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c++ Programming Glossary: lookIs 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 Initializations Direct and Copy initialization While they look identical and are supposed to do the same these two forms are.. from it which is clearly the case here . So it will look for ways to do the conversion and will find the following candidates..
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 that the train must back up and go down the other path You look at the past history If the train goes left 99 of the time then..
Undefined, unspecified and implementation-defined behavior http://stackoverflow.com/questions/2397984/undefined-unspecified-and-implementation-defined-behavior compilers will not report any errors in the program Let's look at a classic example #include iostream int main char p hello..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom A failed solution Here's how a naive implementation might look the hard part dumb_array operator const dumb_array other if..
http://stackoverflow.com/questions/356950/c-functors-and-their-uses defines the operator . That lets you create objects which look like a function this is a functor struct add_x add_x int x x..
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 problems. Just halt it several times and each time look at the call stack. If there is some code that is wasting some.. it is big enough to be worth fixing. Yet another way to look at it is called the Rule Of Succession . If you flip a coin..
http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three The implicitly defined special member functions for person look like this 1. copy constructor person const person that name.. were in love with pointers. The person class might have looked like this class person char name int age public the constructor..
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 even it is an array of non aggregate class type. Now let's look at some examples class NotAggregate1 virtual void f remember.. very dangerous and must be thought of carefully you could look up the rules for unions in the standard yourself . Now that..
When to use virtual destructors? http://stackoverflow.com/questions/461203/when-to-use-virtual-destructors declare Base's destructor to be virtual. Now let's have a look at the following snippet Base b new Derived use b delete b Here's..
Why can templates only be implemented in the header file? http://stackoverflow.com/questions/495021/why-can-templates-only-be-implemented-in-the-header-file float If my explanation isn't clear enough you can have a look at the C FaqLite on this subject . share improve this answer..
How do I tokenize a string in C++? http://stackoverflow.com/questions/53849/how-do-i-tokenize-a-string-in-c be built using the std string find method. However take a look at Boost.Tokenizer . It's great. Boost generally has some very..
What are the barriers to understanding pointers and what can be done to overcome them? http://stackoverflow.com/questions/5727/what-are-the-barriers-to-understanding-pointers-and-what-can-be-done-to-overcome They are intended to give examples of what memory could look like after operations but they are more low level in nature... accurate enough. Let's assume the THouse class used below looks like this type THouse class private FName array 0..9 of Char.. the address from your piece of paper. When later on you look at the piece of paper you've forgotten that the house is no..
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 it. The process that determines this is called name lookup. This however presents a problem in templates How will you.. that say what namespace or class a name should be looked up in. A value dependent expression 1 N is not a name but.. is assumed not to name a type unless the applicable name lookup finds a type name or the name is qualified by the keyword..
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 check in sneak into your old room with your stolen key and look in the drawer. Your book is still there. Astonishing How can..
Representing 128-bit numbers in C++ http://stackoverflow.com/questions/1188939/representing-128-bit-numbers-in-c bit 512 bit etc... c math share improve this question Look into other libraries that have been developed. Lots of people..
http://stackoverflow.com/questions/1256246/address-of-register-variable of the CWG was in favor of deprecating register . Look what the C99 group WG14 said about register pdf at a meeting..
initializing a C++ std::istringstream from an in memory buffer? http://stackoverflow.com/questions/1448467/initializing-a-c-stdistringstream-from-an-in-memory-buffer correct way c streambuf share improve this question Look at std istrstream it has a constructor istrstream char pch int..
How can I call C++ functions from within ruby http://stackoverflow.com/questions/1542520/how-can-i-call-c-functions-from-within-ruby that will generate the Ruby wrapper around your C library. Look at SWIG for example http www.swig.org . You just have to create..
http://stackoverflow.com/questions/1610030/why-can-you-return-from-a-non-void-function-without-returning-a-value-without-pr This warning is enabled by Wall . Just as a curiosity. Look what this code does 1 #include iostream int foo int a 5 int..
C++: do you (really) write exception safe code? [closed] http://stackoverflow.com/questions/1853243/c-do-you-really-write-exception-safe-code Language Special Edition appendix E E.4.3.Swap . Looking at Visual C 2008 implementation of the vector's swap the.. safe http www.boost.org community exception_safety.html Look at the 7th point Automated testing for exception safety where..
Reading from text file until EOF repeats last line http://stackoverflow.com/questions/21647/reading-from-text-file-until-eof-repeats-last-line the chain of events. Grab 10 Grab 20 Grab 30 Grab EOF Look at the second to last iteration. You grabbed 30 then carried..
C/C++ function definitions without assembly http://stackoverflow.com/questions/2442966/c-c-function-definitions-without-assembly another frustrating level of indirection you ™d be right. Look in libc libio wgenops.c and you ™ll find the definition of __woverflow..
Returning the address of local or temporary variable [duplicate] http://stackoverflow.com/questions/2744264/returning-the-address-of-local-or-temporary-variable memory be accessed outside its scope 17 answers Look at the code below. I know it doesn't return the address of local..
virtual inheritance [duplicate] http://stackoverflow.com/questions/419943/virtual-inheritance to solve the DDD problem Dreadful Diamond on Derivation . Look at the following example where you have two classes that inherit..
How do I create a random alpha-numeric string in C++? http://stackoverflow.com/questions/440133/how-do-i-create-a-random-alpha-numeric-string-in-c but I found it a bit too verbose for this simple task. Look up tables can sometimes do wonders void gen_random char s const..
http://stackoverflow.com/questions/45972/mmap-vs-reading-blocks memory mapping for you and it's transparent. Final Update Look people across a lot of different platform combinations of OS..
Convert Python program to C/C++ code? http://stackoverflow.com/questions/4650243/convert-python-program-to-c-c-code c code generation share improve this question Yes. Look at Cython . It does just that Converts Python to C for speedups...
Regular expression to detect semi-colon terminated C++ for & while loops http://stackoverflow.com/questions/524548/regular-expression-to-detect-semi-colon-terminated-c-for-while-loops substrings # ¦and ends with a closing parenthesis # Look for a sequence of balanced substrings # Finally the outer closing.. substrings # ¦and ends with a closing parenthesis # Look for a sequence of balanced substrings # Finally the outer closing..
How to build Qt for Visual Studio 2010 http://stackoverflow.com/questions/5601950/how-to-build-qt-for-visual-studio-2010 . Just copy and paste it into the command line. Look in the Qt reference manual for what flag to use or not to use...
App does not run with VS 2008 SP1 DLLs, previous version works with RTM versions http://stackoverflow.com/questions/59635/app-does-not-run-with-vs-2008-sp1-dlls-previous-version-works-with-rtm-versions . Open every dll and exe in your solution. Look under 'XP Theme Manifest'. Check that the 'version' attribute..
List of C++ name resolution (and overloading) rules http://stackoverflow.com/questions/7374588/list-of-c-name-resolution-and-overloading-rules A X use argument dependent lookup . This is the hard part. Look for A in the namespace the type of X was declared in in the..
Is string::c_str() no longer null terminated in C++11? http://stackoverflow.com/questions/7554039/is-stringc-str-no-longer-null-terminated-in-c11 now required to use null terminated buffers internally. Look at the definition of operator 21.4.5 Requires pos size . Returns.. value charT the referenced value shall not be modified. Looking back at c_str 21.4.7.1 1 we see that it is defined in terms..
http://stackoverflow.com/questions/9860667/writing-robust-color-and-size-invariant-circle-detection-with-opencv-based-on of domain specific knowledge is often underestimated. Look at it this way in the first approach we try to approximate some..
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