matrix types

Many thanks for the mtl library.
The performance graphs are really impressive.

Here is my problem:
I would like to choose an upper triangular matrix type
which is a template with arbitrary element type
parameter T, something like

template<class T>
typedef matrix < T, 
                 triangle,
                 banded<>,
                 column_major >::type UTMatrix;

and then

int n=20;
UTMatrix A(n,n);

I am sorry I have to ask this question before
experimenting with the compiler but it's so basic for
my application I can't use the mtl if I cannot do this
so I have no code written up yet.

Mostly I have to allocate matrices of a size which is
not known at compile time. Can I still expect benefits
from the mtl template techniques or would I get
similar performance by hand coding straightforward
loops?

Here is another question: I am using the GNU g++
compiler which does not optimize small objects (the
mayflies). Is this going to lead to serious
performance degradation (below straightforward
handcoded loops)?

Many thanks,

Mike
                
                 




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