Just out of couriosity i made a benchmark test between C and C++ with gcc3. I dont have a clue abour x86 assembler so i made a measurement. Here is the C code (not realy useful as real code would have a need for a struct and a pointer operation to call the filter() function) and the C++ code. Both "simulate" a low pass filter and are compiled with: gcc -O2 -march=pentium -o filter filter.xx -O3 with C is broken, i got an endless loop! --------- double x1,y1,a,b; const double filter(const double x) { register double y; y = a*(x + x1) - b*y1; x1 = x; y1 = y; return y; } int main() { double x=1; int i; x1 = y1 = 0; a = b = 0.5; for (i=0; i<1000000000; ++i) { x = filter(x); } } --------- class LowPass { public: LowPass() { x1 = y1 = 0; a = b = 0.5; }; ~LowPass() {}; const double filter(const double x); private: double x1,y1,a,b; }; inline const double LowPass::filter(const double x) { register double y; y = a*(x + x1) - b*y1; x1 = x; y1 = y; return y; } int main() { //LowPass* LP = new LowPass(); LowPass LP; double x=1; for (int i=0; i<1000000000; ++i) { //x = LP->filter(x); x = LP.filter(x); } } --------- The results on my AthlonXP machine are: C++ with member: real 0m11.847s user 0m11.850s sys 0m0.000s C++ with new() and pointer: real 0m12.337s user 0m12.330s sys 0m0.000s C: real 0m16.673s user 0m16.670s sys 0m0.000s Well, i will stay with pointer less C++ :-) - Stefan _________________________________________________________________ Surf the Web without missing calls! Get MSN Broadband. http://resourcecenter.msn.com/access/plans/freeactivation.asp