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c++ Programming Glossary: forWhat 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 did not change in C 11 Reserved in any scope including for use as implementation macros identifiers beginning with an underscore.. an uppercase letter 2.11 is reserved to the implementation for any use. Each name that begins with an underscore is reserved.. with an underscore is reserved to the implementation for use as a name in the global namespace. 165 165 Such names are..
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 being subjectively slow there's a simple way to find performance problems. Just halt it several times and each time look.. this will prove or disprove it. You may have multiple performance problems of different sizes. If you clean out any one of.. themselves. They will say that profilers give you this information but that is only true if they sample the entire call stack...
http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three copying scenarios. The initialization person b a is performed by the copy constructor . Its job is to construct a fresh.. the state of an existing object. The assignment b a is performed by the copy assignment operator . Its job is generally a.. nor the destructor ourselves these are implicitly defined for us. Quote from the standard The ... copy constructor and copy..
Undefined Behavior and Sequence Points http://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points you want to critique the idea of providing an FAQ in this form then the posting on meta that started all this would be the.. of all function arguments if any which takes place before execution of any expressions or statements in the function.. designates a function invocation and the operands form an argument list without an implied sequence point between..
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 not in the header they wouldn't be accessible and therefore the compiler wouldn't be able to instantiate the template... file then implement the class in an implementation file for example .tpp and include this implementation file at the end..
What is the slicing problem in C++? http://stackoverflow.com/questions/274626/what-is-the-slicing-problem-in-c losing part of the information some of it is sliced away. For example class A int foo class B public A int bar So an object..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom modified. Namely the size is wrong and the data is gone For a strong exception guarantee it would need to be something akin..
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 some fraction f of the time and thus costs that much . For simplicity suppose we don't know what f is but assume it is..
Undefined Behavior and Sequence Points http://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points the expression its evaluation has some side effect s . For example int x y where y is also an int In addition to the initialization.. that are not lexically part of the full expression. For example subexpressions involved in evaluating default argument.. order in which side effects take place is unspecified . For example int x 5 y 6 int z x y it is unspecified whether x or..
http://stackoverflow.com/questions/4421706/operator-overloading postfix is explicitly needed. Binary arithmetic operators For the binary arithmetic operators do not forget to obey the third.. of a const reference. Operators for Pointer like Types For defining your own iterators or smart pointers you have to overload.. almost always need both a const and a non const version. For the operator value_type must be of class or struct or union..
http://stackoverflow.com/questions/4810664/how-do-i-use-arrays-in-c process since it is no longer part of the type T . Pro Forgetting the size of an array on the type level allows a pointer.. to pointer decay can x and x 0 be used interchangeably. For example T p array 0 rewritten as array 0 decay happens due to.. pointer .... x . int 8 .... ^ ^ x 0 x 8 int For example if you want to sort an array both of the following would..
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 creates a new class with the given template argument. For example template typename T struct Foo T bar void doSomething..
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 U dummy template struct inUnion T template typename T For the last node Tn. struct UnionNode T void ... template typename.. the actual data and an index to store the current type. For quite a few functions I'd like a meta function to determine.. to determine if a type U is one of the types T1..Tn . For instance I've got a member template typename U union_cast U..
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 with local variables can be worked out ahead of time. For this reason local variables are usually generated as storage.. something dangerous that could be breaking the rules. For further reading What if C# did allow returning references Coincidentally..
error LNK1169: one or more multiply defined symbols found http://stackoverflow.com/questions/12132453/error-lnk1169-one-or-more-multiply-defined-symbols-found private static const int discount 10 STATIC DISCOUNT OF 10 FOR ALL Registered Clients public RegisteredClient string ph_num.. protected int discount A SPECIAL INDIVIDUAL DISCOUTN FOR VIP Clients public VIPClient string ph_num string n string i..
gcc linker errors on fedora: undefined reference http://stackoverflow.com/questions/12376897/gcc-linker-errors-on-fedora-undefined-reference is NO warranty not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. root@myTestMachine kash # c linker fedora..
How to make generic computations over heterogeneous argument packs of a variadic template function? http://stackoverflow.com/questions/14261183/how-to-make-generic-computations-over-heterogeneous-argument-packs-of-a-variadic #include type_traits #include utility META FUNCTIONS FOR EXTRACTING THE n th TYPE OF A PARAMETER PACK Declare primary.. nth_type_of sizeof... Ts 1 Ts... type FUNCTIONS FOR EXTRACTING THE n th VALUE OF AN ARGUMENT PACK Base step template.. sizeof... Ts 1 std forward Ts args ... METAFUNCTION FOR COMPUTING THE UNDERLYING TYPE OF HOMOGENEOUS PARAMETER PACKS..
http://stackoverflow.com/questions/1455458/c-struct-alignment-question #include arpa inet.h struct packed_with_bit_fields ONLY FOR COMPARISON unsigned int a 3 unsigned int b 1 unsigned int c..
http://stackoverflow.com/questions/14932315/how-to-compile-qt-5-under-windows-or-linux-32-or-64-bit-static-or-dynamic-on-v Click Add Give it a name choose the appropriate compiler FOR VISUAL STUDIO EXPRESS DO NOT SELECT amd64 FOR 64 BIT IT WON'T.. compiler FOR VISUAL STUDIO EXPRESS DO NOT SELECT amd64 FOR 64 BIT IT WON'T WORK CHOOSE x86_amd64 INSTEAD Click OK. Now..
http://stackoverflow.com/questions/15482508/what-is-an-example-of-a-difference-in-allowed-usage-or-behavior-between-an-xvalu allowed usage or behavior between an xvalue and a prvalue FOR NON POD objects What are rvalues lvalues xvalues glvalues and..
Compiling multithread code with g++ http://stackoverflow.com/questions/19463602/compiling-multithread-code-with-g is NO warranty not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Command to compile g main.cpp o main.out..
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
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 is NO warranty not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. What is wrong with my test code UPDATE..
Unique class type Id that is safe and holds across library boundaries http://stackoverflow.com/questions/922442/unique-class-type-id-that-is-safe-and-holds-across-library-boundaries id unique for DERIVED NOT SURE IT WILL BE REALLY UNIQUE FOR EACH CLASS static const int id reinterpret_cast int typeid DERIVED.. ALWAYS VALID BUT STRING NOT INT BUT VALID AND CROSS PLATFORM CROSS VERSION COMPATBLE AS FAR AS YOU KEEP THE CLASS NAME return..
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