[boost] Re: Formal Review Minmax

From: Gennadiy Rozental (gennadiy_at_[hidden])
Date: 2002-10-02 01:39:44

Hi,

My general opinion that the submission should be accepted. Though it may
require some polishing.

Here my review for the submission.

=====================================================
Design/Interface

In general I agree with you algorithm design and proposed simple function
interface. Though I am not sure how functions like
last_min_first_max_element are useful.

=====================================================
Implementation

1. if (comp(b,a)) return std::make_pair(b,a);
   else return std::make_pair(a,b);

Why not: return comp(b,a) ? std::make_pair(b,a) : std::make_pair(a,b);
If should be ok since your both arguments are of the same type.

2. I agree with your point that no need to make an interface policy based.
But this does not mean that we need to repeat  the implementation 8 times
with only slight change. All algorithms first/last_max/min_element could be
implemented in terms of one generic algorithm. The same could be done (but a
little bit more difficult) with first/last_min_first/last_max_element. Look
onto attached file. Second generic algorithms is not implemented for all
cases. It almost of top of my head, but you should get the idea.

3. I implemented looping in last_min_last_max a bit differently. I believe
it could save you at least one comparison and more elegant in general (IMO).

=====================================================
Code

1. Statements like if( a ) b; better to write in a form:
if( a )
   b;
Particulaly, it simplify debugging, cause you have separate line for
breakpoint;

2. min_result = second, potential_min_result = first;
I would prefer regular block with 2 statements.

3. The best code marker for clarity is .. empty line.
IMO you lack empty lines between statements.

4. template <class ForwardIter>
I would prefer: template <typename ForwardIter>

=====================================================
Example

Well. This is not an example. It's huge and difficult to understand. This is
the best way to scare first-timer. We need several trivial examples that
show basic usage of the algorithms. Current example may become second test
module.

=====================================================
Testing
You test does not compile with MSVC6.5. I made several changes to make it
compile and pass. Problems arose with your using of reverse_iterator (I
switched to use boost::reverse_iterator), our old enemy template<typename T>
foo(), that incorrectly linked by MSVC and iterator_traits for pointer that
are not specialized due to lack of partial specialization. Also you should
not be using old BOOST_TEST tool. You would be better off with
BOOST_CHECK_EQUAL in most cases and BOOST_CHECK. Look onto attached file.
Also you should name the file minmax_test.cpp

I am attaching modified minimal.hpp and minimal.cpp. It compiles and passes
all tests with MSVC6.5.

Gennadiy.

begin 666 minmax.cpp
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end

begin 666 minmax.hpp
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