div class="codehilite"><pre><span></span><span class="n">C0410</span><span class="o">:</span> <span class="n">COMPATIBILITY</span> <span class="n">WARNING</span><span class="o">:</span> <span class="n">A</span> <span class="n">write</span> <span class="n">access</span> <span class="n">to</span> <span class="n">a</span> <span class="n">Property</span> <span class="n">of</span> <span class="n">type</span> <span class="n">REFERENCE</span> <span class="n">calls</span> <span class="n">the</span> <span class="n">SET</span><span class="o">-</span><span class="n">Accessor</span> <span class="k">for</span> <span class="n">versions</span> <span class="o">&lt;</span> <span class="mf">3.1</span><span class="o">.</span><span class="mf">4022.0</span> <span class="n">and</span> <span class="n">writes</span> <span class="n">the</span> <span class="n">reference</span><span class="o">,</span> <span class="n">but</span> <span class="n">calls</span> <span class="n">the</span> <span class="n">GET</span><span class="o">-</span><span class="n">Accessor</span> <span class="k">for</span> <span class="n">versions</span> <span class="o">&gt;=</span> <span class="mf">3.1</span><span class="o">.</span><span class="mf">4022.0</span> <span class="n">and</span> <span class="n">writes</span> <span class="n">the</span> <span class="n">value</span><span class="o">!</span> <span class="n">Use</span> <span class="n">the</span> <span class="n">operator</span> <span class="n">REF</span><span class="o">=</span> <span class="k">if</span> <span class="n">you</span> <span class="n">want</span> <span class="n">to</span> <span class="n">assign</span> <span class="n">the</span> <span class="n">reference</span><span class="o">.</span> </pre></div> <p>Say the Get is defined as</p> <div class="codehilite"><pre><span></span><span class="err">BlahBlahFB Ref= _blahblahFB;</span> </pre></div> <p>and the Set is defined as </p> <div class="codehilite"><pre><span></span><span class="err">_blahblahFB := BlahBlahFB;</span> </pre></div> <p><strong>What is the behavior of that vs below?</strong></p> <p>Get is defined as</p> <div class="codehilite"><pre><span></span><span class="err">BlahBlahFB := _blahblahFB;</span> </pre></div> <p>and Set is defined as </p> <div class="codehilite"><pre><span></span><span class="err">_blahblahFB := BlahBlahFB;</span> </pre></div> <p>Or Verses this?</p> <p>Get is defined as</p> <div class="codehilite"><pre><span></span><span class="err">BlahBlahFB := _blahblahFB;</span> </pre></div> <p>and Set is defined as </p> <div class="codehilite"><pre><span></span><span class="err">_blahblahFB := BlahBlahFB;</span> </pre></div> <p><strong>Does the Ref= and := no longer matter in the Set and Get definition or does it still matter?</strong></p> <p><strong>And do you actually need a Set defined? to set the reference?</strong></p></div>