[Bug libstdc++/13121] Wanted: check in valarray::operator= for length of array

[gdr at integrable-solutions dot net]

------- Additional Comments From gdr at integrable-solutions dot net  2003-11-20 03:22 -------
Subject: Re:  Inserting struct with valarray in map fails

"bangerth at dealii dot org" <gcc-bugzilla@gcc.gnu.org> writes:

| The reason why the standard says this is undefined behavior is that
| the creators of valarray wanted to have maximum speed for this class.

Valarray was designed to be a low level building block for superscalar
computers.  In particular, jumps are "conceptually" minimized.

| A check for the length and possibly throwing an exception might sacrifice
| this goal, although it would of course be much cheaper than the actual
| memory allocation this "feature" is to prevent. I leave this up to
| the libstdc++ maintainers -- maybe their new debug mode lib has this
| fixed already.

I have no plan to go there.

-- Gaby


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13121