[Boost-users] Help with a boost::lambda problem and boost::array?

Subject: [Boost-users] Help with a boost::lambda problem and boost::array?
From: jesseperla_at_[hidden]
Date: 2009-01-22 12:37:21

> Is there a solution?

It appeared to me that the likely winner was:  
http://www.boost.org/doc/libs/1_37_0/doc/html/lambda/extending.html

Then it seems we would use the boost array's typedef value_type to get the  
return type. However, I do not see operator[] overloading in the list of  
supporting operators here.

But the following code compiles:
//Testing lambda and vectors/arrays.
using lambda::_1;
std::vector<Real> vec(1);
vec[1] = 0;
boost::function<Real (std::vector<Real>)> vec_f = _1[0]; //Returns the 0'th  
element.

Hence, it seems that this type of action is supported. Any idea where the  
sourcecode for the std::vector lambda operators are? might be useful to  
just copy/paste.

Also, I wonder if there is any way to do this generically for all  
vector/array types supporting the Container concept? (I use a lot of  
ublas::vectors). And if operator() is also supported, I use a lot of  
ublas::matrix as well, so this would be nice to have in lambda.

Jesse