[Boost-users] boost::future and when_all => compile error "call to deleted constructor"

Subject: [Boost-users] boost::future and when_all => compile error "call to deleted constructor"
From: Tobias Oberstein (tobias.oberstein_at_[hidden])
Date: 2014-03-26 09:48:23

Hello,

I am trying to use boost::future with continuations, in particular 
when_all/when_any.

I am using Boost trunk from GitHub (since only that has when_all etc).

This is what I want to compile:

===

#include <iostream>

#define BOOST_THREAD_PROVIDES_FUTURE
#define BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION
#define BOOST_THREAD_PROVIDES_FUTURE_WHEN_ALL_WHEN_ANY
#include <boost/thread/future.hpp>

using namespace boost;

int main() {
future<int> f1 = async([]() { return 1; });
future<int> f2 = async([]() { return 2; });

auto f3 = when_all(f1, f2);

f3.then([](decltype(f3)) {
std::cout << "done" << std::endl;
});

f3.get();
}

===

https://gist.github.com/oberstet/9783359

This bails out with

/usr/include/c++/v1/memory:1685:31: error: call to deleted constructor 
of 'boost::future<int>'

https://gist.github.com/oberstet/9783364

Am I doing it wrong?

Thanks!
/Tobias