Re: The bug where terminal and xcode ran "different"
Re: The bug where terminal and xcode ran "different"
- Subject: Re: The bug where terminal and xcode ran "different"
- From: Marshall Clow <email@hidden>
- Date: Sun, 11 Feb 2007 10:45:28 -0800
At 5:41 PM +0000 2/11/07, Theodore H. Smith wrote:
For the most part I'll be using stl classes. But what about for when
you want to write the highest performance stuff? For example, can I
assume that a vector stores it's data linearly in RAM? if so, I
could use the vector to allocate the memory, and then just access it
with a pointer. The best of both I'd say! Either that or make a
class which does exactly the same thing.
Yes. One of the design criteria for vector is that it is able to
interoperate with C code that expects arrays. "&*v.begin ()" (or
alternately, "&v[0]") will give you a pointer to the first element in
the vector. If your vector-unaware code writes past the end of the
vector, you will get undefined behavior, but that's pretty much the
same as with an array, isn't it. (Note: it's easy to mistake
"capacity" and "size" in a vector).
One problem I have with stl, is that it's not really "lowest common
denominator". The nice thing about simple libraries is that they
tend to be available everywhere.
Now that I think about it, I think that idea might be a bit silly.
Maybe an idea to use STL even within high performance code? I
suppose STL should be available everywhere Iw ant to go these days
right?
The STL is not available everywhere - lots of people (especially
doing embedded work) are still using frighteningly old tool chains -
gcc 2.9.5 or ADS 1.2 are considered "up to date", and those compilers
generally have trouble with non-trivial templates.
However, C++ (including the STL) was adopted as an ANSI standard many
years ago (1998, if I recall correctly); so compiler vendors have had
quite a bit of time to update their products, and my opinion is that
any compiler that doesn't support STL today counts as "no longer
being developed".
--
-- Marshall
Marshall Clow Idio Software <mailto:email@hidden>
It is by caffeine alone I set my mind in motion.
It is by the beans of Java that thoughts acquire speed,
the hands acquire shaking, the shaking becomes a warning.
It is by caffeine alone I set my mind in motion.
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