comp.lang.c++ Google Group

Re: Array Value

cplusplusquest...@gmail.com — Wed, 08 Oct 2008 03:44:02 UT

Sorry again. You are right. The declaration should be AClass
aclass(a, b, c).

Re: Array Value

joec...@gmail.com (joseph cook) — Wed, 08 Oct 2008 03:36:13 UT

This compiled?? What compiler? You are declaring two variable 'a' in
the same scope. One is an array, and the other is of type "AClass"
Joe C

Re: Array Value

cplusplusquest...@gmail.com — Wed, 08 Oct 2008 03:12:49 UT

Sorry I didn't finish the edited yet:
I have code in main function:
int main(){
int a[20];
int b[20][20];
for(int i=0; i<20; i++)
a[i]=0;
.......
AClass a(a, b, c);
....
For AClass:
class AClass{
private:
int* a1;
int* b1[20];
int c1;
.....
public:
AClass(int x[], int y[][20], int z);

Array Value

cplusplusquest...@gmail.com — Wed, 08 Oct 2008 03:04:15 UT

I have code in main function:
int main(){
int a[20];
int b[20][20];
for(int i=0; i<20; i++)
a[i]=0;
.......
AClass a(a, b, c);
....
For AClass:
class AClass{
private:
int* a1;
int* b1[20];
.....
public:
AClass(int x[], int y[][20], int z);
AClass::AClass(int x[], int y[][20], int z): a1(x), c1(z){

Re: Noob: What is the error in this code?

joec...@gmail.com (joseph cook) — Wed, 08 Oct 2008 00:20:14 UT

You don't have any include files, and as such, "std::string" is not
defined.
Here is the list of standard C++ headers
[link]
Joe C

Re: Noob: What is the error in this code?

danie...@earthlink.net (Daniel T.) — Tue, 07 Oct 2008 23:21:28 UT

In article
<92e08422-9186-4edd-ac49-5287f bb69...@25g2000prz.googlegroup s.com>,
"ComeauTest.c", line 7: error: name followed by "::" must be a class or
namespace
name... Wild guess: Did you #include the right header?
Position(std::string name, std::string name):
^
"ComeauTest.c", line 7: error: expected a ")"

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notjustsneak...@yahoo.com.cn (www.notjustsneakers.com) — Tue, 07 Oct 2008 22:41:11 UT

pointers for some libraries, numerical(if available)

umut.ta...@gmail.com (utab) — Tue, 07 Oct 2008 22:08:34 UT

Dear all,
I have some Stiffness and Mass matrices written out from Ansys(commercial
Finite Element code) in Harwell Boeing(HB) format. I can read them
through a template library, GMM++. GMM++ can read them in the compressed
column/row formats. My ultimate aim is to use these matrices in some
eigenvalue computations.

Re: To get started with C++

ha...@sbox.tugraz.at (Christian Hackl) — Tue, 07 Oct 2008 21:44:18 UT

sean_in_rale...@yahoo.com ha scritto:
Strange thing that nobody in comp.lang.c++ ever pointed out any such
flaws to me when I posted a question here. Instead, I always received
competent and helpful answers, similar to the ones given to the OP in
this thread.
What's more, thanks to the group's strict on-topic policy it's an

Re: Interfaces in C++

beckmann.m...@googlemail.com (Maik) — Tue, 07 Oct 2008 21:25:49 UT

The C++ interfaces pattern uses the C++ compiler and runtime library
to make a C++ developers life easier.
In case of closed source software an extra C-API might be sufficient
to support a big set of C/C++ compilers in different versions.
Heterogeneous software projects need other tools (SWIG, CORBA,

Re: Interfaces in C++

beckmann.m...@googlemail.com (Maik) — Tue, 07 Oct 2008 20:57:55 UT

Hi! Virtual inheritance has worse performance, thats right. But as
long as an interface lookup at runtime triggers an much bigger chuck
of operations (say matrix operations or stl action) the over all
performance drop is small.
For performance critical parts I would even consider to avoid virtual
member functions. But for interfaces virtual inheritance is most

Re: Why do I need to overload =

v.abaza...@comacast.net (Victor Bazarov) — Tue, 07 Oct 2008 19:56:22 UT

If you're receiving a reference to some temporary object and holding
onto it, that's your problem. Don't do that. When your class has
references as members, you basically go into the *contract* that the
objects to which those members refer live *longer* than the object that
contains those references. If the referred objects have a shorter

Re: Why do I need to overload =

v.abaza...@comacast.net (Victor Bazarov) — Tue, 07 Oct 2008 19:52:13 UT

There is no such thing as a NULL reference. How do you get yours to be
"NULL"? Figure that, fix it, and then everything should be OK.
V

Re: strcmp

nos...@thanks.invalid (Juha Nieminen) — Tue, 07 Oct 2008 19:16:51 UT

Neel wrote:
Exactly how do you expect strlen to be able to calculate the length of
the string if it isn't null-terminated already?