soft and program: comp.lang.c++ - 25 new messages in 17 topics

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* Proposal: More flexible comparisons - 4 messages, 3 authors
http://groups.google.com/group/comp.lang.c++/t/0666c63287aacf90?hl=en
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==============================================================================
TOPIC: Proposal: More flexible comparisons
http://groups.google.com/group/comp.lang.c++/t/0666c63287aacf90?hl=en
==============================================================================

== 1 of 4 ==
Date: Sat, Jun 27 2009 12:16 am
From: "robertwessel2@yahoo.com"

On Jun 25, 6:34 am, Ioannis Vranos <ivra...@freemail.gr> wrote:
> Proposal:
>
> I think the following simple approach will provide great flexibility in conditions.
>
> The style:
>
> 1.
>
> if(1<x<4)
> // ...
>
> 2.
>
> if(1<x<4 and 3<=y<=5 and z>1)
> // ...

While it has some merit, it doesn't appear to work very well in
practice. Take a look at Cobol, which has done that since the sixties
(although they did change how some of the complex combinations are
interpreted in COBOL-74). Most coding standards prohibit the use of
those forms, for pretty good reason - while simple case are not too
bad, it's very easy to generate statements that are very hard to
interpret (for humans).

== 2 of 4 ==
Date: Sat, Jun 27 2009 1:48 am
From: Juha Nieminen

Fred Zwarts wrote:
>> Also overloading the comparison operators could become interesting
>> with the proposed semantics. You could end up with some really
>> obfuscated code along the lines of "if(a<b><c> d)".
>>
>> I wouldn't want to write a lexer for that.
>
> Would that be more complex then it is with the current meaning?

Can you currently write something like "a<b><c> d" so that it's
syntactically and semantically correct?

== 3 of 4 ==
Date: Sat, Jun 27 2009 1:56 am
From: Juha Nieminen

Hendrik Schober wrote:
> Victor Bazarov wrote:
>> [...] You already can do
>>
>> #define is ^
>> #define in Interval
>> ...
>> if (4 is in (1, 10))
>> ...
>>
>> Preprocessor is not always your enemy.
>
> Except that this wreaks havoc with code like this
> std::istream& operator<<(std::istream& is, const T& o);
> which isn't really uncommon.

Preprocessor macros messing up things is a relatively common problem.
For example, some versions of the C++ standard library implementation in
MSVC defined min() and max() as macros. This naturally caused havoc
anywhere you wanted to use those names, such as:

namespace
{
MyType min(MyType a, MyType b) { return ...; }
}

I once used an enumerated constant named NO_ERROR (inside a class) in
a library I made. Someone reported that this caused problems with some
version of Borland C++ because some library in that compiler defined
that name as a preprocessor macro.

== 4 of 4 ==
Date: Sat, Jun 27 2009 2:23 am
From: Ioannis Vranos

There can't be any solution for this, since the

a< b< c< d

expression is currently evaluated from left to right (as usual) and it is equivalent to:

((a<b)<c)<d

which is no the expected normal notion.

If we introduce any notion that does the mathematical meaning, even this someone else suggested:

x E [1, 4]

or something similar like

x= [1,4]

x=[1,4)

e.t.c.

there will be confusion with the current evaluation of

1<x<=4

which currently is evaluated to (1<x)<=4.

However although controversial, I think the committee can force a fix on the issue and break the incorrect
notion when more than one comparison operators are present, to the correct mathematical meaning, as they did
break the notion of the largest built-in signed/unsigned integral types, with the introduction of the
unnecessary long long/unsigned long long integral types.

--
Ioannis A. Vranos

C95 / C++03 Developer

http://www.cpp-software.net

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