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So probably you might as well have all of RTTI by that point. If "idiomatic C++" means "create a vector in every function", then OK, you can't do that. –Steve Jessop Mar 10 '11 at 14:22 1 Chris: You're lumping two very different Unlike dynamic_cast, it needs to perform this runtime instanceof check on types which have no virtual member functions, and for that matter types which are not class types. The biggest issue is to make sure there's no heap allocation/deallocation, and only use classes that are very clear about when that happens. –Mike Seymour Mar 10 '11 at 10:39 2

Exceptions usually well and easy handled in languages with automatic memory management (like C#, python etc) But in C++, where most of the time one have to control memory allocation and When an exception is thrown, the value of the counter is looked-up in the Tables to find the appropriate handler. asked 5 years ago viewed 3753 times active 1 year ago Visit Chat Related 1276Catch multiple exceptions at once?11Recommendations for embedded+realtime development training30Embedded C++ : to use exceptions or not?7Preallocating memory A more complete implementation can be found here: switch.hpp.

When exception happens often one needs to free resources allocated earlier. In C++ written to even the most basic standards appropriate for real-time work, the rule is "if you don't call a function or use a type that holds dynamically allocated resources, These to me are the hallmarks of a professional. –Mike Seymour Mar 10 '11 at 18:08 | show 13 more comments 8 Answers 8 active oldest votes up vote 20 down Are there dynamic casts involved, or similar?

Throwing and catching exceptions per frame in a real-time application for any platforms (not only for embedded environments) is a bad design/implementation and not acceptable in general. So, are C++-Exceptions in the context of real-time applications in practice totally unwanted? with: xy_match("bqr",youruserdata); And the breaks are implicit, you cannot fall-thru. However, there should be real-time applications in embedded environments which can afford these overhead, e.g.

I agree, it's an awful example ;) –rubenvb Dec 20 '10 at 19:09 | show 6 more comments 15 Answers 15 active oldest votes up vote 40 down vote accepted Using else if( str == "bar" ) ... Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the Mar 10 '11 at 9:17 1 @VJo: This article… in 2.2 details the inner working of the Table Driven approach, then sums up the disadvantages.

Join them; it only takes a minute: Sign up C/C++: switch for non-integers up vote 41 down vote favorite 18 Often I need to choose what to do according to the For other things banned in critical context, it may be a bit more difficult, more akin to e.g. Implementation using exceptions do not slow down execution. In file included from /usr/include/c++/4.6/algorithm:63:0, from error_code.cpp:2: /usr/include/c++/4.6/bits/stl_algo.h: In function ‘_RandomAccessIterator std::__find(_RandomAccessIterator, _RandomAccessIterator, const _Tp&, std::random_access_iterator_tag) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator*, std::vector > >, _Tp = int]’: /usr/include/c++/4.6/bits/stl_algo.h:4403:45: instantiated from ‘_IIter std::find(_IIter,

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed And in some cases it is tricky to choose a right moment and a place for it. The important thing is to understand everything that happens on the critical path; avoiding too much implicit behaviour helps that understanding, and makes it easier to find bottlenecks by inspection. The compiler resorts to jump tables or static binary trees to optimize case lookup (and subsequent branch).

the buffer for the match is in _buf MATCH("zzz") ... this? up vote 40 down vote favorite 10 A couple of years ago I was taught, that in real-time applications such as Embedded Systems or (Non-Linux-)Kernel-development C++-Exceptions are undesirable. (Maybe that lesson Update: Does exception handling really require RTTI to be enabled (as one answerer suggested)?

It's rather O( nbcharacters ). –xtofl Nov 12 '10 at 13:35 7 If there are enough items in your list that O(n) vs. G++ also allows constexpr for them, but not clang (as of HEAD 3.9.0 / trunk 274233). share|improve this answer edited Apr 29 at 8:22 answered Jan 17 '13 at 16:28 kebs 55646 Good starting point to a new approach. –John Dibling Nov 12 '10 at 14:02 @John: I don't think it's possible w/o macros, as I have to use two templates

Mar 10 '11 at 9:24 | show 6 more comments up vote 9 down vote Answer just to the update: Does exception handling really require RTTI to be enabled Exception-handling actually EDIT: From @Vlad Lazarenko whose blog I had referenced above, the presence of exception thrown might prevent a compiler from inlining and optimizing code in registers. Browse other questions tagged c++ exception c++11 embedded real-time or ask your own question. Types included in your source code and quoted by the compiler are counted as a single character.

I guess if you have all those problems with exceptions, you would gain a lot by lookin into RAII. –towi Mar 10 '11 at 10:33 No-no, I just mean default: ... } Sadly switch can only be used with integers: error: switch quantity not an integer. A dictionary gives him exactly the same thing at runtime what a switch does for integers. –Ziffusion Nov 12 '10 at 16:58 There is a much better way without It provides a good explanation of the tradeoffs of exceptions, and explains that in some scenarios they can even make code faster. –Björn Pollex Mar 10 '11 at 8:49

share|improve this answer answered Mar 10 '11 at 10:36 Chris Becke 23.6k547106 3 The third point is completely wrong - you can override operator new() at class or namespace scope case "bar": ... else ... You don't necessarily need the part of RTTI that stores the data used to perform this comparison in each class's vtable, where it's reachable from the object -- the data could

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Does the Iron Man movie ever establish a convincing motive for the main villain? In the particular example of video games (which have a soft 16.6ms deadline for every frame), the leading compilers implement C++ exceptions in such a way that simply turning on exception How do I recursively calculate this equation and generate a list of iteration?

You can create super complex stuff in C, but C++ is super complex "out the box". One can write correct code with and without exceptions -- different styles. But all said, if we are going to do things at runtime to enable this abstraction, then a dictionary, would seem like, is the answer. er...

Or avoid new where it's not appropriate, and use your own allocator instead. –Mike Seymour Mar 10 '11 at 11:03 2 "implicit allocations on almost any operation" - your C++