Article View: comp.std.c++
Article #3976Re: C++ syntactic trap
From: J. Kanze
Date: Wed, 10 Apr 1996 11:20
Date: Wed, 10 Apr 1996 11:20
39 lines
2500 bytes
2500 bytes
In article <4kcrhk$aj1@hermes.acs.unt.edu> johnw@jove.acs.unt.edu (John
R. Williams) writes:
[Concerning a warning for `new char( 10 )'...]
|> I agree that it is uusual to allocate a single object of a built-in type
|> this way, but how do you propose to write this in such a way that such a
|> warning would not be generated? All I can think of is to warn when *any*
|> conversion occurs (this one looks pretty explicit to me), forcing you to
|> write something like this:
|> char *foo = new char(static_cast<char>(10));
|> (Actually this rule doesn't seem too bad if applied only to built-in
|> types...)
Let's see:
int* pi = new int( static_cast< int >( 10 ) ) ;
Do you want the compiler to warn if you omit the static_cast (of int to
int)?
I do not think that I have a single instance of allocation of an array
in any of my code. Why should you make the most frequent case the most
difficult. (And allocating a single int is not that infrequent. You
might look at the implementation of counted_ptr in Barton and Nackman,
for example. It is certainly more frequent than allocating an array of
int's, at least in well written C++ code.)
--
James Kanze (+33) 88 14 49 00 email: kanze@gabi-soft.fr
GABI Software, Sarl., 8 rue des Francs Bourgeois, 67000 Strasbourg, France
Conseils en informatique industrielle --
-- Beratung in industrieller Datenverarbeitung
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From: kanze@gabi-soft.fr (J. Kanze) Message-ID: <KANZE.96Apr10111924@gabi.gabi-soft.fr> X-Original-Date: 10 Apr 1996 09:19:24 GMT Path: arc1-ca.pugleaf.net!in2.uu.net!bounce-back Date: 10 Apr 96 11:20:18 GMT Approved: fjh@cs.mu.oz.au Newsgroups: comp.std.c++ Subject: Re: C++ syntactic trap Organization: GABI Software, Sarl. References: <4k3q4p$lkd@syn.cs.cornell.edu> <4kcrhk$aj1@hermes.acs.unt.edu> In-Reply-To: johnw@jove.acs.unt.edu's message of 09 Apr 1996 09:59:37 PDT X-Auth: PGPMoose V1.1 PGP comp.std.c++ iQBFAgUBMWuZeeEDnX0m9pzZAQGp6gF9FTRRzKNjaQDcCSyx5MxUUkU4gK+UwlQ8 PCoLabRUVxGZcWdxBvXaT2Wx6UzgGoxp =vQPl