Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.c++ > #4690 > unrolled thread
| Started by | asit <lipun4u@gmail.com> |
|---|---|
| First post | 2011-05-04 11:40 -0700 |
| Last post | 2011-05-05 10:05 +0800 |
| Articles | 4 — 4 participants |
Back to article view | Back to comp.lang.c++
const_cast asit <lipun4u@gmail.com> - 2011-05-04 11:40 -0700
Re: const_cast Noah Roberts <dont@email.me> - 2011-05-04 11:55 -0700
Re: const_cast Martijn van Buul <pino@dohd.org> - 2011-05-04 19:06 +0000
Re: const_cast Qi <no@no.no> - 2011-05-05 10:05 +0800
| From | asit <lipun4u@gmail.com> |
|---|---|
| Date | 2011-05-04 11:40 -0700 |
| Subject | const_cast |
| Message-ID | <f044ae2a-88f0-49c2-9f09-619cad881832@glegroupsg2000goo.googlegroups.com> |
is there any way to know if const_cast fails ??
[toc] | [next] | [standalone]
| From | Noah Roberts <dont@email.me> |
|---|---|
| Date | 2011-05-04 11:55 -0700 |
| Message-ID | <4dc1a0fa$0$2413$cc2e38e6@news.uslec.net> |
| In reply to | #4690 |
On 5/4/2011 11:40 AM, asit wrote: > is there any way to know if const_cast fails ?? It won't compile. There's actually no such thing as failing to remove constness. No, there's no way to check if doing so will turn the world inside out. -- http://crazycpp.wordpress.com
[toc] | [prev] | [next] | [standalone]
| From | Martijn van Buul <pino@dohd.org> |
|---|---|
| Date | 2011-05-04 19:06 +0000 |
| Message-ID | <slrnis38ui.1ged.pino@mud.stack.nl> |
| In reply to | #4690 |
* asit: > is there any way to know if const_cast fails ?? const_cast can't "fail", other than with a compiler error if you're casting away more than just 'const'. However, this doesn't mean that the resulting code will actually work. It may still trigger undefined behaviour, and there's no way to "detect" that at runtime. In that respect, const_cast *always* fails; you're throwing away a valuable contract, and is inherently dangerous. I suppose it is still preferable over a C-style cast, though. -- Martijn van Buul - pino@dohd.org
[toc] | [prev] | [next] | [standalone]
| From | Qi <no@no.no> |
|---|---|
| Date | 2011-05-05 10:05 +0800 |
| Message-ID | <ipt0m6$msm$1@speranza.aioe.org> |
| In reply to | #4690 |
On 2011-5-5 2:40, asit wrote: > is there any way to know if const_cast fails ?? Others had answered quite well. What I want to say is that const_cast is a compile time operator, not runtime operator. That means, if it "fails", the code won't get compiled. If the code is compiled, the operator won't fail any more at runtime. -- WQ
[toc] | [prev] | [standalone]
Back to top | Article view | comp.lang.c++
csiph-web