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c++ Programming Glossary: lessIs there a difference in C++ between copy initialization and direct initialization? http://stackoverflow.com/questions/1051379/is-there-a-difference-in-c-between-copy-initialization-and-direct-initializati is an exact match B A const There is no conversion much less a user defined conversion needed to call that constructor note.. both accepting a reference to the same type then the less const version wins this is by the way also the mechanism that..
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 System.out.println sum sum with a similar but less extreme result. My first thought was that sorting brings the.. try to identify a pattern and follow it. This is more or less how branch predictors work. Most applications have well behaved.. recognizable patterns branch predictors are virtually useless. Further Reading Branch_predictor . As hinted from above the..
throwing exceptions out of a destructor http://stackoverflow.com/questions/130117/throwing-exceptions-out-of-a-destructor to say otherwise that throwing destructors are more or less okay. So my question is this if throwing from a destructor results..
Most effective way for float and double comparison http://stackoverflow.com/questions/17333/most-effective-way-for-float-and-double-comparison the compare function but only if the expected values are less than 1. Also if you basically have int arithmetic in doubles..
What uses are there for “placement new”? http://stackoverflow.com/questions/222557/what-uses-are-there-for-placement-new and constructing an object on a pre allocated buffer takes less time char buf new char sizeof string pre allocated buffer string..
Undefined, unspecified and implementation-defined behavior http://stackoverflow.com/questions/2397984/undefined-unspecified-and-implementation-defined-behavior of the C standard also mentions undefined behavior's two less dangerous brothers unspecified behavior and implementation defined..
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 const_cast also works similarly on volatile though that's less common. dynamic_cast is almost exclusively used for handling.. should be preferred when explicit casting is needed unless you are sure static_cast will succeed or reinterpret_cast will..
http://stackoverflow.com/questions/402283/stdwstring-vs-stdstring if you work on Windows you badly want to use wchar_t unless you use a framework hiding that like GTK or QT ... . The fact.. if only that a UTF 8 text and UTF 16 text will always use less or the same amount of memory than an UTF 32 text and usually.. the same amount of memory than an UTF 32 text and usually less . If there is a memory issue then you should know than for most..
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 are not value initialized but have indeterminate values unless of course Array4 is a global array int array 2 1 2 3 4 ERROR.. layout of the object. So if you want to write a more or less portable dynamic library that can be used from C and even .NET..
http://stackoverflow.com/questions/4421706/operator-overloading that the postfix variant does more work and is therefore less efficient to use than the prefix variant. This is a good reason.. better to make a habit of always using prefix increment unless postfix is explicitly needed. Binary arithmetic operators For.. reasonable use cases for overloading these. 3 Again the lesson to be taken from this is that a b is in general more efficient..
http://stackoverflow.com/questions/4810664/how-do-i-use-arrays-in-c C provides abstractions that are easier to use and less error prone std vector T since C 98 and std array T n since.. kick in because adding an array and an integer is meaningless there is no plus operation on arrays but adding a pointer and.. from an array to a pointer. Since this is meaningless but pointer to pointer assignment makes sense array to pointer..
http://stackoverflow.com/questions/485525/round-for-float-in-c common way but there are others as round to even which is less biased and generally better if you're going to do a lot of rounding...
How to convert a number to string and vice versa in C++ http://stackoverflow.com/questions/5290089/how-to-convert-a-number-to-string-and-vice-versa-in-c basically this option is the same as the previous one just less verbose. #include boost lexical_cast.hpp #include string int..
http://stackoverflow.com/questions/589575/size-of-int-long-etc all but the most obscure platforms it's 8 and it can't be less than 8 . One additional constraint for char is that its size..
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 on a template parameter is assumed not to name a type unless the applicable name lookup finds a type name or the name is.. template argument list and never as a name followed by the less than operator Now we are back to the same problem as with typename..
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 If you want a hardcopy of the C90 standard for much less money than above you may be able to find a cheap used copy of..
Passing an operator along with other parameters http://stackoverflow.com/questions/1190062/passing-an-operator-along-with-other-parameters T lhs T rhs return lhs.CompareTo rhs 0 static Func T bool Less T where T IComparable T return delegate T lhs T rhs return.. arg1 arg2 perform rest of work void main DoWork Functor.Less int 100 200 DoWork Functor.Greater int 100 200 EDIT I corrected..
prefix/suffix increment [duplicate] http://stackoverflow.com/questions/12862733/prefix-suffix-increment the variable first and i increments afterward. 2 Less obviously complex expressions mixing infix increment decrement..
Divide and Conquer array algorithm ++ http://stackoverflow.com/questions/13284503/divide-and-conquer-array-algorithm int SimpleSort int length int A 25 5 20 10 50 int i 25 Less Than int u 2 Greater Than for int Count 0 Count length Count.. code int A 5 10 25 30 50 100 200 500 1000 2000 int i 10 Less Than int u 5 Greater Than int min 1 int max length int mid min..
What are the differences between concepts and template constraints? http://stackoverflow.com/questions/15669592/what-are-the-differences-between-concepts-and-template-constraints they are equivalent. Greater Whenever x y then y x . Less_equal Whenever x y then y x . Copy_equality For x and y of type.. concept concept Ordered Regular T requires constraint Less T requires axiom Strict_total_order less T T requires axiom.. less T T requires axiom Greater T requires axiom Less_equal T requires axiom Greater_equal T First note that for the..
c++ vector size. why -1 is greater than zero http://stackoverflow.com/questions/16250058/c-vector-size-why-1-is-greater-than-zero vector size a.size std endl int b 1 if b a.size std cout Less else std cout Greater return 0 I'm confused by the fact that..
Use a regular iterator to iterate backwards, or struggle with reverse_iterator? http://stackoverflow.com/questions/1853358/use-a-regular-iterator-to-iterate-backwards-or-struggle-with-reverse-iterator reverse for loops Don't have to remember or explain the 1 Less typing Works for std list too it il.erase it If you erase an..
problem sorting using member function as comparator http://stackoverflow.com/questions/1902311/problem-sorting-using-member-function-as-comparator wrap the functor inside the class class MyClass struct Less Less const MyClass c myClass c bool operator const int i1 const.. the functor inside the class class MyClass struct Less Less const MyClass c myClass c bool operator const int i1 const int..
Is there a sorted_vector class, which supports insert() etc.? http://stackoverflow.com/questions/2710221/is-there-a-sorted-vector-class-which-supports-insert-etc Much faster iteration than standard associative containers Less memory consumption for small objects and for big objects if..
Why is the linux kernel not implemented in C++? [closed] http://stackoverflow.com/questions/520068/why-is-the-linux-kernel-not-implemented-in-c are some reasons that a kernel in C might be a good idea Less boiler plate code to use the common dynamic dispatch pattern...
Why doesn't C++ support dynamic arrays on the stack? [closed] http://stackoverflow.com/questions/7458857/why-doesnt-c-support-dynamic-arrays-on-the-stack sizes that need to be on the stack temporary buffers . Less smart pointers or worse manual bug introducing delete 's and..
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