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c++ Programming Glossary: evenWhat is a smart pointer and when should I use one? http://stackoverflow.com/questions/106508/what-is-a-smart-pointer-and-when-should-i-use-one the smart pointer class uses. Destruction would happen even if DoSomething raises an exception The simplest policy in use.. Note that scoped_ptr instances cannot be copied. This prevents the pointer from being deleted multiple times incorrectly..
Why is processing a sorted array faster than an unsorted array? http://stackoverflow.com/questions/11227809/why-is-processing-a-sorted-array-faster-than-an-unsorted-array statement if data c 128 sum data c Notice that the data is evenly distributed between 0 and 255. When the data is sorted roughly.. is unable to generate conditional moves for this branch even under Ox . Intel Compiler 11 does something miraculous. It interchanges.. branch with the loop interchange . This goes to show that even mature modern compilers can vary wildly in their ability to..
How to pass objects to functions in C++? http://stackoverflow.com/questions/2139224/how-to-pass-objects-to-functions-in-c make passing and returning by value much more attractive even for complex objects. Rules of thumb for C 03 Pass arguments..
Undefined, unspecified and implementation-defined behavior http://stackoverflow.com/questions/2397984/undefined-unspecified-and-implementation-defined-behavior write C programs that do not behave in a predictable way even though many C compilers will not report any errors in the program.. anything to happen once you invoke undefined behavior even nasal demons . It does not matter what the correct behavior..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom test. This check serves two purposes it's an easy way to prevent us from running needless code on self assignment and it protects.. gives us a strong exception guarantee for free we won't even enter the function if construction of the copy fails and it's..
When should static_cast, dynamic_cast and reinterpret_cast be used? http://stackoverflow.com/questions/332030/when-should-static-cast-dynamic-cast-and-reinterpret-cast-be-used a variable no other C cast is capable of removing it not even reinterpret_cast . It is important to note that modifying a.. more than just casting downwards you can cast sideways or even up another chain. The dynamic_cast will seek out the desired..
What can I use to profile C++ code in Linux? http://stackoverflow.com/questions/375913/what-can-i-use-to-profile-c-code-in-linux see it once that doesn't tell us much except that f 0. So even a very small number of samples can tell us a lot about the cost..
http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three operator When do I need to declare them myself How can I prevent my objects from being copied c copy constructor assignment.. must tear down the old state before assigning to name to prevent memory leaks. Also we have to protect against self assignment.. care of self assignment without an explicit check. An even more robust solution to this problem is the copy and swap idiom..
What are Aggregates and PODs and how/why are they special? http://stackoverflow.com/questions/4178175/what-are-aggregates-and-pods-and-how-why-are-they-special is essential for defining POD's. If you find any errors even minor including grammar stylistics formatting syntax etc. please.. operator and or destructor An array is an aggregate even it is an array of non aggregate class type. Now let's look at.. braces. I think that if you are advanced enough in C to even consider using unions their use may be very dangerous and must..
http://stackoverflow.com/questions/4421706/operator-overloading It's rarely used and thus rarely ever overloaded. In fact even iterators do not overload it. Continue to Conversion Operators..
Why is iostream::eof inside a loop condition considered wrong? http://stackoverflow.com/questions/5605125/why-is-iostreameof-inside-a-loop-condition-considered-wrong operator would be converted to false and the loop wouldn't even be entered do stuff with correctly initialized data hopefully..
Where and why do I have to put the “template” and “typename” keywords? http://stackoverflow.com/questions/610245/where-and-why-do-i-have-to-put-the-template-and-typename-keywords a discriminated union capable of holding C types even if they have destructors etc. I implemented this as a Russian..
Can a local variable's memory be accessed outside its scope? http://stackoverflow.com/questions/6441218/can-a-local-variables-memory-be-accessed-outside-its-scope to be in the room. Nor is there a mysterious force that prevents you from entering a room with a stolen key. The hotel management.. to be in and rummaging through a desk that might not even be there anymore C is not going to stop you. Safer languages..
Where do I find the current C or C++ standard documents? http://stackoverflow.com/questions/81656/where-do-i-find-the-current-c-or-c-standard-documents or Google for download locations . However in my opinion even though the draft versions might be very close to the final ratified..
Most efficient way to erase duplicates and sort a c++ vector? http://stackoverflow.com/questions/1041620/most-efficient-way-to-erase-duplicates-and-sort-a-c-vector Pate and Todd Gardner a std set might be a good idea here. Even if you're stuck using vectors if you have enough duplicates..
What's “wrong” with C++ wchar_t and wstrings? What are some alternatives to wide characters? http://stackoverflow.com/questions/11107608/whats-wrong-with-c-wchar-t-and-wstrings-what-are-some-alternatives-to-wide for simple text algorithms as variable width encodings. Even if one strictly maintains a composed normalization some characters..
Why is processing a sorted array faster than an unsorted array? http://stackoverflow.com/questions/11227809/why-is-processing-a-sorted-array-faster-than-an-unsorted-array branch consecutively goes the same direction many times. Even a simple saturating counter will correctly predict the branch..
Examples of when a bitwise swap() is a bad idea? http://stackoverflow.com/questions/11638271/examples-of-when-a-bitwise-swap-is-a-bad-idea and clear implementation of swap has performance problems. Even in that case I would only go with this sort of approach for..
Why should I not try to use “this” value after “delete this”? http://stackoverflow.com/questions/1866461/why-should-i-not-try-to-use-this-value-after-delete-this trying to load an invalid memory address into a register. Even though it may be fine on all modern hardware the standard says..
How to parse a string to an int in C++? http://stackoverflow.com/questions/194465/how-to-parse-a-string-to-an-int-in-c myString It will throw an exception on conversion error. Even these new functions still have the same issue as noted by Dan..
Static variables initialisation order http://stackoverflow.com/questions/211237/static-variables-initialisation-order about but how the linker is invoked by your build system. Even try to solve the problem is practically a non starter. This..
How do exceptions work (behind the scenes) in c++ http://stackoverflow.com/questions/307610/how-do-exceptions-work-behind-the-scenes-in-c Ubuntu 4.1.2 0ubuntu4 .section .note.GNU stack @progbits Even more exception handling tables and assorted extra information...
Why does C++ compilation take so long? http://stackoverflow.com/questions/318398/why-does-c-compilation-take-so-long to interpret and this can become ridiculously complicated. Even relatively simple template metaprogramming code can define recursive..
When should static_cast, dynamic_cast and reinterpret_cast be used? http://stackoverflow.com/questions/332030/when-should-static-cast-dynamic-cast-and-reinterpret-cast-be-used static_cast will succeed or reinterpret_cast will fail. Even then consider the longer more explicit option. C style casts..
Is a string literal in c++ created in static memory? http://stackoverflow.com/questions/349025/is-a-string-literal-in-c-created-in-static-memory the TEXT code segment and DATA initialised data segment. Even when you have code like char x hello the hello string itself..
Why does C++ not have reflection? http://stackoverflow.com/questions/359237/why-does-c-not-have-reflection C# then that class will exist in the resulting assembly. Even if I never use it. Even if all calls to its member functions.. exist in the resulting assembly. Even if I never use it. Even if all calls to its member functions could be inlined. The class..
http://stackoverflow.com/questions/408670/stack-static-and-heap-in-c learn proper memory management pick something with a GC. Even if you know how to manage memory well it will save you time..
http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three release this resource via delete ~person delete name Even today people still write classes in this style and get into..
Operator Precedence vs Order of Evaluation http://stackoverflow.com/questions/5473107/operator-precedence-vs-order-of-evaluation doesn't necessarily affect order of evaluation either. Even though a is the target of the assignment this still evaluates..
How to determine CPU and memory consumption from inside a process? http://stackoverflow.com/questions/63166/how-to-determine-cpu-and-memory-consumption-from-inside-a-process by my process The code had to run on Windows and Linux. Even though this seems to be a standard task finding the necessary..
Why should `new` be used as little as possible? http://stackoverflow.com/questions/6500313/why-should-new-be-used-as-little-as-possible the heap's flexibility. Reasons to use dynamic allocation Even if using the heap is slower and potentially leads to memory..
How should I write ISO C++ Standard conformant custom new and delete operators? http://stackoverflow.com/questions/7194127/how-should-i-write-iso-c-standard-conformant-custom-new-and-delete-operators by a call to a corresponding deallocation function . Even if the size of the space requested is zero the request can fail...
C/C++: Array size at run time w/o dynamic allocation is allowed? http://stackoverflow.com/questions/737240/c-c-array-size-at-run-time-w-o-dynamic-allocation-is-allowed codes to mine are claimed to give storage size error. Even Deitel's C How To Program p. 261 states under Common Programming..
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