C++

C++ TutorialBasic input/output in c++C++ AlignmentC++ Argument Dependent Name LookupC++ Arithmitic MetaprogrammingC++ ArraysC++ Atomic TypesC++ AttributesC++ autoC++ Basic Type KeywordsC++ Bit fieldsC++ Bit ManipulationC++ Bit OperatorsC++ Build SystemsC++ C incompatibilitiesC++ C++11 Memory ModelC++ Callable ObjectsC++ Classes/StructuresC++ Client server examplesC++ Common compile/linker errors (GCC)C++ Compiling and BuildingC++ Concurrency with OpenMPC++ Const CorrectnessC++ const keywordC++ Constant class member functionsC++ constexprC++ ContainersC++ Copy ElisionC++ Copying vs AssignmentC++ Curiously Recurring Template Pattern (CRTP)C++ Date and time using chrono headerC++ Debugging and Debug-prevention Tools & TechniquesC++ decltypeC++ Digit separatorsC++ EnumerationC++ ExceptionsC++ Explicit type conversionsC++ Expression templatesC++ File I/OC++ Floating Point ArithmeticC++ Flow ControlC++ Fold ExpressionsC++ Friend keywordC++ function call by value vs. call by referenceC++ Function OverloadingC++ Function Template OverloadingC++ Futures and PromisesC++ Header FilesC++ Implementation-defined behaviorC++ Inline functionsC++ Inline variablesC++ IterationC++ IteratorsC++ KeywordsC++ LambdasC++ Layout of object typesC++ Linkage specificationsC++ LiteralsC++ LoopsC++ Memory managementC++ MetaprogrammingC++ Move SemanticsC++ mutable keywordC++ MutexesC++ NamespacesC++ Non-Static Member FunctionsC++ One Definition Rule (ODR)C++ Operator OverloadingC++ operator precedenceC++ OptimizationC++ Overload resolutionC++ Parameter packsC++ Perfect ForwardingC++ Pimpl IdiomC++ PointersC++ Pointers to membersC++ PolymorphismC++ PreprocessorC++ ProfilingC++ RAII: Resource Acquisition Is InitializationC++ Random number generationC++ Recursive MutexC++ Refactoring TechniquesC++ ReferencesC++ Regular expressionsC++ Resource ManagementC++ Return Type CovarianceC++ Returning several values from a functionC++ RTTI: Run-Time Type InformationC++ Scopes



C++ Parameter packs

From WikiOD

A template with a parameter pack[edit | edit source]

template<class ... Types> struct Tuple {};

A parameter pack is a template parameter accepting zero or more template arguments. If a template has at least one parameter pack is a variadic template.

Expansion of a parameter pack[edit | edit source]

The pattern parameter_pack ... is expanded into a list of comma-separated substitutions of parameter_pack with each one of its parameters

template<class T> // Base of recursion
void variadic_printer(T last_argument) {
    std::cout << last_argument;
}

template<class T, class ...Args> 
void variadic_printer(T first_argument, Args... other_arguments) {
  std::cout << first_argument << "\n";
  variadic_printer(other_arguments...); // Parameter pack expansion
}

The code above invoked with variadic_printer(1, 2, 3, "hello"); prints

1
2
3
hello

Credit:Stack_Overflow_Documentation