Re: [asio-users] asio and good error handling

[Bjorn R. <br...@ma...>]

On 12/28/18 5:17 AM, Vinnie Falco wrote:

> understand them). The blog posts and tutorials floating around the web
> can sometimes be a little cryptic with references to "system" errors
> and that sort of nonsense.
> 
> I find it easiest to explain error_condition as the equivalent of an
> "error group." That is, multiple distinct values of error_code can map
> to the same error_condition. This allows code which can fail to
> concisely provide the exact cause of failure (error_code) while also
> allowing the code to determine the general category of error.

As one of said blog posts succinctly states:

<quote>
     Use std::error_code for error propagation.
     Use std::error_code for comparison within a category.
     Use std::error_condition for comparison between categories.
</quote>