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c++ Programming Glossary: it'sWhy 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 back and restarting. This is branch prediction. I admit it's not the best analogy since the train could just signal the direction.. equivalent to the original if statement. But in this case it's valid for all the input values of data . Benchmarks Core i7..
Undefined, unspecified and implementation-defined behavior http://stackoverflow.com/questions/2397984/undefined-unspecified-and-implementation-defined-behavior your mental model of the language. If the C standard says it's undefined behavior then it's undefined behavior period. Other.. If the C standard says it's undefined behavior then it's undefined behavior period. Other examples of undefined behavior..
Is it possible to write a C++ template to check for a function's existence? http://stackoverflow.com/questions/257288/is-it-possible-to-write-a-c-template-to-check-for-a-functions-existence just tested it with Linux and gcc 4.1 4.3. I don't know if it's portable to other platforms running different compilers. share..
http://stackoverflow.com/questions/3106110/what-is-move-semantics the copy and swap idiom learn it and come back because it's an awesome C idiom related to exception safety. string operator..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom it solve Does the idiom change when C 11 is used Although it's been mentioned in many places we didn't have any singular what.. the self assignment test. This check serves two purposes it's an easy way to prevent us from running needless code on self.. enter the function if construction of the copy fails and it's therefore not possible to alter the state of this . What we..
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 cases explicitly stating static_cast isn't necessary but it's important to note that the T something syntax is equivalent..
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 manually interrupt your program under the debugger while it's being subjectively slow there's a simple way to find performance.. of the coin The respected way to answer is to say that it's a Beta distribution with average value number of hits 1 number..
When to use forward declaration? http://stackoverflow.com/questions/553682/when-to-use-forward-declaration nothing about its size members or methods. This is why it's called an incomplete type . Therefore you cannot use the type..
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 used directly. A pointer to a class struct uses to access it's members whereas a reference uses a . . A pointer is a variable..
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 yield different parse trees depending on what t means. If it's a type then it will be parsed as a declaration and semantically.. it will declare f as a pointer variable . However if it's a non type it will be parsed as an expression. So the draft.. error messages are emitted by the compiler. Since whether it's a type or not determines parsing you will often get parser errors..
Do the parentheses after the type name make a difference with new? http://stackoverflow.com/questions/620137/do-the-parentheses-after-the-type-name-make-a-difference-with-new the type you're newing up is a POD plain old data or if it's a class that contains POD members and is using a compiler generated.. A value initialize A which is zero initialization since it's a POD. new B default initializes leaves B m uninitialized new..
What is the difference between a definition and a declaration? http://stackoverflow.com/questions/1410563/what-is-the-difference-between-a-definition-and-a-declaration actually instantiates implements this identifier. It's what the linker needs in order to link references to those entities...
http://stackoverflow.com/questions/1461432/what-is-array-decaying c c arrays pointers share improve this question It's said that arrays decay into pointers. A C array declared as..
What is this weird colon-member syntax in the constructor? http://stackoverflow.com/questions/1711990/what-is-this-weird-colon-member-syntax-in-the-constructor c faq ctor initializer share improve this question It's a member initialization list . You should find information about..
Variable length arrays in C++? http://stackoverflow.com/questions/1887097/variable-length-arrays-in-c some very heavyweight names on both sides of the argument. It's certainly not obvious that a std vector is always a better solution...
Best way to detect integer overflow in C/C++ http://stackoverflow.com/questions/199333/best-way-to-detect-integer-overflow-in-c-c uint32_t a size_t bits 0 while a 0 bits a 1 return bits It's not perfect but that'll give you a good idea whether any two..
What should main() return in C and C++? http://stackoverflow.com/questions/204476/what-should-main-return-in-c-and-c argv which is equivalent to int main int argc char argv It's also worth noting that in C int main can be left without a return..
What are the rules about using an underscore in a C++ identifier? http://stackoverflow.com/questions/228783/what-are-the-rules-about-using-an-underscore-in-a-c-identifier are the rules about using an underscore in a C identifier It's common in C to name member variables with some kind of prefix..
http://stackoverflow.com/questions/236129/how-to-split-a-string-in-c input string relying only on standard library facilities. It's an example of the power and elegance behind the design of the..
When does invoking a member function on a null instance result in undefined behavior? http://stackoverflow.com/questions/2474018/when-does-invoking-a-member-function-on-a-null-instance-result-in-undefined-beha this question Both a and b result in undefined behavior. It's always undefined behavior to call a member function through..
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 number of conversions that reinterpret_cast cannot do too. It's used primarily for particularly weird conversions and bit manipulations..
Why have header files and .cpp files in C++? [closed] http://stackoverflow.com/questions/333889/why-have-header-files-and-cpp-files-in-c needed when something in the implementation changes. It's not perfect and you would usually resort to techniques like..
http://stackoverflow.com/questions/4421706/operator-overloading never be overloaded. For operator see this question . It's rarely used and thus rarely ever overloaded. In fact even iterators..
http://stackoverflow.com/questions/485525/round-for-float-in-c generally better if you're going to do a lot of rounding. It's a bit more complex to implement though. share improve this..
What's this STL vs. “C++ Standard Library” fight all about? [closed] http://stackoverflow.com/questions/5205491/whats-this-stl-vs-c-standard-library-fight-all-about long as all parties understand what is being talked about. It's a term made even more prevalent by the nature of the beast much.. in the C Standard Library which is plain incorrect. It's my belief that continuing to propagate the usage of the term..
How do I tokenize a string in C++? http://stackoverflow.com/questions/53849/how-do-i-tokenize-a-string-in-c find method. However take a look at Boost.Tokenizer . It's great. Boost generally has some very cool string tools. share..
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 base class you are not allowed to write typename . It's assumed that the name given is a class type name. This is true..
Difference between 'struct' and 'typedef struct' in C++? http://stackoverflow.com/questions/612328/difference-between-struct-and-typedef-struct-in-c this question In C there is only a subtle difference. It's a holdover from C in which it made a difference. In C there..
http://stackoverflow.com/questions/6438086/iterator-invalidation-rules values of objects within that container. 23.1 11 Note 2 It's not clear in C 2003 whether end iterators are subject to the..
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 pushed on it is going to be the last thing popped off. It's like the hotel decides to only rent out rooms sequentially and..
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