The Right Approach to Exceptions

Jonathan M Davis jmdavisProg at
Sun Feb 19 14:54:36 PST 2012

On Sunday, February 19, 2012 11:13:46 Robert Jacques wrote:
> Most of Phobos is an internal library. I think parsing routines are a bad
> counter-example to my point; combined validation and conversion is
> generally part of their mandate and we expect them to fail often. We also
> don't expect the parsing of user input to live deep inside code base; it's
> almost always done as close to the input as possible (i.e. in the input
> text box). All too often you end up with code like: try{ parse(...); }
> catch {...} Also, although less of a problem in D,

It very much depends on the function. In some cases, it makes the most sense 
to use assertions. In others, it makes the most sense to use exceptions. You 
have to examine it on a case-by-case basis. For instance, most of 
std.algorithm asserts on stuff, whereas the unicode stuff generally enforces.

> not ensuring that in
> input string actually is a string was the source of many a C exploits.

That may be, but that really doesn't apply to D aside from how you should be 
interacting with C functions that involve char*.

- Jonathna M Davis

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