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c++ Programming Glossary: takeWhy 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 Trains are heavy and have a lot of inertia. So they take forever to start up and slow down. Is there a better way You.. are complicated and have long pipelines. So they take forever to warm up and slow down . Is there a better way You.. after it switches direction. Quick visualization T branch taken N branch not taken data 0 1 2 3 4 ... 126 127 128 129 130 .....
Why is “using namespace std;” considered bad practice? http://stackoverflow.com/questions/1452721/why-is-using-namespace-std-considered-bad-practice import Quux into your global namespace. This is going to take some effort to fix especially if the function parameters happen..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom functionality to create a local copy of the data then takes the copied data with a swap function swapping the old data.. first notice an important choice the parameter argument is taken by value . While one could just as easily do the following.. going on here Recall the goal of move construction to take the resources from another instance of the class leaving it..
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 if the original variable is const if you use it to take the const off a reference to something that wasn't declared..
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 If you clean out any one of them the remaining ones will take a larger percentage and be easier to spot on subsequent passes... these costs are equally likely a priori. Then suppose we take just 2 stack samples and we see instruction I on both samples.. on average proportional to their cost. If n samples are taken and f is the cost then I will appear on nf sqrt nf 1 f samples...
http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three yields undefined behavior . Since the assignment does not take into account what name pointed to before the assignment sooner.. name name local_name age that.age return this This also takes care of self assignment without an explicit check. An even..
Undefined Behavior and Sequence Points http://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points and no side effects of subsequent evaluations shall have taken place. §1.9 7 Side effects What are side effects Evaluation.. the evaluation of all function arguments if any which takes place before execution of any expressions or statements in.. individual expressions and the order in which side effects take place is unspecified . For example int x 5 y 6 int z x y it..
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 to know about both aggregates and POD's Plain Old Data take time and read it. If you are interested just in aggregates read.. .NET you should try to make all your exported functions take and return only parameters of POD types. The lifetime of objects..
http://stackoverflow.com/questions/4421706/operator-overloading member functions. Other than this it can be overloaded to take any number of additional arguments including zero. Throughout.. flavor. To tell one from the other the postfix variants take an additional dummy int argument. If you overload increment.. has to return a new value. 3 Also note that operator takes its left operand by copy rather than by const reference. The..
How do I tokenize a string in C++? http://stackoverflow.com/questions/53849/how-do-i-tokenize-a-string-in-c easily be built using the std string find method. However take a look at Boost.Tokenizer . It's great. Boost generally has..
What are the differences between pointer variable and reference variable in C++? http://stackoverflow.com/questions/57483/what-are-the-differences-between-pointer-variable-and-reference-variable-in-c to NULL while reference can never point to NULL You can't take the address of a reference like you can with pointers There's.. with pointers There's no reference arithmetics but you can take the address of an object pointed by a reference and do pointer.. same memory address with the original variable but also takes up some space on the stack. Since a reference has the same..
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 expressions a subset of them represent names. A name can take different forms the draft Standard says A name is a use of an.. typename t x f . If you omit the keyword and the name is taken to be a non type but when instantiation finds it denotes a.. often get parser errors already at definition time t x is taken as non type but as an expression the following misses an operator..
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 and unnecessary. Instead implementations let you make mistakes and get away with it. Most of the time. Until one day something.. your power. In normal C# there simply is no way to take the address of a local and return it or store it for later... of a local and return it or store it for later. You can take the address of a local but the language is cleverly designed..
OpenCV C++/Obj-C: Advanced square detection http://stackoverflow.com/questions/10533233/opencv-c-obj-c-advanced-square-detection further and find squares which edge aren't fully visible. Take a look at this example Any ideas I'm working with karlphillips..
http://stackoverflow.com/questions/1095298/gcc-c-linker-errors-undefined-reference-to-vtable-for-xxx-undefined-refere objects you will have missing dependencies. How it works Take all the object files and combine them into an executable Resolve..
Why is it wrong to use std::auto_ptr<> with standard containers? http://stackoverflow.com/questions/111478/why-is-it-wrong-to-use-stdauto-ptr-with-standard-containers std auto_ptr does not fulfill this requirement. Take for example this code class X std vector std auto_ptr X vecX..
Any reason to overload global new and delete? http://stackoverflow.com/questions/1152511/any-reason-to-overload-global-new-and-delete the general speedup you can get from the global overloads. Take a look at some of the allocators and debugging systems that..
Why use iterators instead of array indices? http://stackoverflow.com/questions/131241/why-use-iterators-instead-of-array-indices use iterators instead of array indices Take the following two lines of code for int i 0 i some_vector.size..
Swapping two variable value without using 3rd variable http://stackoverflow.com/questions/1826159/swapping-two-variable-value-without-using-3rd-variable should output the optimum machine code for your platform. Take for example this quick test program written in C. #include stdlib.h..
SFINAE to check for inherited member functions http://stackoverflow.com/questions/1966362/sfinae-to-check-for-inherited-member-functions metaprogramming sfinae share improve this question Take a look at this thread http lists.boost.org boost users 2009..
How do you reverse a string in place in C or C++? http://stackoverflow.com/questions/198199/how-do-you-reverse-a-string-in-place-in-c-or-c n argv argc 1 while argc return 0 This is XOR swap thing. Take care to note that you must avoid swapping with self because..
What techniques can be used to speed up C++ compilation times? http://stackoverflow.com/questions/373142/what-techniques-can-be-used-to-speed-up-c-compilation-times improve this question Language techniques Pimpl Idiom Take a look at the pimpl idiom here and here . Also known as an Opaque..
How are C array members handled in copy control functions? http://stackoverflow.com/questions/4164279/how-are-c-array-members-handled-in-copy-control-functions This is something I have wondered for a long time. Take the following example struct matrix float data 16 I know what..
How do I get started in embedded programming? [closed] http://stackoverflow.com/questions/45247/how-do-i-get-started-in-embedded-programming your project online maybe get it featured on Hack a Day Take a class in embedded systems or real time operating systems Update..
What does T&& (double ampersand) mean in C++11? http://stackoverflow.com/questions/5481539/what-does-t-double-ampersand-mean-in-c11 to properly forward arguments for templated functions. Take for example this factory function template typename T typename..
Difference between try-catch syntax for function http://stackoverflow.com/questions/6756931/difference-between-try-catch-syntax-for-function Throwing a exception from destructors is an bad idea Take a look here to know why. Guideline 2 Destructor function try..
Exotic architectures the standards committees care about http://stackoverflow.com/questions/6971886/exotic-architectures-the-standards-committees-care-about c c architecture share improve this question Take a look at this one Unisys ClearPath Dorado Servers offering..
Memory management in C++ [closed] http://stackoverflow.com/questions/76796/memory-management-in-c manually try to use smart pointers where applicable. Take a look at the Boost lib TR1 and smart pointers . Also smart..
Square detection doesn't find squares http://stackoverflow.com/questions/7731742/square-detection-doesnt-find-squares catch squares with gradient shading if l 0 apply Canny. Take the upper threshold from slider and set the lower to 0 which..
How do I pass a unique_ptr argument to a constructor or a function? http://stackoverflow.com/questions/8114276/how-do-i-pass-a-unique-ptr-argument-to-a-constructor-or-a-function But movement doesn't actually happen because of std move . Take the following statement std unique_ptr Base newPtr std move..
What is “rvalue reference for *this”? http://stackoverflow.com/questions/8610571/what-is-rvalue-reference-for-this is called on is an rvalue unnamed temporary for example . Take the following code as a further example struct test2 std unique_ptr..
View array in Visual Studio debugger? [duplicate] http://stackoverflow.com/questions/972511/view-array-in-visual-studio-debugger this question You can try this nice little trick for C . Take the expression which gives you the array and then append a comma..
http://stackoverflow.com/questions/988158/take-the-address-of-a-one-past-the-end-array-element-via-subscript-legal-by-the the address of a one past the end array element via subscript..
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