"https://wg21.link/P0786">WG21 <code>ValueOrError</code>
concept framework</a>.</p>

<p>Finally, we shall then step through a worked example which mocks up a realistic
situation that the software developer may find themselves in: tying
together disparate third party libraries, whose source code cannot be
modified, into an application-wide, mixed-mode <code>T|E</code> and exception
throwing universal error handling system which is capable of
accurately representing the original failure, but also propagating 