Re: A new programming language

James Kanze <>
Sun, 20 Mar 2011 22:37:39 CST
On Mar 18, 11:48 pm, itaj sherman <> wrote:

On Mar 18, 10:05 am, Francis Glassborow

<> wrote:

Not only is there no plan to allow code such as the above to compile in
C++, I cannot imagine that such a proposal would ever get serious
consideration in the future.

C++ is designed to allow separate compilation of translation units.
Using details of a class that have not yet been seen by the compiler
would introduce a nightmare tangle probably worse than goto.

Hmm, I always thought that it would be a good thing, that the
languages couldn't take because it would make compilation more complex
(maybe too complex for the machines of 1980?).
I mean, if the rule was that anything only has one definition
somewhere in the code-base, and the compiler has to look for it for
you (so you don't need any forward declarations).
As for organization in the code, the IDE could work it automatically I

If by "code-base", you mean a code base for the translation
unit, I don't think it would be a problem today. C++ already
allows it in some special cases: within a class, or when
defining an inline function.

It is the sort of feature that works well in small single file programs
but C++ is designed for use across the entire range of program sizes and
separate compilation is an inherent design feature of the language.

And I thought such a feature would actually make it easier to organize
big code-bases. For example, it would save us the horrendeous cases of
ill-formed programs with *no diagnostics required* such as 14.3.3/2.
Instead of the programmer has to do the book-keeping of getting
forward declarations in place, the compiler just has to collect a
database of the single definitions for everything (all partial
specializations in this case) and take them all into consideration (so
no such ill-form cases exist).

Please explain why that isn't just better (as I think it seems to be).

Please explain what isn't just better:-). Seriously, there are
arguments for maintaining the code in a data base, and at least
one compiler does so (or did---I don't know what the current
status is). But it can be tricky, and you have to define the
semantics carefully; you end up having to specify not just a
language, but a build system as well.

James Kanze

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