Solved

parameters

Posted on 2000-04-10
10
245 Views
Last Modified: 2010-04-02

Hi,

What is the maximum nor of parameters can we pass in a function?

bye
cbasavaraj
0
Comment
Question by:cbasavaraj
  • 2
  • 2
  • 2
  • +3
10 Comments
 
LVL 4

Expert Comment

by:captainkirk
ID: 2701365
I don't believe there is a maximum defined, but since function parameters are passed on the stack, I would assume (correct me if I'm wrong) that the maximum stack size would determine where you hit the wall on this one...
0
 
LVL 22

Expert Comment

by:nietod
ID: 2701491
>> I don't believe there is a maximum defined,
right, there is no maximum

>> I would assume (correct me if I'm wrong) that
>> the maximum stack size
The maximum stack size is the upper theoretical limit.  The actual limit will be less than that because there will be other things on the stack as well.

0
 
LVL 4

Expert Comment

by:captainkirk
ID: 2701504
that would be more precisely correct...
0
DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

 
LVL 84

Expert Comment

by:ozo
ID: 2701674
There may be an implementation defined limit, but a conforming implementation shall be able to translate a program containing at least 31 parameters.
0
 
LVL 9

Expert Comment

by:jasonclarke
ID: 2701807
the standard actually says:

The limits may constrain quantities that include those described below
  or others.  The bracketed number following  each  quantity  is  recom-
  mended  as  the  minimum for that quantity.  However, these quantities
  are only guidelines and do not determine compliance.

--Parameters in one function definition [256].

....so if there is no actual figure specified by the standard, but 256 must be assumed to be a reasonable minimum...


0
 
LVL 22

Expert Comment

by:nietod
ID: 2702000
What section is that from?  I don't remember that.
0
 
LVL 9

Expert Comment

by:jasonclarke
ID: 2703172
its in the limits section - in the draft at least - which I think is almost the last appendix.

As it says though, these things are only guidelines and useful minimums, they do not make or break standards conformance.
0
 
LVL 4

Expert Comment

by:abancroft
ID: 2703914
Looks like there is no maximum other than the stack size, but if you do run into some limit (e.g. one imposed by your compiler), you can always define a struct that stores the parameters, then allocate an instance of the struct on the heap (using new) & pass a pointer to it.

Don't forget to delete the struct after the call.

Or even better, use auto_ptr.
0
 
LVL 84

Expert Comment

by:ozo
ID: 2705229
and I was looking at the C standard, not the C++ standard.

of course, there may be an implementation imposed limit on the number of members in a single struct too...
0
 
LVL 10

Accepted Solution

by:
RONSLOW earned 10 total points
ID: 2706049
It is implementation dependant.

It depends on the size of the args being passed etc.

Genreally, if there is a LOT of individual items to be passed, you are better putting them into a struct and passing that instead (preferably by (const) reference)

That way, you have a lot of data, but only one parameter.

Lots of parameters is a BAD idea.  At least with a struct there is some naming (ie each item in the struct has a name) parameters are purely positional.

A neat 'trick' is to use member functions and operator() to do something a bit like named parameters (where order doesn't matter).

struct Function {
  void operator() {
   ... do the work here ..
  }
  F& Name(char* name) { m_name = name; return *this; }
  F& Age(int age) { m_age = age; }
  ... etc
};

call it like this

Function().Name("Roger")..etc...Age(39)();

0

Featured Post

Optimizing Cloud Backup for Low Bandwidth

With cloud storage prices going down a growing number of SMBs start to use it for backup storage. Unfortunately, business data volume rarely fits the average Internet speed. This article provides an overview of main Internet speed challenges and reveals backup best practices.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Article by: SunnyDark
This article's goal is to present you with an easy to use XML wrapper for C++ and also present some interesting techniques that you might use with MS C++. The reason I built this class is to ease the pain of using XML files with C++, since there is…
Container Orchestration platforms empower organizations to scale their apps at an exceptional rate. This is the reason numerous innovation-driven companies are moving apps to an appropriated datacenter wide platform that empowers them to scale at a …
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.

773 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question