On Aug 30, 2005, at 7:25 AM, Pierre viallet wrote:


<excerpt><fixed><fontfamily><param>Courier New</param>I’m just
starting to use boost::lambda an boost::lambda::bind, and I do not
understand why this do not work whith valarray :</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param> </fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param> </fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>namespace std{</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param> </fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>class CToto{</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>public:</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>      CToto(double _i):
a(_i) {}</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>      CToto(): a(0.0) {}</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>      double get() const</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>            {return a;}</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>private:</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>       double a;</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>};</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param> </fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param> </fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>std::vector<<std::CToto
*> aTotoPtrVect;</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>aTotoPtrVect.push_back(new
std::CToto(1.1));</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>aTotoPtrVect.push_back(new
std::CToto(2.2));</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>aTotoPtrVect.push_back(new
std::CToto(3.3));</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>aTotoPtrVect.push_back(new
std::CToto(4.4));</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param> </fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>std::vector <<double>
dv(std::distance((aTotoVect.begin(), aTotoVect.end());</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>std::for_each(aTotoPtrVect.begin(),
aTotoPtrVect.end(), bll::var(dv)[bll::var(uiIdx)++] =
bll::bind(&std::CToto::get, bll::_1)); // work fine</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param> </fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>std::valaray <<double>
dvv(std::distance((aTotoVect.begin(), aTotoVect.end());</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param>std::for_each(aTotoPtrVect.begin(),
aTotoPtrVect.end(), bll::var(dvv)[bll::var(uiIdx)++] =
bll::bind(&std::CToto::get, bll::_1)); // do not work</fontfamily></fixed>

<fixed><fontfamily><param>Courier New</param> </fontfamily></fixed>

</excerpt>

Probably, because BLL does not know about valarray, and doesn't know
what the return type of [] should be.

I haven't tested this, but you can try wrapping
<fixed><fontfamily><param>Courier New</param><smaller>bll::var(dvv)[bll::var(uiIdx)++]

</smaller></fontfamily></fixed>

with bll::ret as follows :

<fixed><fontfamily><param>Courier New</param><smaller><smaller>

</smaller></smaller>bll::ret<<double&>(bll::var(dvv)[bll::var(uiIdx)++])


Best, Jaakko Järvi

</fontfamily></fixed>



<excerpt><fixed><fontfamily><param>Courier New</param>Is someone could
explain me that ?</fontfamily></fixed>


 


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