srini4vasan@gmail.com wrote in news:1187957256.897960.56060
@e9g2000prf.googlegroups.com:

Hi,
Is that possible to return two values from a functions at a time.

ie.,Can a function return two values at a time.

if()
{
return
}
else
{
return
}
} // Not like this.

Anything apart from this.

Thanks,

Sure, there are lot's of ways. What do you have in mind? One way is to
define a structure:

struct ReturnValue {
int value1;
int value2;
};

ReturnValue f()
{
ReturnValue f;
f.value1 = 5;
f.value2 = 6;
return f;
}

A more general approach might be to use std::pair<>

std::pair<int,int> f()
{
return std::make_pair(5,6);
}

If you have access to TR1 or boost, you can use tuples. Tuples are cool
because you can also use ties


boost::tuple<int, int> f ()
{
return boost::make_tuple(5,6);
}

The cool thing here is that you can also do:

int a,b;

boost::tie(a,b) = f();

Now 'a' has the value 5 and b the value 6. This is also available int
TR1, I believe.

As you can see, there are lots of choices. Which you choose depends
upon what you are doing and what you have available.

srini4va...@gmail.com wrote:

Is that possible to return two values from a functions at a time.

Absolutely, yes.

For example, the following OCaml function returns x and x^2:

let f x = x, x*x

This may be written in C++ as:

int f(int x) {
return std::pair<int, int>(x, x*x);
}

This style of programming is very fast in modern languages like OCaml but
incurs a significant overhead in languages like C++.