Re: [Boost-users] [lambda] helping lambda to deduce return type and then avoid 'ret<T>'

and indeed for even very simple arithmetic user-defined classes (for example boost.units quantities) the lambda expression is poluted with many many ret<T> statements, for example

_1*_1/(_1+x)/(_1-x)

becomes

ret<anothertype>(ret<usertype>(_1*_1)/ ret<othertype>(ret<usertype>(_1+x)/ret<usertype>(_1-x)));

the question is, is there a way to help lambda library to help deducing the return type to avoid the repeated use of ret<T>.

You should take a look at <boost/units/lambda.hpp> - Torsten Maehne contributed it to deal with interplay between lambda and units... Something similar might be worthwhile with interval as well. Matthias