> In pseudo code it should look like this:
> Expressions< N > expressions;
> construct( expressions );    // or something similar
> do_step( epxressions , x ); // my method

How about something like?


#include <boost/proto/proto.hpp>

using namespace boost::proto;

template<class Expr, class X>
void my_method(Expr const& e, X const& x)

int main()
    using namespace boost::proto;

    terminal<int>::type i = {0};
    my_method( (i+i, i*i, i*i*i), 10);


Notice that you don't need to explicitly store the expressions in a container, 
you can just combine them in a larger expression tree which can be parsed in 


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