c++ Programming Glossary: noWhat is an undefined reference/unresolved external symbol error and how do I fix it? http://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved-external-symbol-error-and-how-do-i-fix translation is specified by the following phases see footnote . Physical source file characters are mapped in an implementation.. and universal character name in a character literal or a non raw string literal is converted to the corresponding member.. concatenated. White space characters separating tokens are no longer significant. Each preprocessing token is converted into..
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 C to name member variables with some kind of prefix to denote the fact that they're member variables rather than local variables.. c faq share improve this question The rules which did not change in C 11 Reserved in any scope including for use as implementation.. C is based on the C standard 1.1 2 C 03 and C99 is a normative reference 1.2 1 C 03 these also apply from the 1999 C..
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 percentage of samples on which you will see it. There is no educated guesswork required. If you do have a guess as to what.. and the opportunity to get speedup . Added It might not be obvious but the stack sampling technique works equally well.. of the number of times it may occur within a sample. Another objection I often hear is It will stop someplace random..
http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three dealt with. Since we declared neither the copy constructor nor the assignment operator nor the destructor ourselves these.. neither the copy constructor nor the assignment operator nor the destructor ourselves these are implicitly defined for us... functions for some class types when the program does not explicitly declare them. The implementation will implicitly..
Undefined Behavior and Sequence Points http://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points long. So have patience while reading it. If you already know these things reading them again won't make you crazy. Pre requisites.. again won't make you crazy. Pre requisites An elementary knowledge of C Standard What are Sequence Points The Standard says.. side effects of previous evaluations shall be complete and no side effects of subsequent evaluations shall have taken place...
http://stackoverflow.com/questions/4421706/operator-overloading are binary infix operators for which the syntax specifies no restriction on whether they should be members or non members... no restriction on whether they should be members or non members. Since they change their left argument they alter the.. output and input operations for your own types you cannot change the standard library 䏭 stream types. That 䏭 why you..
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 argument in this case int . If these implementations were not in the header they wouldn't be accessible and therefore the.. from declaration but is accessible to the compiler. Another solution is to keep the implementation separated and explicitly.. instantiate all the template instances you'll need Foo.h no implementation template typename T struct Foo ... Foo.cpp..
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 struct inUnion T template typename T For the last node Tn. struct UnionNode T void ... template typename U struct.. template typename U struct inUnion char fail sizeof U Cannot be instantiated for any U template struct inUnion T The problem.. name and VC is quite right in choking on it. I also know that I should be able to add template somewhere to tell 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 p foo cout p p 8 cout p And the code is just running with no runtime exceptions The output was 5 8 How can it be Isn't the.. You steal the key A week later you return to the hotel do not check in sneak into your old room with your stolen key and.. Well obviously that scenario can happen in the real world no problem. There is no mysterious force that causes your book..
“C subset of C++” -> Where not ? examples? [closed] http://stackoverflow.com/questions/1201593/c-subset-of-c-where-not-examples If you compare C89 with C then here are a couple of things No tentative definitions in C int n int n ill formed n already.. in C int a 1 int ap a ill formed a does not have type int No K&R function definition style int b a int a ill formed grammar.. int c struct B b ill formed b has incomplete type not A B No default int auto a ill formed type specifier missing C99 adds..
Is gcc4.7 buggy about regular expressions? [duplicate] http://stackoverflow.com/questions/12530406/is-gcc4-7-buggy-about-regular-expressions about regular expressions duplicate Possible Duplicate No matches with c 11 regex I am trying to use std regex in a C.. but the code doesn't actually do anyone any harm. Noone killed your puppy. It's obvious within a few minutes it doesn't.. progress and we shipped lots of partial implementations. Noone thought it would remain unusable for so long so with hindsight..
Best way to detect integer overflow in C/C++ http://stackoverflow.com/questions/199333/best-way-to-detect-integer-overflow-in-c-c if c_test b c There has been an overflow else c c_test No overflow Is there a better way of testing for overflow I know..
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 name space if any of its associated headers is included. No other identifiers are reserved. If the program declares or defines..
What is the difference between new/delete and malloc/free? http://stackoverflow.com/questions/240212/what-is-the-difference-between-new-delete-and-malloc-free of space. Reallocating larger chunk of memory simple No copy constructor to worry about They will NOT call new delete.. constructor to worry about They will NOT call new delete No way to splice user code into the allocation sequence to help..
When and why will an OS initialise memory to 0xCD, 0xDD, etc. on malloc/free/new/delete? http://stackoverflow.com/questions/370195/when-and-why-will-an-os-initialise-memory-to-0xcd-0xdd-etc-on-malloc-free-new writing through dangling pointers. 0xED or Aligned Fence 'No man's land' for aligned allocations. Using a 0xBD different.. values are non zero constant odd large and atypical Non zero values help find bugs assuming zero filled data. Constant.. an inaccessible address under 3gb. static unsigned char _bNoMansLandFill 0xFD fill no man's land with this static unsigned..
RAII and smart pointers in C++ http://stackoverflow.com/questions/395123/raii-and-smart-pointers-in-c something like File file path to file Do stuff with file No need to close it destructor will do that for us The reason this.. new std string Do cool things to or using str return str Now shared_ptr will count the number of references to str. For.. std string str foo shared_ptr std string str2 str Now there are two references to the same string. Once there are..
http://stackoverflow.com/questions/408670/stack-static-and-heap-in-c itself. There is only one copy for the entire program. No matter how many times you go into a function call or class and..
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 declared by the compiler and not explicitly by the user No private or protected non static data members . You can have.. aggregate even it is an array of non aggregate class type. Now let's look at some examples class NotAggregate1 virtual void.. class type. Now let's look at some examples class NotAggregate1 virtual void f remember no virtual functions class..
What is the proper declaration of main? http://stackoverflow.com/questions/4207134/what-is-the-proper-declaration-of-main to take its address. The return type of main must be int . No other return type is allowed this rule is in bold because it.. the case. argv argc is guaranteed to be a null pointer. Note that since an array type argument like char is really just.. passed to the exit function which terminates the program. Note that all of this applies only when compiling for a hosted..
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 These members are only accessible from within the class. No outside Access is allowed. An Source Code Example class MyClass.. int c int main MyClass obj obj.a 10 Allowed obj.b 20 Not Allowed gives compiler error obj.c 30 Not Allowed gives compiler.. Allowed obj.b 20 Not Allowed gives compiler error obj.c 30 Not Allowed gives compiler error Inheritance and Access Specifiers..
WChars, Encodings, Standards and Portability http://stackoverflow.com/questions/6300804/wchars-encodings-standards-and-portability with a well defined I O interface to UTF using iconv Note that issues like Unicode normalization or diacritic replacement.. agnostic program core using only pure standard C C No and there is no way at all to fulfill all these properties at..
Difference between private, public, and protected inheritance in C++ http://stackoverflow.com/questions/860339/difference-between-private-public-and-protected-inheritance-in-c children are aware that Base contains protectedMember. No one but Base is aware of privateMember. By is aware of I mean..
Which kind of pointer do I use when? http://stackoverflow.com/questions/8706192/which-kind-of-pointer-do-i-use-when normally happen two resources can't own each other. Note that Boost additionally offers shared_array which might be.. don't use operations that need copyable types obviously . Note again that Boost has an array version scoped_array which the.. T also offers operator instead of operator and operator . Note that std auto_ptr is still in the standard but it is deprecated..
Correct Code - Non-blocking pipe with popen http://stackoverflow.com/questions/10962044/correct-code-non-blocking-pipe-with-popen tons of questions about non blocking pipes but there are NO examples of code that can be copy paste with little correction..
Aliasing `T*` with `char*` is allowed. Is it also allowed the other way around? http://stackoverflow.com/questions/12612488/aliasing-t-with-char-is-allowed-is-it-also-allowed-the-other-way-around unsigned c huh Summary of the answers The answer is NO for two reasons You an only access an existing object as char..
Xcode 3.2.1 and C++ string fails! http://stackoverflow.com/questions/1603300/xcode-3-2-1-and-c-string-fails option which does not exist in 3.2.1 the code runs with NO PROBLEM. Does anybody know what's going on Thanks Yuval c xcode..
BOOST libraries in multithreading-aware mode http://stackoverflow.com/questions/2293962/boost-libraries-in-multithreading-aware-mode confused by having BOOST Threads library compiled in NO thread aware regime with no mt in the name . It does not make..
Simulating key press events in Mac OS X http://stackoverflow.com/questions/2379867/simulating-key-press-events-in-mac-os-x CGEventCreateKeyboardEvent source CGKeyCode 1 NO CGEventPost kCGAnnotatedSessionEventTap saveCommandDown CGEventPost..
What exactly is a reentrant function? http://stackoverflow.com/questions/2799023/what-exactly-is-a-reentrant-function reentrancy problems. 7.1. Make sure all functions have NO state. They must only use the parameters their own local variables..
Determine if two rectangles overlap each other? http://stackoverflow.com/questions/306316/determine-if-two-rectangles-overlap-each-other contradiction. Any one of four conditions guarantees that NO OVERLAP CAN EXIST. Cond1. If A's left edge is to the right of.. And A's top above B's bottom And A's bottom below B's Top NOTE1 It is fairly obvious this same principle can be extended.. principle can be extended to any number of dimensions. NOTE2 . It should also be fairly obvious that to count overlaps..
C++ Logging Library recommendation [closed] http://stackoverflow.com/questions/3084052/c-logging-library-recommendation case I know because I participated in the discussion that NO existing logging library would have fulfilled the requirements...
Using C/C++ static libraries from iPhone ObjectiveC Apps http://stackoverflow.com/questions/376966/using-c-c-static-libraries-from-iphone-objectivec-apps unresolved issues because the C compiler has absolutely NO idea that it should link to the C runtime and why would it right..
send RSA public key to iphone and use it to encrypt http://stackoverflow.com/questions/4211484/send-rsa-public-key-to-iphone-and-use-it-to-encrypt cipherBuffer length cipherBufferSize else success NO break Free the Security Framework Five CFRelease cert CFRelease..
Does std::list::remove method call destructor of each removed element? http://stackoverflow.com/questions/4260464/does-stdlistremove-method-call-destructor-of-each-removed-element know that. Has p been allocated dynamically The answer is NO but the runtime doesn't know that. Dangling pointers There is.. new Foo Foo q p Has q already been released The answer is NO but the runtime doesn't know that. ...suppose that pointees.. . Foo p Has p been properly initialized The answer is NO but the runtime doesn't know that. Dynamic arrays The type system..
Why/when is __declspec( dllimport ) not needed? http://stackoverflow.com/questions/4489441/why-when-is-declspec-dllimport-not-needed prompt cl.exe OUT U libs Debug server.dll INCREMENTAL NO NOLOGO DLL MANIFEST MANIFESTFILE Debug server.dll.intermediate.manifest.. prompt cl.exe OUT U libs Debug server.dll INCREMENTAL NO NOLOGO DLL MANIFEST MANIFESTFILE Debug server.dll.intermediate.manifest..
Get “Access is denied” when trying to compile with g++ from command line. Cygwin http://stackoverflow.com/questions/5033463/get-access-is-denied-when-trying-to-compile-with-g-from-command-line-cygwin software see the source for copying conditions. There is NO warranty not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR..
Why doesn't java support pass by reference like C++ http://stackoverflow.com/questions/5298421/why-doesnt-java-support-pass-by-reference-like-c as well because most of the answer just plainly say NO. Thanks. java c pass by reference share improve this question..
http://stackoverflow.com/questions/5969173/how-to-swig-in-vs2010 d Linker Enable Incremental Linking set as No INCREMENTAL NO e Linker Input Additional Dependencies add PYTHON_LIB ... f..
error: passing xxx as 'this' argument of xxx discards qualifiers http://stackoverflow.com/questions/5973427/error-passing-xxx-as-this-argument-of-xxx-discards-qualifiers is not allowed because non const member functions make NO PROMISE not to modify the object so the compiler is going to..
Do I need to manually close a ifstream? http://stackoverflow.com/questions/748014/do-i-need-to-manually-close-a-ifstream resources ifstream raii share improve this question NO This is what RAII is for let the destructor do its job. There..
What is the correct link options to use std::thread in GCC under linux? http://stackoverflow.com/questions/8649828/what-is-the-correct-link-options-to-use-stdthread-in-gcc-under-linux software see the source for copying conditions. There is NO warranty not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR..
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