Boost Phoenix compilation error

Question

I was trying using Boost Phoenix. My aim is to have stl algorithms that take a container instead of range of iterators, as described here. However, I am getting a mess of errors on a rather simple code:

#include <boost/phoenix/stl/algorithm.hpp>
#include <iostream>
#include <vector>
#include <algorithm>

namespace phx = boost::phoenix;

int main(int argc, char ** argv) {
    std::vector<int> my_arr{ 0, 1, 2, 3 };
    phx::for_each(my_arr, [](int i){std::cout << i << std::endl; });
}

I tried it on two platforms (Win7, Ubuntu) where I otherwise use multiple parts of Boost.

The error messages are rather long so I put them in files:

• MVC++ November 2013, Boost 1.55

• G++4.7.2, Boost 1.53

I can't really make much of the errors apart from templates not being compiled correctly, but I guess I am missing something rather simple.

Answer 1

I think you are using the wrong boost library. The phoenix algorithms are lazy functions which are explained here. So phoenix::for_each does not do anything if it is called, but returns a function object which iterates over the range once it is called. If you simply want to use the STL (and other) algorithms on ranges you can use the boost.range library:

#include <boost/range/algorithm/for_each.hpp>
#include <iostream>
#include <vector>

namespace rng = boost::range;

int main(int argc, char ** argv) {
    std::vector<int> my_arr{ 0, 1, 2, 3 };
    rng::for_each(my_arr, [](int i){std::cout << i << std::endl; });
}

Answer 2

You simply need to include the phoenix core before including anything else.

#include <boost/phoenix/core.hpp>
#include <boost/phoenix/stl/algorithm.hpp>
... rest of your program