/technologies/code_exchange/b/blog/posts/modern-c-restrict-templated-types-with-conceptIn C++, templates allow you to write generic code, that can handle many types. But almost always, there will be types you can&#39;t handle. In my case, I have a callback manager that supports functions that return a void, a number, a bool or a class...en-USTelligent Community 12https://community.element14.com/technologies/code_exchange/b/blog/posts/modern-c-restrict-templated-types-with-conceptWed, 12 Mar 2025 20:08:31 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:f3b78795-50d9-40c7-9e46-3ae21e9b54caJan Cumps0<p>Analogy:</p> <p><img alt=" " height="274" src="/resized-image/__size/1000x548/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-f3b78795-50d9-40c7-9e46-3ae21e9b54ca/truckbrug.jpg" width="500" /></p> <p>source:&nbsp;<a id="" href="https://www.ajc.com/gdpr.html" rel="noopener noreferrer nofollow" target="_blank" data-e14adj="t">https://www.ajc.com/gdpr.html</a></p> <p></p> <p>Without concepts, the compiler would say: &quot;the bridge&nbsp;you are driving under&nbsp;is not suited for trucks that don&#39;t lower their load.&quot;</p> <p>With concepts: &quot;your truck will not fit under that bridge if you don&#39;t properly lower that load on the truck bed.&quot;</p><img src="https://community.element14.com/aggbug?PostID=28761&AppID=74&AppType=Weblog&ContentType=0" width="1" height="1">