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From: Pavol Droba (droba_at_[hidden])
Date: 2004-10-06 01:52:54
Hi, this is the review from Ross Boylan. He is not subscribed to the
list, but his review is very insightful, so I'm forwarding it here.
Regards,
Pavol
----- Forwarded message from Ross Boylan <ross_at_[hidden]> -----
Date: Tue, 05 Oct 2004 17:19:03 -0700
From: Ross Boylan <ross_at_[hidden]>
Subject: Re: Formal Review of the Smart Containers library
To: Pavol Droba <droba_at_[hidden]>, boost_at_[hidden]
Cc: ross_at_[hidden]
X-Mailer: Ximian Evolution 1.4.6
[I am not subscribed to the boost developers' list, so I'm not sure if
this message will appear there.]
My review is from a non-expert user perspective. Overall, I think the
library should be accepted, though I have some suggested tweaks and
improvements. I am also unable to get a program using the library to
compile, and that definitely should be fixed if I haven't made a silly
mistake. There is one substantive area (incompatibility with some
standard algorithms) that is a bit worrisome to me, and merits thought
by someone wiser.
I used the library (ptr_vector, ptr_set, ptr_map, including nested
ptr_maps) in a pre-release form in my application. There were some
minor compilation issues with that version, which I worked around, and
which I assume Thorsten has fixed. My main motivations for using the
library were that I was looking for a way to hide the implementation
decision of whether I had containers of objects or pointers, and I had
objects that were not copyable (and would have been expensive to copy).
Even at that early stage, I found the documentation quite complete and
extensive. The library was easy to use, and it worked.
COMPILATION TROUBLES
I got the version of the code in the review notice, and adjusted my code
to use it (some directory names changed). I got a raft of errors,
attached. I spent about 15 minutes looking into the first one, and have
no immediate explanation for it. I verified that my boost 1.31
libraries have a remove_pointer.hpp file under type_traits.
g++ (GCC) 3.3.4 (Debian 1:3.3.4-7)
boost 1.31.0-7
Under Debian GNU/Linux. The packages on the system are mostly at the
"testing" level, which is slated to become the next release when it's
fully cooked.
STANDARD REVIEW QUESTIONS
I have not studied the design and implementation in any detail, and so
have no comments on them. Actually, some of my comments on the
documentation really bear on the design. My major concern is that some
algorithms are not safe to use on these containers. It is not clear to
me that the average user can tell exactly which algorithms there are.
If the latter is true, and there is any way to remedy it, it would be
very good to do so. I think if this risky area is properly documented,
it will be an acceptable risk. I favor a design with maximum
compatibility with existing standard containers; it seems to me that has
been achieved.
The documentation is extensive and quite good. I have many comments,
which I will give below. The only point I consider really significant
is that some of the reference material is a bit hard to navigate (I
actually found the earlier version I looked at a bit clearer in this
regard).
The library seems quite useful to me, though I'm biased since I needed
it :) But it seems to me the features of the library are of pretty
broad interest, and they address issues likely to be handled with
ad-hoc, partial hacks without the library. I think the current
introduction could give more emphasis two significant advantages of the
library. First, it can do things that aren't easily done at all with
other methods, such as smart pointers. Second, it is conceptually very
simple, and provides a very nice abstraction. (Both of these things are
discussed early on; this is just a question of emphasis).
I did try to use the library, both an earlier version and the current
review version. See results discussed at the top of this note.
I've spent around a day, maybe more, using the library, studying the
docs, and writing this review. As noted at the outset, I only went into
the implementation details when I needed to figure out how something
worked or debug a problem. Offsetting this signficant amout of time is
my non-expertise in these matters!
I am fairly knowledgeable as a consumer of standard library containers.
I am not so knowledgeable about writing template libraries. I usually
proceed in blissful ignorance of the exception safety issues that
concerned the author.
As noted at the start, I think overall the library should be accepted,
after assuring the compilation issues are worked out. You might
consider some of the documentation issues. I would also recommend those
with greater expertise consider the implications and possible solutions
to the breakage of some standard algorithms.
DETAILED DOCUMENTATION COMMENTS
Here are my comments while reading through the documentation, including
answers to some of the issues raised for reviewers in the
documentation. I have prefaced individual points with *, and ** for
more important ones.
file:/usr/local/src/boost/boost/libs/smart_container/doc/smart_container.html
*The date at the top lacks a year.
* Might be useful to break this page into several distinct pages.
* At the very beginning, it might be worth saying that the containers
of smart pointers don't work at all if the objects are not Assignable
or Copy Constructible. This is mentioned a few paragraphs down, but
someone reading the description quickly might think the only benefit
of the library is that it offers a more optimal solution to some
problems. In fact, it lets you do things you couldn't otherwise do
(easily). In case you can't tell, this was a major reason I used the
library.
* Reference to polymorphic class problem is puzzling in two ways.
First, the section on the problem does not seem to state the problem
directly (apparently it is how to ensure proper clean up of objects
when we refer to them with pointers to a base class; perhaps it is
also the fact that one can't have a list of such types directly, but
need to use pointers). I had not heard of the problem and it doesn't
seem like such a problem. Second, it's not clear to me what smart
containers add to this particular problem, given that smart pointers
are available. It is true that this library does offer one solution
to the problem (if I have understood it correctly). Perhaps if the
introduction that now says "In this respect the library is intended to
solve the so-called polymorphic class problem." said "The library also
offers a solution to the so-called polymorphic class problem." It
would be clearer.
* Calling this the "smart container" library and then using names like
"ptr_xxx" seems an invitation to confusion. "smart_xxx" would be more
natural. At this point, it may be too much trouble and possibility
for error to change the names, even if you agree with this point.
* In the first example, in English the sound of a cow is usually
rendered as "Moooh!".
* Still in that example, the use of "stable" got me thinking about
stable vs unstable. In particular a "stable_type" is not a
polymorphic type. I wasn't actually confused, and probably no one
else will be, but it did generate a little cognitive interference.
You might use "barn" instead of "stable".
* do we want the tricky algorithms implemented as members?
Not clear to me if to_remove in example 8 is supposed to be something
in the container, or if it just needs to be equivalent (I assume the
latter, by analogy with existing stuff in the standard library). Will
incorrect semantics or errors result from naive use of the
corresponding non-member operators? Apparently so, according to later
discussion.
** I found it a bit difficult to find reference information. First,
the material requires a fair number of clicks to reach. Second, it
was not clear to me where to look for information that was not in a
given entry. There are several reasons for this.
The "see also" heading mixes material you must look at (base classes and
pseudo-base classes such as reversible_smart_container) and classes that
are simply related (e.g. ptr_vector and ptr_array). So it took me
awhile to find the definition for auto_type used in, e.g., ptr_array.
If you could distinguish inheritance relations from others, that would
be good. I'm sure part of the problem is that some of the material is
only a conceptual inheritance, but still it would be useful to know
that, for example, ptr_vector has the protocols of
ptr_sequence_adapter, which in turn has the protocols of
reversible_smart_container.
Also, there are notations like "Exception safety: strong guarantee".
A link or further explanation would be useful for those who aren't
familiar with these terms.
* The first FAQ item probably saved me a lot of grief.
** The unsafe mutating algorithms, in the FAQ now, probably deserves
more prominence, in a discussion (in the main documentation) of what
algorithms are appropriate to use with these containers. This item
makes me nervous. First, it sounds as if only an implementor of a
library would know which algorithms actually moved things around by
swapping. This leaves the average user unsure of which algorithms are
safe. Second, it seems like asking for trouble for it to be so easy
to cause problems.
* FAQ on inserting member function overloading for pointer and
reference. Reviewer Q: do we want this behavior? I would say
definitely, as it reduces the chances for user error.
* Acknowledgements: perhaps "crappy" lacks the elevated tone we seek?
And, though I assume it's a good-natured jest, some might take it the
wrong way.
Review Issues:
4. Is the indirected predicates the right solution?
It was exactly what I was looking for, so I'm inclined to say yes :)
5. Should SmartContainer::auto_type expose itself as a move_ptr?
Probably; the current name seems derived from the way it's implemented
(auto_ptr, I assume). But if it has auto_ptr semantics, and it's
important for the user to be aware of those, it's probably best to
leave it as is.
6. Should iterator range versions of assign() and insert be replaced by
an Boost.Range version? Ie, should we have
template< class SinglePassRange >
void insert( const Range& r );
instead of
template< class InputIterator >
void insert( InputIterator f, InputIterator l );
??
The more this class can behave like any std::container, the better.
So I'd lean toward leaving it as is. However, if the Boost.Range
thing is compatible (I'm not familar with it), this argument loses
force.
7. Should we remove rbegin()/rend()? Boost.Range makes these
unnecessary.
Same as 6.
8. Should we add const_begin()/const_end() etc to the classes. Again,
Boost.Range means we don't need to define them.
As these are not in the standard, I don't think adding them is
important. In fact, one could argue that adding things not in other
containers may confuse users, if they think that learning the
interface for one container class gives them protocols they can
transfer to others. In plainer language, if this library provided
const_begin, people might assume std::vector did as well.
9. Should we add iterators for traversing the keys of a map? This would
mean we could say
map::key_iterator b = m.begin(), e = m.end();
copy( b, e, some_where );
That would be useful.
10. should transfer() return iterator or iterator/bool pair like
erase()/insert() do.
I vote for returning an iterator to the start of the inserted
sequence, and throwing exceptions if things go wrong.
11. should a templated map::insert() be defined:
template< class Convertible2Key >
void insert( Convertible2Key&, T* r );
? This would allow usage like
m.insert( "foo", new Foo );
Probably not. It might create unintended conversions, and it's
probably better to leave it the client if they want this kind of
behavior.
12. should we provide member algorithms for unsafe standard
algorithms like unique() and remove?
Yes.
13. Is the shared_ptr idea described in future directions a good idea?
I'm not sure I grasp the concept well enough to comment, but it seems
to me it kind of muddies the waters. That is, shared pointers are a
different kind of ownership concept than this library, and I suspect
it will be cleaner to keep them separate. I mean, mostly, cleaner for
users.
--
Ross Boylan wk: (415) 502-4031
530 Parnassus Avenue (Library) rm 115-4 ross_at_[hidden]
Dept of Epidemiology and Biostatistics fax: (415) 476-9856
University of California, San Francisco
San Francisco, CA 94143-0840 hm: (415) 550-1062
make[1]: Entering directory `/home/ross/peter/R/mspath/src/debugTest'
g++ -I /home/ross/peter/R/mspath/src -I/usr/lib/R/include -MMD -MF /home/ross/peter/R/mspath/src/depends/Path.d -MP -g -O0 -c -o Path.o /home/ross/peter/R/mspath/src/trueSrc/Path.cc
g++ -I /home/ross/peter/R/mspath/src -I/usr/lib/R/include -MMD -MF /home/ross/peter/R/mspath/src/depends/PathGenerator.d -MP -g -O0 -c -o PathGenerator.o /home/ross/peter/R/mspath/src/trueSrc/PathGenerator.cc
g++ -I /home/ross/peter/R/mspath/src -I/usr/lib/R/include -MMD -MF /home/ross/peter/R/mspath/src/depends/SimpleRecorder.d -MP -g -O0 -c -o SimpleRecorder.o /home/ross/peter/R/mspath/src/trueSrc/SimpleRecorder.cc
g++ -I /home/ross/peter/R/mspath/src -I/usr/lib/R/include -MMD -MF /home/ross/peter/R/mspath/src/depends/SuccessorGenerator.d -MP -g -O0 -c -o SuccessorGenerator.o /home/ross/peter/R/mspath/src/trueSrc/SuccessorGenerator.cc
g++ -I /home/ross/peter/R/mspath/src -I/usr/lib/R/include -MMD -MF /home/ross/peter/R/mspath/src/depends/StateTimeClassifier.d -MP -g -O0 -c -o StateTimeClassifier.o /home/ross/peter/R/mspath/src/trueSrc/StateTimeClassifier.cc
g++ -I /home/ross/peter/R/mspath/src -I/usr/lib/R/include -MMD -MF /home/ross/peter/R/mspath/src/depends/TestRecorder.d -MP -g -O0 -c -o TestRecorder.o /home/ross/peter/R/mspath/src/trueSrc/TestRecorder.cc
In file included from /home/ross/peter/R/mspath/src/boost/smart_container/ptr_set.hpp:23,
from /home/ross/peter/R/mspath/src/trueSrc/TestRecorder.h:11,
from /home/ross/peter/R/mspath/src/trueSrc/TestRecorder.cc:6:
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:22: error: parse
error before `<' token
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:25: error: ISO
C++ forbids declaration of `value_type' with no type
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:25: error: parse
error before `;' token
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp: In
member function `void boost::ptr_set_adapter<Set,
CloneManager>::transfer(typename PtrContainer::iterator, PtrContainer&)':
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:252: error: parse
error before `;' token
In file included from /home/ross/peter/R/mspath/src/trueSrc/TestRecorder.cc:6:
/home/ross/peter/R/mspath/src/boost/smart_container/detail/associative_smart_container.hpp: At
global scope:
/home/ross/peter/R/mspath/src/boost/smart_container/detail/associative_smart_container.hpp: In instantiation of `boost::detail::associative_smart_container<boost::set_config<std::set<mspath::Path*, boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >, boost::heap_clone_manager>':
mspath.web:4864: instantiated from `boost::ptr_set_adapter_base<std::set<mspath::Path*, boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> >, boost::heap_clone_manager>'
mspath.web:4864: instantiated from `boost::ptr_set_adapter<std::set<mspath::Path*, boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> >, boost::heap_clone_manager>'
mspath.web:4864: instantiated from `boost::ptr_set<mspath::Path, boost::ptr_less<mspath::Path>, boost::heap_clone_manager>'
mspath.web:4864: instantiated from here
/home/ross/peter/R/mspath/src/boost/smart_container/detail/associative_smart_container.hpp:39: error: no
type named `key_type' in `struct boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >'
/home/ross/peter/R/mspath/src/boost/smart_container/detail/associative_smart_container.hpp:102: error: no
type named `key_type' in `struct boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp: In instantiation of `boost::ptr_set_adapter_base<std::set<mspath::Path*, boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> >, boost::heap_clone_manager>':
mspath.web:4864: instantiated from `boost::ptr_set_adapter<std::set<mspath::Path*, boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> >, boost::heap_clone_manager>'
mspath.web:4864: instantiated from `boost::ptr_set<mspath::Path, boost::ptr_less<mspath::Path>, boost::heap_clone_manager>'
mspath.web:4864: instantiated from here
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:61: error: no
type named `key_type' in `class
boost::detail::associative_smart_container<boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >,
boost::heap_clone_manager>'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:84: error: no
type named `key_type' in `class
boost::detail::associative_smart_container<boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >,
boost::heap_clone_manager>'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:90: error: no
type named `key_type' in `class
boost::detail::associative_smart_container<boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >,
boost::heap_clone_manager>'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:96: error: no
type named `key_type' in `class
boost::detail::associative_smart_container<boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >,
boost::heap_clone_manager>'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:101: error: no
type named `key_type' in `class
boost::detail::associative_smart_container<boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >,
boost::heap_clone_manager>'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:107: error: no
type named `key_type' in `class
boost::detail::associative_smart_container<boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >,
boost::heap_clone_manager>'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:113: error: no
type named `key_type' in `class
boost::detail::associative_smart_container<boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >,
boost::heap_clone_manager>'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:119: error: no
type named `key_type' in `class
boost::detail::associative_smart_container<boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >,
boost::heap_clone_manager>'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:125: error: no
type named `key_type' in `class
boost::detail::associative_smart_container<boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >,
boost::heap_clone_manager>'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:133: error: no
type named `key_type' in `class
boost::detail::associative_smart_container<boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >,
boost::heap_clone_manager>'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:141: error: no
type named `key_type' in `class
boost::detail::associative_smart_container<boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >,
boost::heap_clone_manager>'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:150: error: no
type named `key_type' in `class
boost::detail::associative_smart_container<boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >,
boost::heap_clone_manager>'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp: In instantiation of `boost::ptr_set_adapter<std::set<mspath::Path*, boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> >, boost::heap_clone_manager>':
mspath.web:4864: instantiated from `boost::ptr_set<mspath::Path, boost::ptr_less<mspath::Path>, boost::heap_clone_manager>'
mspath.web:4864: instantiated from here
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:180: error: no
type named `key_type' in `class
boost::ptr_set_adapter_base<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> >,
boost::heap_clone_manager>'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:223: error: no
type named `key_type' in `class
boost::ptr_set_adapter_base<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> >,
boost::heap_clone_manager>'
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:228: error: no
type named `key_type' in `class
boost::ptr_set_adapter_base<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> >,
boost::heap_clone_manager>'
mspath.web: In member function `virtual
boost::indirect_iterator<std::_Rb_tree_iterator<mspath::Path*, mspath::Path*
const&, mspath::Path* const*>, boost::use_default, boost::use_default,
boost::use_default, boost::use_default>
mspath::TestRecorder::PathSet::insertUnique(mspath::Path*)':
mspath.web:5319: error: no matching function for call to `
mspath::TestRecorder::PathSet::insert(mspath::Path* const&)'
/home/ross/peter/R/mspath/src/boost/smart_container/detail/reversible_smart_container.hpp:449: error: candidates
are: void boost::detail::reversible_smart_container<Config,
CloneManager>::insert(typename Config::iterator, typename
Config::container_type::size_type, typename Config::value_type&) [with
Config = boost::set_config<std::set<mspath::Path*,
boost::ptr_less<mspath::Path>, std::allocator<mspath::Path*> > >,
CloneManager = boost::heap_clone_manager]
/home/ross/peter/R/mspath/src/boost/smart_container/detail/reversible_smart_container.hpp:444: error:
typename Config::iterator
boost::detail::reversible_smart_container<Config,
CloneManager>::insert(typename Config::iterator, typename
Config::value_type&) [with Config =
boost::set_config<std::set<mspath::Path*, boost::ptr_less<mspath::Path>,
std::allocator<mspath::Path*> > >, CloneManager = boost::heap_clone_manager]
/home/ross/peter/R/mspath/src/boost/smart_container/detail/reversible_smart_container.hpp:432: error:
typename Config::iterator
boost::detail::reversible_smart_container<Config,
CloneManager>::insert(typename Config::iterator, typename
Config::value_type*) [with Config =
boost::set_config<std::set<mspath::Path*, boost::ptr_less<mspath::Path>,
std::allocator<mspath::Path*> > >, CloneManager = boost::heap_clone_manager]
mspath.web: In member function `virtual void
mspath::TestRecorder::PathSet::transferUnique(boost::indirect_iterator<std::_Rb_tree_iterator<mspath::Path*,
mspath::Path* const&, mspath::Path* const*>, boost::use_default,
boost::use_default, boost::use_default, boost::use_default>,
mspath::TestRecorder::PathSet&)':
mspath.web:5332: error: no matching function for call to `find(mspath::Path&)'
mspath.web: In member function `virtual void
mspath::TestRecorder::goodPath(const mspath::Path&)':
mspath.web:5287: error: `find' undeclared (first use this function)
mspath.web:5287: error: (Each undeclared identifier is reported only once for
each function it appears in.)
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp: In
member function `void boost::ptr_set_adapter<Set,
CloneManager>::transfer(typename PtrContainer::iterator, PtrContainer&)
[with PtrContainer = mspath::TestRecorder::PathSet, Set =
std::set<mspath::Path*, boost::ptr_less<mspath::Path>,
std::allocator<mspath::Path*> >, CloneManager = boost::heap_clone_manager]':
mspath.web:5335: instantiated from here
/home/ross/peter/R/mspath/src/boost/smart_container/ptr_set_adapter.hpp:254: error: `
p' undeclared (first use this function)
dî@: In function `_InputIter std::find(_InputIter, _InputIter, const _Tp&)
[with _InputIter = __gnu_cxx::__normal_iterator<const
mspath::TestRecorder::GeneratorState*,
std::vector<mspath::TestRecorder::GeneratorState,
std::allocator<mspath::TestRecorder::GeneratorState> > >, _Tp =
mspath::TestRecorder::GeneratorState]':
mspath.web:5414: instantiated from here
dî@:256: error: `<declaration error>' is not a function,
/usr/include/c++/3.3/bits/stl_algo.h:293: error: conflict with `
template<class _InputIter, class _Tp> _InputIter std::find(_InputIter,
_InputIter, const _Tp&)'
/usr/include/c++/3.3/bits/stl_algo.h:298: error: in call to `find'
make[1]: *** [TestRecorder.o] Error 1
make[1]: Leaving directory `/home/ross/peter/R/mspath/src/debugTest'
make: *** [test] Error 2
----- End forwarded message -----
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