std.locale

[Walter Bright]

Sean Kelly wrote:
> Why should contracts be limited to parameter checking of internally used
> functions only?  If I write a function and document parameter constraints
> then I certainly expect those constraints to be followed regardless of
> whether I'm calling the function or someone else is calling the function.
> Checking these via a contract simply provides an optional means of
> ensuring that a logic error didn't occur within the program as a whole.
> 
> If you're talking about application input however, then I agree completely.
> ie. stuff typed in by the user, read from a file, etc, should never be validated
> within a contract because an input failure at that level doesn't represent
> a program logic error but rather user error.  An assertion failure isn't
> a terribly good way of notifying the user that they shouldn't have put an
> alphabetic character in a box intended to receive an integer :-)

Your "users" are anyone external to your built binary. That means that 
dll's should not use contracts to validate arguments passed to the dll's 
entry points.

If you're doing a library to be statically linked, it is debatable, and 
a decision you (as the library developer) need to make.