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Top Answer
Answered Nov 24, 2011 · 2 votes
I find it hard to imagine situations where the code samples you give would have different performance characteristics.
I do have a mild curiosity for you though. In Pascal like languages (e.g. Delphi) the loop limits are evaluated only once. This differs from the C like languages where the loop limits are evaluated each iteration. This can have performance implications but of course its trivial to write performant code in C like languages by introducing a local outside the loop.
For example:
Delphi
for i := 0 to List.Count-1 do DoStuff(List[i]);-
List.Count is only evaluated once.
C++
for (int i=0; i<List.getCount(); i++) DoStuff(List.getItem(i));-
Here, List.getCount() is called every time around the loop.
If it transpires that evaluating the loop limits is expensive then this difference can be relevant. Naturally it is trivial to evaluate List.getCount() outside the loop and store the result in a local variable.
Having compared the for loops of Pascal and C/C++ I would say that the Pascal version is very simplistic in comparison. This is not necessarily a bad thing because for more complex there is always while available.
Other Answers
Answered Nov 24, 2011 · 4 votes
All sensible compilers should compile equivalent loops to identical assembly / IL code involving branches and jumps. (at least with optimizations enabled)
Other Answers
Answered Nov 24, 2011 · 3 votes
On certain CPU architectures, the characteristics of the loop may provide opportunities for more optimization than the choice of for versus while.
In particular, FORTRAN and Pascal recommended a constant (rather than a variable) for the number of loop iterations which some CPUs can optimize. For example, on a Cyber (a 1970s Iron Dinosaur mainframe), a 15-bit register holds the for loop index which can easily be compared. A while instead uses one or two of the harder-to-access 60-bit registers. Also, a Cyber branch instruction is considerably more expensive than the loop housekeeping, or possibly the loop content. In such cases, a high level of optimization might unroll the loop to avoid all the overhead.
However, modern code generators don't work like they used to: source code is turned into an intermediate parse structure which abstracts such choices away. In short, for versus while makes no difference.
1/5
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2/5
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3/5
Top Answer
Answered Dec 04, 2009 · 12 votes
You could reverse your question : what toolkits are there, and which languauges do they support?
For Example GTK : (from wikipedia)
C GTK+ C++ gtkmm Ruby ruby-gtk2 Python PyGTK Java java-gnome .NET Gtk# PHP PHP-GTK Perl Gtk2-Perl
You can find support for many languages if you explore these other widget toolkits :
Juce — An extensive cross-platform UI toolkitFLTK — A light, cross platform, non-native widget toolkitFOX toolkit — A fast, open source, cross-platform widget toolkitGTK+ — The GIMP toolkit, a widget toolkit used by GNOME applicationsIUP_(software) -- IUP cross platform static/dynamic library C/LUA, Lua (MIT) licenceJX Application FrameworkMicrosoft Foundation Class - The most commonly used widgeting toolkit for Windows.MotifObject Windows Library & OWLNextQt — A widget toolkit used by KDEStandard Widget Toolkit — SWT for JavaSwing — Java widget toolkitTk — Toolkit part of the Tcl - project and often used by Perl and Python programmersUltimate++Visual Component LibrarywxWidgets — A free widget toolkitXForms
Other Answers
Answered Nov 24, 2011 · 4 votes
All sensible compilers should compile equivalent loops to identical assembly / IL code involving branches and jumps. (at least with optimizations enabled)
Other Answers
Answered Nov 24, 2011 · 3 votes
On certain CPU architectures, the characteristics of the loop may provide opportunities for more optimization than the choice of for versus while.
In particular, FORTRAN and Pascal recommended a constant (rather than a variable) for the number of loop iterations which some CPUs can optimize. For example, on a Cyber (a 1970s Iron Dinosaur mainframe), a 15-bit register holds the for loop index which can easily be compared. A while instead uses one or two of the harder-to-access 60-bit registers. Also, a Cyber branch instruction is considerably more expensive than the loop housekeeping, or possibly the loop content. In such cases, a high level of optimization might unroll the loop to avoid all the overhead.
However, modern code generators don't work like they used to: source code is turned into an intermediate parse structure which abstracts such choices away. In short, for versus while makes no difference.
4/5
Top Answer
Answered Jul 23, 2010 · 22 votes
Erlang, as described by Wikipedia:
It was designed by Ericsson to support distributed, fault-tolerant, soft-real-time, non-stop applications.
You might also want to read the Distributed Erlang section of their manual.
However, note that Erlang is a functional language and will require a much different paradigm of thought as compared to C++.
5/5
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