Re: We do not use C++ exceptions
Seungbeom Kim <musiphil@bawi.org> wrote:
Tony wrote:
"Le Chaud Lapin" <jaibuduvin@gmail.com> wrote:
Well, I do think it is OK for constructors to throw. The best
example in my project is what you might call an IP address. It
can construct itself from a string representation:
struct IP_Address
{
IP_Address (const char *); // throws bad_argument
// 64 other member functions
} ;
It looks to me like the throw should be a simple assertion
(precondition argument checks are assertions rule). No exceptions
needed: it's development-time problem, not a runtime one.
Suppose you write a program that takes an IP address from the user.
How do you ensure that the user input is always valid? Before
calling the constructor? Then we're back to the double testing
problem.
I don't think assert is the right one to use here.
Is the constructor's job to validate user input, construct an IP_Address
object or both? If your answer is the latter, then I think you need to
brush up on the single responsibility principle...
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