AMDG Kraus Philipp wrote:
I have a problem with the boost libs (1.42). Your code compiles without errors, but in the "operator_lambda_func_base.hpp" at line 135 the compilere shows the error 4 times: conversion from 'double' to non-scalar type 'boost::lambda::detail::unspecified' requested <snip> Can you please help to solve this problem?
Obviously I should have tried to compile before posting... Apparently Lambda doesn't work with uBLAS by default. #include <boost/iterator/counting_iterator.hpp> #include <boost/iterator/permutation_iterator.hpp> #include <boost/lambda/lambda.hpp> #include <boost/numeric/ublas/vector.hpp> #include <algorithm> #include <iostream> namespace ublas = boost::numeric::ublas; namespace boost { namespace lambda { template<class T, class Allocator, class B> struct plain_return_type_2<other_action<subscript_action>, ublas::vector<T, Allocator>, B> { typedef typename ublas::vector<T, Allocator>::reference type; }; } } int main() { ublas::vector<long double> vec(5); vec[0] = 2.0; vec[1] = 1.0; vec[2] = 3.0; vec[3] = 5.0; vec[4] = 4.0; using namespace boost::lambda; std::vector<std::size_t> temp(boost::counting_iterator<std::size_t>(0), boost::counting_iterator<std::size_t>(vec.size())); std::sort(temp.begin(), temp.end(), var(vec)[_1] < var(vec)[_2]); std::vector<std::size_t> ranking(temp.size()); std::copy(boost::counting_iterator<std::size_t>(0), boost::counting_iterator<std::size_t>(vec.size()), boost::make_permutation_iterator(ranking.begin(), temp.begin())); std::copy(ranking.begin(), ranking.end(), std::ostream_iterator<std::size_t>(std::cout, " ")); } In Christ, Steven Watanabe