Re: [Boost-users] nondynamic: A utility class that promotes safe programming
Ovanes wrote: [snip]
What do you think how this allocator will allocate the number of these element? Actually in any possible way. It can use new[] or new char[sizeof(T)*NumElems] or use an own mem-manager. And the worse thing you can't make allocator friend of your class, since users of containers can pass their own allocators. And despite all enumerated facts you will fail to compile, since the function address will fail to return the pointer to x, because it is prohibited in your case.
Yes, well boost::noncopyable also prohibits something :-) The whole intent of nondynamic is to prohibit (or make difficult) dynamic allocation/pointer usage. Do you think boost::noncopyable has a valid purpose, but nondynamic is less useful? -- Daniel
There are other classes that can't be used in containers such as scoped_ptr so there is precedent - stl containers aren't the be all and end all of software design.
Yes, well boost::noncopyable also prohibits something :-) The whole intent of nondynamic is to prohibit (or make difficult) dynamic allocation/pointer usage. Do you think boost::noncopyable has a valid purpose, but nondynamic is less useful?
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On Fri, Mar 28, 2008 at 1:59 PM, Patrick Loney < Patrick.Loney@interactivets.com> wrote:
There are other classes that can't be used in containers such as scoped_ptr so there is precedent - stl containers aren't the be all and end all of software design.
Yes, well boost::noncopyable also prohibits something :-) The whole intent of nondynamic is to prohibit (or make difficult) dynamic allocation/pointer usage. Do you think boost::noncopyable has a valid purpose, but nondynamic is less useful?
All applications of noncopyable are clearly defined in my opinion. In case
of nondynamic it is not so.
If I declare a class as nondynamic I still probably can assume that it is
locally copyable. Isn't is so?
So this construct should be valid:
{ //local scope
std::vector
AMDG Daniel Lidström wrote:
Ovanes wrote:
Yes, well boost::noncopyable also prohibits something :-) The whole intent of nondynamic is to prohibit (or make difficult) dynamic allocation/pointer usage. Do you think boost::noncopyable has a valid purpose, but nondynamic is less useful?
Yes. Copying objects is part of the interface of T. There are some classes for which copying does not make sense. Where T's are created is the business of users. The only even conceivable use case I see is RAII wrappers. I still don't think that it's very useful to prohibit creation on the heap, because unlike copies, C++ doesn't automatically call new for you, on the drop of a hat. In addition, trying to allocate an RAII object on the heap will not generally cause a program to go down in flames the way copying a noncopyable object can. In Christ, Steven Watanabe
participants (4)
-
Daniel Lidström -
Ovanes Markarian -
Patrick Loney -
Steven Watanabe