All C++ Faq Solutions on Gang of Coders

Total of 129 C++ Faq Solutions

The Definitive C++ Book Guide and List

C++C++ Faq

Does C++ support 'finally' blocks? (And what's this 'RAII' I keep hearing about?)

C++ExceptionRaiiFinallyC++ Faq

Is it possible to prevent stack allocation of an object and only allow it to be instantiated with 'new'?

C++C++ Faq

Where and why do I have to put the "template" and "typename" keywords?

C++TemplatesTypenameC++ FaqDependent Name

Restrict variadic template arguments

C++TemplatesVariadic TemplatesC++17C++ Faq

How do I remove code duplication between similar const and non-const member functions?

C++ClassConstantsCode DuplicationC++ Faq

Pointer to class data member "::*"

C++ClassPointersC++ Faq

How to write C++ getters and setters

C++Getter SetterC++ Faq

When do I use a dot, arrow, or double colon to refer to members of a class in C++?

C++C++ Faq

How do I prevent a class from being allocated via the 'new' operator? (I'd like to ensure my RAII class is always allocated on the stack.)

C++Operator OverloadingC++ Faq

Constructor initialization-list evaluation order

C++GccC++ Faq

What are POD types in C++?

C++TypesC++ Faq

What is the difference between public, private, and protected inheritance in C++?

C++InheritanceEncapsulationAccess SpecifierC++ Faq

How to pass objects to functions in C++?

C++PointersPass by-ReferencePass by-ValueC++ Faq

Why does volatile exist?

C++VolatileC++ Faq

What is the <=> ("spaceship", three-way comparison) operator in C++?

C++OperatorsC++ FaqC++20Spaceship Operator

What is "rvalue reference for *this"?

C++C++11Move SemanticsC++ FaqQualifiers

Is the 'override' keyword just a check for a overridden virtual method?

C++C++11OverridingVirtual FunctionsC++ Faq

Do the parentheses after the type name make a difference with new?

C++ConstructorInitializationNew OperatorC++ Faq

How come a non-const reference cannot bind to a temporary object?

C++ReferenceConstantsTemporaryC++ Faq

Undefined behavior and sequence points

C++Undefined BehaviorC++ FaqSequence Points

Which kind of pointer do I use when?

C++PointersC++11Smart PointersC++ Faq

Why do I have to access template base class members through the this pointer?

C++TemplatesInheritanceC++ Faq

What are the rules about using an underscore in a C++ identifier?

C++Naming ConventionsStandardsC++ Faq

What are the new features in C++17?

C++StandardsC++ FaqC++17

What is the difference between a definition and a declaration?

CDeclarationTerminologyDefinitionC++ Faq

What is the curiously recurring template pattern (CRTP)?

C++TemplatesC++ FaqCrtp

Why is it wrong to use std::auto_ptr<> with standard containers?

C++StlRaiiAuto PtrC++ Faq

What does T&& (double ampersand) mean in C++11?

C++C++11Rvalue ReferenceC++ FaqPerfect Forwarding

Why should C++ programmers minimize use of 'new'?

C++Memory ManagementHeap MemoryNew OperatorC++ Faq

Default constructor with empty brackets

C++ConstructorDefault ConstructorC++ FaqMost Vexing-Parse

How to stop C++ console application from exiting immediately?

C++ConsoleExitTerminateC++ Faq

What do the following phrases mean in C++: zero-, default- and value-initialization?

C++InitializationC++ Faq

What is std::move(), and when should it be used?

C++C++11Move SemanticsC++ FaqStdmove

What are all the common undefined behaviours that a C++ programmer should know about?

C++UndefinedUndefined BehaviorC++ Faq

What are the differences between a pointer variable and a reference variable in C++?

C++PointersReferenceC++ Faq

What does the explicit keyword mean?

C++ConstructorExplicitC++ FaqExplicit Constructor

Why is "using namespace std;" considered bad practice?

C++NamespacesStdUsing DirectivesC++ Faq

Why use apparently meaningless do-while and if-else statements in macros?

C++CC PreprocessorC++ Faq

Why is 'this' a pointer and not a reference?

C++PointersReferenceThisC++ Faq

What is "Argument-Dependent Lookup" (aka ADL, or "Koenig Lookup")?

C++Argument Dependent-LookupName LookupC++ Faq

Which C++ idioms are deprecated in C++11?

C++C++11C++ Faq

std::wstring VS std::string

C++StringUnicodeC++ FaqWstring

What is object slicing?

C++InheritanceC++ FaqObject Slicing

Meaning of 'const' last in a function declaration of a class?

C++ConstantsDeclarationC++ Faq

Is the safe-bool idiom obsolete in C++11?

C++C++11DeprecatedC++ FaqSafe Bool-Idiom

Why isn't sizeof for a struct equal to the sum of sizeof of each member?

C++CStructSizeofC++ Faq

Why is volatile not considered useful in multithreaded C or C++ programming?

C++CMultithreadingVolatileC++ Faq

What are the advantages of using nullptr?

C++C++11NullC++ FaqNullptr

What does the C++ standard state the size of int, long type to be?

C++C++ Faq

What is the proper declaration of main in C++?

C++FunctionStandardsMainC++ Faq

Which iomanip manipulators are 'sticky'?

C++C++ Faq

Overloading member access operators ->, .*

C++Operator OverloadingC++ Faq

When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used?

C++PointersCastingC++ Faq

Why are C++ inline functions in the header?

C++InlineTheoryLanguage DesignC++ Faq

When can I use a forward declaration?

C++Forward DeclarationC++ Faq

"std::endl" vs "\n"

C++Coding StyleIostreamC++ Faq

Why is iostream::eof inside a loop condition (i.e. `while (!stream.eof())`) considered wrong?

C++IostreamC++ Faq

How can I efficiently select a Standard Library container in C++11?

C++C++11C++ Faq

Why does std::getline() skip input after a formatted extraction?

C++InputIostreamIstreamC++ Faq

Polymorphism in C++

C++PolymorphismC++ Faq

Why is `std::move` named `std::move`?

C++C++11Move SemanticsRvalue ReferenceC++ Faq

Why does the use of 'new' cause memory leaks?

C++PointersMemory LeaksNew OperatorC++ Faq

Why is enum class preferred over plain enum?

C++ClassEnumsC++ Faq

How to convert a number to string and vice versa in C++

C++StringType ConversionNumericC++ Faq

When to make a type non-movable in C++11?

C++C++11Move SemanticsC++ Faq

Iterator invalidation rules for C++ containers

C++IteratorC++ Standard-LibraryC++ Faq

Proper stack and heap usage in C++?

C++Memory ManagementStackHeap MemoryC++ Faq

What C++ Smart Pointer Implementations are available?

C++Smart PointersC++ Faq

How to overload std::swap()

C++PerformanceOptimizationStlC++ Faq

Does const mean thread-safe in C++11?

C++C++11Thread SafetyConstantsC++ Faq

What is The Rule of Three?

C++Copy ConstructorAssignment OperatorC++ FaqRule of-Three

What are the basic rules and idioms for operator overloading?

C++OperatorsOperator OverloadingC++ Faq

What is the copy-and-swap idiom?

C++Copy ConstructorAssignment OperatorC++ FaqCopy and-Swap

Different floating point result with optimization enabled - compiler bug?

C++OptimizationG++C++ Faq

What are transparent comparators?

C++C++14C++ Faq

Best practices for circular shift (rotate) operations in C++

C++CRotationBit ManipulationC++ Faq

What are the main purposes of using std::forward and which problems it solves?

C++C++11Rvalue ReferenceC++ FaqPerfect Forwarding

Why doesn't a simple "Hello World"-style program compile with Turbo C++?

C++Turbo C++C++ Faq

gcc/g++: "No such file or directory"

C++CGccG++C++ Faq

How do I use arrays in C++?

C++ArraysPointersMultidimensional ArrayC++ Faq

What are template deduction guides and when should we use them?

C++TemplatesC++17C++ FaqTemplate Argument-Deduction

How do you serialize an object in C++?

C++SerializationMarshallingC++ Faq

Why can templates only be implemented in the header file?

C++TemplatesUndefined ReferenceC++ Faq

What is a smart pointer and when should I use one?

C++PointersC++11Smart PointersC++ Faq

What is move semantics?

C++C++ FaqC++11Move Semantics

What is the correct answer for cout << a++ << a;?

C++C++ Faq

C++11 rvalues and move semantics confusion (return statement)

C++C++11Move SemanticsRvalue ReferenceC++ Faq

What's the difference between "STL" and "C++ Standard Library"?

C++StlStdC++ Standard-LibraryC++ Faq

How does the compilation/linking process work?

C++Compiler ConstructionLinkerC++ Faq

What is the point of function pointers?

C++CFunctionPointersC++ Faq

Passing shared pointers as arguments

C++C++11Shared PtrC++ Faq

What exactly is the "as-if" rule?

C++COptimizationC++ FaqAs If

What are the differences between struct and class in C++?

C++OopClassStructC++ Faq

Function with same name but different signature in derived class

C++FunctionInheritanceLookupC++ Faq

When do extra parentheses have an effect, other than on operator precedence?

C++C++11Language LawyerParenthesesC++ Faq

What are copy elision and return value optimization?

C++OptimizationC++ FaqReturn Value-OptimizationCopy Elision

Copy constructor and = operator overload in C++: is a common function possible?

C++Variable AssignmentCopy ConstructorC++ Faq

Why should I use a pointer rather than the object itself?

C++C++11PointersC++ Faq

Resolve build errors due to circular dependency amongst classes

C++Compiler ErrorsCircular DependencyC++ Faq

Undefined behavior and sequence points reloaded

C++Undefined BehaviorC++ FaqSequence Points

What is external linkage and internal linkage?

C++C++ Faq

What is an undefined reference/unresolved external symbol error and how do I fix it?

C++Linker ErrorsUndefined ReferenceC++ FaqUnresolved External

What is a lambda expression in C++11?

C++LambdaC++11C++ Faq

What is the difference between const int*, const int * const, and int const *?

C++CPointersConstantsC++ Faq

What is this weird colon-member (" : ") syntax in the constructor?

C++SyntaxConstructorC++ FaqCtor Initializer

Object destruction in C++

C++ExceptionDestructorC++ FaqObject Lifetime

Why aren't my include guards preventing recursive inclusion and multiple symbol definitions?

C++Header FilesC++ FaqInclude Guards

Where do I find the current C or C++ standard documents?

C++CStandardsC++ Faq

Is the practice of returning a C++ reference variable evil?

C++ReferenceC++ Faq

Why would one replace default new and delete operators?

C++Operator OverloadingNew OperatorC++ FaqDelete Operator

Why should I not #include <bits/stdc++.h>?

C++PortabilityTurbo C++C++ FaqImplementation Defined-Behavior

What XML parser should I use in C++?

C++Xml ParsingC++ Faq

How should I write ISO C++ Standard conformant custom new and delete operators?

C++Operator OverloadingNew OperatorC++ FaqDelete Operator

What are rvalues, lvalues, xvalues, glvalues, and prvalues?

C++ExpressionC++ FaqC++11

Why do we actually need Private or Protected inheritance in C++?

C++InheritancePrivateProtectedC++ Faq

Can a class member function template be virtual?

C++TemplatesVirtual FunctionsFunction TemplatesC++ Faq

What does "cv-unqualified" mean in C++?

C++C++ Faq

What are all the member-functions created by compiler for a class? Does that happen all the time?

C++Member FunctionsC++ Faq

What happens when an exception goes unhandled in a multithreaded C++11 program?

C++MultithreadingExceptionC++11C++ Faq

What is a "span" and when should I use one?

C++C++20C++ FaqCpp Core-GuidelinesStd Span

How to get IOStream to perform better?

C++OptimizationIostreamC++ FaqC++ Standard-Library

shared_from_this causing bad_weak_ptr

C++BoostShared PtrC++ Faq

How to implement classic sorting algorithms in modern C++?

C++AlgorithmSortingC++14C++ Faq

Why should I always enable compiler warnings?

C++CWarningsCompiler WarningsC++ Faq

Should I include <xxxx.h> or <cxxxx> in C++ programs?

C++IncludeC++ Faq

When is std::weak_ptr useful?

C++11Shared PtrWeak PtrC++ Faq

What is the purpose of std::launder?

C++MemoryC++17C++ FaqStdlaunder

What changes introduced in C++14 can potentially break a program written in C++11?

C++C++11C++14Language LawyerC++ Faq