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Questions tagged [variadic]

In computer science, an operator or function is variadic if it can take a varying number of arguments; that is, if its arity is not fixed.

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reuse of variadic arguments

I have a question regarding restarting variadic argument lists (va_list). Basically I want to do something like this: void someFunc(char* fmt, ...) { va_list ap; va_start(fmt, ap); otherFuncA(fmt, ap); // restart ap otherFuncB(fmt, ap); …
Thargon
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VS2010 C++ variadic template example

I have a class template and I can't seem to figure out how to perform a Variadic Template style instantiation. Here is the "code" so far of what I'm looking for: template class CFunctorStartExT { friend…
BabelFish
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passing variable number of arguments

Can we pass variable number of arguments to a function in c?
Shweta
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Function overloading where parameters only differ by ellipses

I've got this logging system for which I'm looking to shortcut some of the string manipulation. The logging system is used via functional macros which then forward to a single function call. E.g. #define Warning(...) LogMessage(eWarning,…
dash-tom-bang
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Variadic templates: Interlacing multiple packs

Given any number of packs, take the first type from each pack, put them together. Then the second type from each pack, put them together, etc... Then merge them all. Any leftoevers will repeat the process among themselves. For example, using…
prestokeys
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Extract just the argument type list from decltype(someFunction)

I have a variadic template that represents a list of parameters for a function, eg: void myFunc (int,int,std::string) { } template class MyTemplateClass { }; ... MyTemplateClass myConcrete; // for use with…
gimmeamilk
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How to pass multiple return values to a variadic function?

I have a Go function which returns two integer values. Below is the function func temp() (int, int){ return 1,1 } Is it possible to put temp function directly into a Println and print both the outputs using string formatting as…
rawwar
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How to find the length of a parameter pack?

Suppose I have a variadic template function like template unsigned length(Args... args); How do I find the length of the parameter list using the length function ?
Eternal Learner
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How to write C function accepting (one) argument of any type

I am implementing simple library for lists in C, and I have a problem with writing find function. I would like my function to accept any type of argument to find, both: find(my_list, 3) and find(my_list, my_int_var_to_find). I already have…
Bartek Chaber
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What is the difference between lambda capture [&args...] and [...args = std::forward(args)]

I'm writing a simple game with Entity Component System. One of my components is NativeScriptComponent. It contains the instance of my script. The idea is that I can create my NativeScriptComponent anytime and then Bind to it any class implementing…
Kyriet
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Handling a void variable in a templatized function in C++11

I have a template class that must perform some operation before calling a function whose parameters and return type are generic. This is the method: template ReturnType function (Args ...args) { // prepare…
HappyCactus
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CPP/GPP in Fortran variadic macro (plus Fortran // concatenation)

I'm trying to compile a huge, world-renowned numerical weather prediction code - written mostly in Fortran 90 - that uses cpp extensively, and successfully, with PGI, Intel and gfortran. Now, I've inherited a version where experts have added…
DonMorton
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Golang Join array interface

I try to create bulk insert. I use gorm github.com/jinzhu/gorm import ( "fmt" dB "github.com/edwinlab/api/repositories" ) func Update() error { tx := dB.GetWriteDB().Begin() sqlStr := "INSERT INTO city(code, name) VALUES (?, ?),(?,…
user2486312
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How to write a generic variadic lambda that discards its parameters?

I want to write a lambda that takes an arbitrary number of arguments by universal reference and ignores them entirely. The obvious method would be to use the syntax for a variadic universal parameter pack and omit the parameter name: auto my_lambda…
ecatmur
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How do I compile variadic templates conditionally?

Is there a macro that tells me whether or not my compiler supports variadic templates? #ifdef VARIADIC_TEMPLATES_AVAILABLE template void coolstuff(Args&&... args); #else ??? #endif If they are not supported, I guess I would…
fredoverflow
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