This is probably going to be a really simple explanation, but I'm going to give as much backstory as possible in case I'm wrong. Advanced apologies for being so verbose. I'm using gcc4.5, and I realize the c++0x support is still somewhat experimental, but I'm going to act on the assumption that there's a non-bug related reason for the ...
Hi All, Suppose I have a variadic template function like template<typename... Args> unsigned length(Args... args); How do I find the length of the parameter list using the length function ? ...
I want to initialize a linked list with pointer arguments like so: /* * Initialize a linked list using variadic arguments * Returns the number of structures initialized */ int init_structures(struct structure *first, ...) { struct structure *s; unsigned int count = 0; va_list va; va_start(va, first); for (s = f...
I'm having problems in Visual Studio 2003 with the following: void foo(const char*& str, ...) { va_list args; va_start(args, str); const char* foo; while((foo = va_arg(args, const char*)) != NULL) { printf("%s\n", foo); } } When I call it: const char* one = "one"; foo(one, "two", "three", NULL); I get: ...
I'm trying to create a variable length function (obviously, heh) in C++, and what I have right now works, but only for the first argument. If someone could please let me know how to get this working with all the arguments that are passed, I would really appreciate it. Code: void udStaticObject::accept( udObjectVisitor *visitor, ... ) {...
I have a variadic template function: template<typename T, typename ArgType> vector<T> createVector(const int count, ...) { vector<T> values; va_list vl; va_start(vl, count); for (int i=0; i < count; ++i) { T value = static_cast<T>(va_arg(vl, ArgType)); values.push_back(value); } va_end(vl); return values; } Thi...
Let's say I have a variadic function foo(int tmp, ...), when calling foo function I need to know how many arguments there are. I'm aware of two ways of finding out how many arguments there are: Use a final argument when calling foo, like -1, so your function call will be like this: foo(tmp, 1, 2, 9, -1) and when you are inside foo and...
Hi all, recently i came across this function (used in a logger class). I understand what it does, but i do not know how: void Reporter::print( const char* szFormat, ...) { // note: m_out is a FILE* va_list args; va_start(args, szFormat); vfprintf( m_out, szFormat, args); va_end(args); } I read the reference, but s...
I have this code inside a constructor of a class (not written by me) and it writes a variable arg list to a tmp file. I wondered why this would be needed? The tmpfile is removed after this ctor goes out of scope and the var arg list sits inside the m_str vector. Can someone suggest a better way of doing this without the use of a tmp...
Hello, Here's an example of what i'm trying to achieve. I'm trying to create a macro, that would look like this: SOMEMACRO(obj, obj, obj, ..., obj); The macro would compile to: some_function(obj, obj, obj, ..., obj, SOMETHING_ELSE, SOMETHING_ELSE); Here's an example macro for a 1 parameter function: #define SOMEMACRO(x) some_func...
I need a function which takes an arbitrary number of arguments (All of the same type), does something whith them and afterwards gives a result back. A list of arguments is impracticable in my specific case. As I looked through the haskell libs, there is the function printf from module Text.Printf, which uses a similar trick. Poorly I co...
Is there any trick to get the type of the passed in arguments without explicitly stating the type in a string as one of the argument? To add on the post just now, basically what I want to do is if is type A call functionA else if is type B call functionB. Could variadic template solve that? Thanks. ...
In my current project there's some variadic functions being used (ellipsis) that are really being used quite ofen. I have to make some impacting changes to the project, so I thought i might as well get rid of these variadics too. The question I have is, how does one best replace these if the number of arguments passed to these are so v...
I'm creating a function (possibly member function, not that it matters... maybe it does?) that needs to accept an unknown number of arguments, but I want all of them to be the same type. I know I could pass in an array or vector, but I want to be able to accept the list of args directly without extra structure or even extra brackets. I...
Hello I wanted to write a function with a variable argument list. I want to explore my options. I'm pretty sure I came accross a boost template class that was designed for this purpose, but I can't think of the name of it? Can anyone tell me? or did I dream this up! Thanks ...
I want to write a simple adder (for giggles) that adds up every argument and returns a sum with appropriate type. Currently, I've got this: #include <iostream> using namespace std; template <class T> T sum(const T& in) { return in; } template <class T, class... P> auto sum(const T& t, const P&... p) -> decltype(t + sum(p...)) { ...
Does Smalltalk(especially Squeak/Pharo) have some form of variadic functions? I was just reading about the power of designing your own control statments in smalltalk and while I'm a big fan of ifTrue: ifFalse: I was having a hard time coming up with a good way to implement arbitrary if,if else, if else,...,else statements thinking how u...
When subclassing in objective-c, how can I forward a call to the superclass in the case of a variadic method. By what should I replace the ??? below to send all the objects I got? - (void) appendObjects:(id) firstObject, ... { [super appendObjects: ???]; } ...
Dear all, In Java, we can use variadic function in the following way: public Set packStrings(String...strings){ for (String str : strings){ //Do something on the str } //How to convert strings into a Set? } My question is, what is the type of "strings"? is it String[]? How to put the string(s) denoted by the "st...