Dear All
Hi

I usually use the following function for built-in types to std::string
conversion:
// convert a type (typically built-in type) to std::string
template
inline std::string ToStdStr(const T& t)
{
std::istringstream s;
s << t;
return s.str();
}

This actually compiles and works but it doesn't seem like the best
code, so I was wondering is there another way to do this?

[CODE]
template vector* addDepth(T)
{
return new vector;
}

...a templated meth...
{
//Create multi-depth vector based on length
void* vec;
int length = getLength( obj );
for ( int i = 0; i < length; i++ )
{
vec = addDepth( someValue );
}

vector* b = ( vector* ) vec;
}

[/CODE]

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I have 2 classes,

class base {
public:
some virtual functions

}

class derived : public base {
public:
derived(base* b);

}

is there a simpler way to turn a base object into derived than the
following

base* b = new base();

b->do some stuff

now he becomes derived

base* d = new derived(b);

thx

I am using a small set of functions that implements an n-ary tree. The
library is disscusses here:

http://groups.google.com/group/comp.lang.c++/browse_thread/thread/35450795fb41b047/8d274ef3f22fdb90...#8d274ef3f22fdb90

The nodes of the tree are cretaed and erased by new and delete. I just
read in Modern C++ Design that new/delete can be very inefficient. I
am using this library to search in game trees so I do create and erase
a lot of nodes. Would I be better of by creating a large vector
containing nodes and use this vector to store my tree nodes. Instead
of pointers I could use indices. The unused nodes would be linked
together for easy access and used only when a new node is needed. This
would avoid the use of new/delete. The only drawback is that the
memory is allocated even when it's not used, but this is not really an
issue for my application.

Should I expect a significant gain in performance from this?

Let me start by saying that this is more a question about principle
than practice - with the speed of today's computers it's probably
rarely an actual issue. Still I'd like to know...

If I have a function that is called thousands of times per second, it
seems to me that, performance-wise, it would be best to make all
variables used in it global, so that memory for them doesn't have to
be allocated and released with each call. However, I know this
clutters up the name space and can make the code more bug-prone.

Would it ever make sense to use global variables over local ones in
this situation? Would the same answer apply to threads instead of
functions? Thanks for satisfying my curiosity!

[CODE]
(I am not the one who defined these classes)

class _jobject {};
class _jarray : public _jobject {};

typedef _jobject* jobject;
typedef _jarray jarray;

int main()
{
jobject * a;
jarray b;
a = dynamic_cast (&b);
....
}
[/CODE]

This doesn't work and the problem is the only type names I'm
guaranteed to have are jobject and jarray. The original _jobject is
how it's defined here but I'm not guaranteed it''ll always be that way
so I have to work with jobject/jarray.

How would I cast between jobject and jarray?

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