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c++ Programming Glossary: hereWhat is the difference between a definition and a declaration? http://stackoverflow.com/questions/1410563/what-is-the-difference-between-a-definition-and-a-declaration define something that's been declared and referenced somewhere then the linker doesn't know what to link references to and.. to other questions I'll paste a quote from the C standard here. At 3.1 2 C 03 says A declaration is a definition unless it.. forward declaration is something of a misnomer since there are no other forms of class declarations in C . Thanks to litb..
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 New addition to my rule Don't use double underscores anywhere which is easy as I rarely use underscore. After doing research.. other reserved prefixes and suffixes ... can be found there'. The POSIX 2008 reserved symbols are defined here. The restrictions.. found there'. The POSIX 2008 reserved symbols are defined here. The restrictions are somewhat more nuanced than those above...
http://stackoverflow.com/questions/3106110/what-is-move-semantics into move semantics. Note that only in the first line where we copy x is this deep copy really necessary because we might.. to a string data that.data that.data 0 What have we done here Instead of deeply copying the heap data we have just copied.. source had been modified. Since we don't really do a copy here we call this constructor a move constructor . Its job is to..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom didn't have any singular what is it question and answer so here it is. Here is a partial list of places where it was previously.. answer so here it is. Here is a partial list of places where it was previously mentioned What are your favorite C Coding.. duplicates all the code we've already written elsewhere and that's a terrible thing. In our case the core of it is only..
http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three main person a Bjarne Stroustrup 60 person b a What happens here b a And here If you are puzzled by the name name age age part.. Bjarne Stroustrup 60 person b a What happens here b a And here If you are puzzled by the name name age age part this is called.. destructor. Let us go back in time to pre standard C . There was no such thing as std string and programmers were in love..
Undefined Behavior and Sequence Points http://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points Answers to that question are monitored in the C chatroom where the FAQ idea started out in the first place so your answer is.. of an expression produces something and if in addition there is a change in the state of the execution environment it is.. evaluation has some side effect s . For example int x y where y is also an int In addition to the initialization operation..
http://stackoverflow.com/questions/4421706/operator-overloading according to votes rather than the time they were given here's an index of the answers in the order in which they make most.. Answers to that question are monitored in the C chatroom where the FAQ idea started out in the first place so your answer is.. users code will behave surprisingly. Assignment Operator There's a lot to be said about assignment. However most of it has..
http://stackoverflow.com/questions/4810664/how-do-i-use-arrays-in-c do I use arrays in C C inherited arrays from C where they are used virtually everywhere. C provides abstractions.. arrays from C where they are used virtually everywhere. C provides abstractions that are easier to use and less error.. is missing in this FAQ write an answer and link it here as an additional part. In the following text array means C array..
Why is iostream::eof inside a loop condition considered wrong? http://stackoverflow.com/questions/5605125/why-is-iostreameof-inside-a-loop-condition-considered-wrong Against this int data while inStream data when we land here we can be sure that the read was successful. if it wasn't the..
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 and why do I have to put the &ldquo template&rdquo and &ldquo.. and &ldquo typename&rdquo keywords In templates where and why do I have to put typename and template on dependent.. public Tail ... template typename U struct inUnion Q where to add typename template here typedef Tail inUnion U dummy template..
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 stolen key and look in the drawer. Your book is still there. Astonishing How can that be Aren't the contents of a hotel.. that scenario can happen in the real world no problem. There is no mysterious force that causes your book to disappear when.. you are no longer authorized to be in the room. Nor is there a mysterious force that prevents you from entering a room with..
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 do I find the current C or C standard documents For many questions.. the answer seems to be found in the standard . However where do we find that online Googling can sometimes feel futile again.. since these are the ones I am searching for right now where are there good online resources for C89 C99 C 03 C 11 c c standards..
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 processing a sorted array faster than an unsorted array Here is a piece of C code that seems very peculiar. For some strange..
http://stackoverflow.com/questions/1265039/using-std-namespace and can cause all sorts of non obvious ambiguities. Here are some common identifiers that are in the std namespace count..
Do-While and if-else statements in C/C++ macros http://stackoverflow.com/questions/154136/do-while-and-if-else-statements-in-c-c-macros wrapped in what seems like a meaningless do while loop. Here are examples. #define FOO X do f X g X while 0 #define FOO X..
How come a non-const reference cannot bind to a temporary object? http://stackoverflow.com/questions/1565600/how-come-a-non-const-reference-cannot-bind-to-a-temporary-object I don't think even these extra answers will satisfy you. Here is a final attempt summary The C committee decided it doesn't..
Why does an overridden function in the derived class hide other overloads of the base class? http://stackoverflow.com/questions/1628768/why-does-an-overridden-function-in-the-derived-class-hide-other-overloads-of-the 33 2 warning no newline at end of file Exit code 1 Here the Derived class's function is eclipsing all functions of same..
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 that necessitates this conversion has undefined behavior. Here it's definitely undefined behavior. The ambiguity comes from..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom any singular what is it question and answer so here it is. Here is a partial list of places where it was previously mentioned.. but it needs operator to work correctly. A failed solution Here's how a naive implementation might look the hard part dumb_array..
http://stackoverflow.com/questions/4421706/operator-overloading sure to always implement both prefix and postfix versions. Here is the canonical implementation of increment decrement follows.. etc. changing their left argument should be a member. Here is the exemplary code for and the other binary arithmetic operators..
When to use virtual destructors? http://stackoverflow.com/questions/461203/when-to-use-virtual-destructors Derived public Base ~Derived Do some important cleanup Here you'll notice that I didn't declare Base's destructor to be.. at the following snippet Base b new Derived use b delete b Here's the problem Since Base's destructor is not virtual and b is..
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 to explain the battle a bit better. Update 13 04 2011 Here are three perfect examples of someone who is using the STL to..
Why is the type of the main function in C and c++ left to the user to define? http://stackoverflow.com/questions/5296163/why-is-the-type-of-the-main-function-in-c-and-c-left-to-the-user-to-define and int main c c main share improve this question Here is what the C standard says ISO C 9899 1999 5.1.2.1 Freestanding..
What are access specifiers? Should I inherit with private, protected or public? http://stackoverflow.com/questions/5447498/what-are-access-specifiers-should-i-inherit-with-private-protected-or-public Inheritance Public Inheritance Protected inheritance Here are the member access rules with respect to each of these First..
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 h THouse begin h THouse.Create 'My house' ... h.Free h nil Here I first construct the house and get hold of its address. Then.. uh oh what happened to our first house ... h.Free h nil Here we overwrote the contents of the h variable with the address.. h1 nil h2.OpenFrontDoor uh oh what happened to our house Here the house was torn down through the reference in h1 and while..
http://stackoverflow.com/questions/589575/size-of-int-long-etc C I'm using Visual Studio 2008 on a 32 bit architecture. Here is what I get char 1 byte short 2 bytes int 4 bytes long 4 bytes..
How to generate a stacktrace when my gcc C++ app crashes http://stackoverflow.com/questions/77005/how-to-generate-a-stacktrace-when-my-gcc-c-app-crashes fault. Documentation can be found in the libc manual . Here's an example program that installs a SIGSEGV handler and prints.. and function that each frame in the stack came from. Here you can see the signal handler on top of the stack and the libc..
What is the difference between char a[] = “string”; and char *p = “string”; http://stackoverflow.com/questions/9460260/what-is-the-difference-between-char-a-string-and-char-p-string I even dont understand the statement. char a string Here what is operator Is it a part of a string or it has some specific..
DirectX 11 framebuffer capture (C++, no Win32 or D3DX) http://stackoverflow.com/questions/10623787/directx-11-framebuffer-capture-c-no-win32-or-d3dx D3D11_MAP_READ 0 resource resource.pData TEXTURE DATA IS HERE const int pitch width 2 const unsigned char source static_cast.. 0 resource resource.pData TEXTURE DATA IS HERE const int pitch width 2 const unsigned char source static_cast..
How to break out of a loop from inside a switch? http://stackoverflow.com/questions/1420029/how-to-break-out-of-a-loop-from-inside-a-switch case MSGTYPE ... break ... more stuff ... case DONE break HERE I want to break out of the loop itself Is there any direct..
Reading through file using ifstream http://stackoverflow.com/questions/1619604/reading-through-file-using-ifstream curr_str char curr_ch int curr_int float curr_float cout HERE n inFile curr_str cout Read curr_str endl The problem is when..
Enumerate COM object (IDispatch) methods using ATL? http://stackoverflow.com/questions/2112302/enumerate-com-object-idispatch-methods-using-atl dispatch DISPID dispid WCHAR member YOUR FUNCTION NAME HERE DISPPARAMS dispparams Get your pointer to the IDispatch interface..
Why can't we declare a std::vector<AbstractClass>? http://stackoverflow.com/questions/2160920/why-cant-we-declare-a-stdvectorabstractclass public virtual void IamFunny cout INSERT JOKE HERE class FunnyContainer private std vector IFunnyInterface funnyItems..
Using getopt to parse program arguments in c++ http://stackoverflow.com/questions/2219562/using-getopt-to-parse-program-arguments-in-c
C++ - repeatedly using istringstream http://stackoverflow.com/questions/2767298/c-repeatedly-using-istringstream pro konverzi while getline file row separate.str row HERE is PROBLEM while getline separate strNum ' ' using delimiter..
http://stackoverflow.com/questions/2848087/how-to-clear-stringstream parser parser 5 short top 0 parser top parser.str HERE I'M RESETTING parser parser 6 DOESN'T PUT 6 INTO parser short..
Dynamically register constructor methods in an AbstractFactory at compile time using C++ templates http://stackoverflow.com/questions/2850213/dynamically-register-constructor-methods-in-an-abstractfactory-at-compile-time-u 11 PongMessage public PongMessage HERE virtual void say printf Pong n would result in..
OneOfAType container — storing one each of a given type in a container — am I off base here? http://stackoverflow.com/questions/3221501/oneofatype-container-storing-one-each-of-a-given-type-in-a-container-am-i GetFileName const return fileName_ RELEVANT METHOD HERE template typename T T Get std vector Entry iterator foundItem..
http://stackoverflow.com/questions/3846333/c-does-not-name-to-a-type int agentX int agentY char agentDir Agent agent ERROR IS HERE #endif ENVIRONMENT_H_INCLUDED c class object header files ..
How to compile ASL (boost based Adobe C++ gui library) on linux? http://stackoverflow.com/questions/6461621/how-to-compile-asl-boost-based-adobe-c-gui-library-on-linux hash 1 1 dev null 2 dev null WD `pwd` MACHINE `uname` HERE `dirname 0` cd HERE if 1 then ASL_DISTRO_SITE 1 fi #http surfnet.dl.sourceforge.net.. 2 dev null WD `pwd` MACHINE `uname` HERE `dirname 0` cd HERE if 1 then ASL_DISTRO_SITE 1 fi #http surfnet.dl.sourceforge.net.. mv INTEL_TBB_NAME adobe_root intel_tbb_libraries fi cd HERE echo_run adobe_root adobe_source_libraries tools patch_boost.sh..
Simple variadic template function can't instantinate http://stackoverflow.com/questions/7108161/simple-variadic-template-function-cant-instantinate constexpr size_t num_args Line 16 return 1 num_args T... HERE int main std cout num_args int int int This errors at HERE with.. HERE int main std cout num_args int int int This errors at HERE with No matching function call to ... ... candidate is template..
http://stackoverflow.com/questions/7344226/buffer-overflow-attack nEnter d HEX Values n n Buffer Overflow vulnerability HERE for i 0 i n i scanf x a i printf Done reading junk numbers n..
Read and Write on serial port in Ubuntu with C/C++ and LibSerial http://stackoverflow.com/questions/9046649/read-and-write-on-serial-port-in-ubuntu-with-c-c-and-libserial COMMAND while 1 char next_byte serial_port.get next_byte HERE I RECEIVE THE FIRST ANSWER std cerr next_byte std cerr std endl..
Why does the compiler select the base class constructor inside the template argument list? http://stackoverflow.com/questions/9223441/why-does-the-compiler-select-the-base-class-constructor-inside-the-template-argu T struct A private T struct C public A B C A B ERROR HERE Live example on Ideone. Output prog.cpp 1 9 error 'struct B..
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