Hi Everyone,

I was wondering about references to functions, so i tried this,

int (& p[10]) (); // doesn't work as array of references is
illegal as memory is not allocated for references,

next, i tried a single reference to the function,

int ( & p ) ();

int incomplete_function(void)
{
// #error *** Nigel - Function incomplete. Fix before using ***
printf("testing testing testing done...\n");
return (0);
}

int sample(void)
{
printf("sample\n");
return(0);
}

I define a class in A.h:

template class A{

public:
void get_elem( const T&) ;
};

Then I give the implementation in A.cpp (and do an explicit
instantiation ):

template void A::get_elem( const T&)
{...}

template class A; //explicit instantiation

I have another two files: main.cpp and B.cpp. I would like to reuse
the explicit instantiation of A of A.cpp in the two files. Do I
need to declare class A in the two files? I am not sure how to do
it?

Any help are appreciated.

Hua

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This define is from the Vista SDK from propidl.h:

#ifdef __cplusplus
#define REFPROPVARIANT const PROPVARIANT &
#else
#define REFPROPVARIANT const PROPVARIANT * __MIDL_CONST
#endif

and again in propkeydef.h:

#ifdef __cplusplus
#define REFPROPERTYKEY const PROPERTYKEY &
#else // !__cplusplus
#define REFPROPERTYKEY const PROPERTYKEY * __MIDL_CONST
#endif // __cplusplus

OK, so I know what PROPVARIANT and PROPERTYKEY are, but I'm afraid
that I don't understand what REFPROPVARIANT and REFPROPERTYKEY refers
to.
What exactly is being defined? How does REFPROPVARIANT and
REFPROPERTYKEY relate to the original PROPVARIANT and PROPERTYKEY,
respectively. I've not seen this same syntax before.

On Mon, 2007-12-31 at 10:46 -0500, Pete Becker wrote:

"Another way" that makes the product cost five times more than the
market will pay for it. If the market wants slightly less confidence for
greatly reduced price a smart programmer, competent or not, gives it to
them. I offer stakeholders the choice, I'll take longer but be damned
sure it's right, or do it quickly with some uncertainty over what
happens in bizarre corner cases.

Hi -

What's the point of having references (&)? Why don't we just use
pointers (*)?

Thanks.

I have two classes , say A and B. A contains methods named f1() ,
f2() and B contains methods named g1(), g2().
f1() will invoke g2() and g1() will invoke f2(). This situation is
kinda like two things interact with each other.
But the program couldn't pass the compliation. g++ says " invalid use
of undefined type of ......" .
As far as I know, forward declaration couldn't solve this problem, and
I have tried. Both of the definition of the two classes has to come
first which is not possible.
This can be solved by redesign A and B, but I wish I can find some
other solutions here, any advice will be welcome .

Best wishes for 2008!

After studying the fine print
for the "Next Big Thing (tm)"
I *still* found no word about
one big issue, the "raw string"
or "verbatim string" etc.

Whats so complicated with this
little detail? After working
a while with the Boost::Regex
(which goes into TR1), I have
to say - it's like to repaper a
room through the keyhole in it's
door - i end up writing and testing
the regular expression in Perl and
converting the result then by doubling
it's length by added backslashes - to
C++ strings.

Hey everyone,

I am new to c++ and the group and would appreciate your help.

I was doing a problem on projecteuler.net in which you had to find the
largest factor of an extremely large number. Unfortunately, I didn't
know how to accommodate a number of this size in c++. After
developing my algorithm and writing it in c++, I wrote the program in
ruby (a bit easier for large numbers) and found the answer. Looking
in the forum at other people's code, I was able to change mine to
work:

#include
#include
using namespace std;

int main() {

long long N=317584931803LL;

for (long long int i=2; i<=sqrt(N); i++) if (!(N%%i)) N/=i;

cout << N;

string wait;

cin >> wait;

Hi,

I'm trying to learn some STL using map or hash_map would maybe even
better to use but I don't really know how to find a specific struct
depending on a DWORD value that is in range of two DWORD values (see
below for more).

So what I trying to achieve is creating a look up table of a IP adress
with a start adress (a DWORD value) and a end adress (a DWORD
value) which I would like to look up to the get the Country name
using a specific IP adress (also in DWORD) which is random access to
the table.

It is easy to use vector, linked list but I would like to try to use
map or hash map for more effecient way to look up or at least test it
out to compare some.

The code is basicly looks like this: