Databases
StackOverflow2013
Postsdbo
POC++, Linux: error: conversion from ‘boost::unique_future<void>’ to non-scalar type ‘boost::shared_future<void>’ requested. how to get around it?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POC++, Linux: error: conversion from ‘boost::unique_future<void>’ to non-scalar type ‘boost::shared_future<void>’ requested. how to get around it?
    primarykey
    data
    text
    <p>I try to work with <a href="http://www.boost.org/doc/libs/1_47_0/doc/html/thread/synchronization.html#thread.synchronization.futures" rel="nofollow">boost thread futures</a>. So as shown <a href="http://boost.2283326.n4.nabble.com/Reviews-Futures-packaged-task-and-shared-future-td2653185.html" rel="nofollow">here</a> we can get <a href="http://www.boost.org/doc/libs/1_47_0/doc/html/thread/synchronization.html#thread.synchronization.futures.reference.shared_future" rel="nofollow">shared future</a> from <a href="http://www.boost.org/doc/libs/1_47_0/doc/html/thread/synchronization.html#thread.synchronization.futures.reference.packaged_task" rel="nofollow">packaged task</a>.</p> <p>So I try such function on linux:</p> <pre><code>template &lt;class task_return_t&gt; void pool_item( boost::shared_ptr&lt; boost::packaged_task&lt;task_return_t&gt; &gt; pt) { boost::shared_future&lt;task_return_t&gt; fi= pt-&gt;get_future(); // error //... </code></pre> <p>but I get error calling it:</p> <pre><code>../../src/cf-util/thread_pool.h: In member function ‘void thread_pool::pool_item(boost::shared_ptr&lt;boost::packaged_task&lt;R&gt; &gt;) [with task_return_t = void]’: ../../src/cf-util/thread_pool.h:64:3: instantiated from ‘void thread_pool::post(boost::shared_ptr&lt;boost::packaged_task&lt;R&gt; &gt;) [with task_return_t = void]’ ../../src/cf-server/server.cpp:39:27: instantiated from here ../../src/cf-util/thread_pool.h:124:58: error: conversion from ‘boost::unique_future&lt;void&gt;’ to non-scalar type ‘boost::shared_future&lt;void&gt;’ requested </code></pre> <p>I did not take any futures from that task before. <a href="http://code.google.com/p/cloudobserver/source/browse/trunk/CloudServer/" rel="nofollow">all source code</a>, <a href="http://code.google.com/p/cloudobserver/source/browse/trunk/CloudServer/src/cf-server/server.cpp?r=1477" rel="nofollow">place where I do call from</a>, <a href="http://code.google.com/p/cloudobserver/source/browse/trunk/CloudServer/src/cf-util/thread_pool.h?r=1477" rel="nofollow">my thread pool that is being called</a>. And on Windows under Visual Studio 2010 it compiles and works perfectly.</p> <p>What shall I do? how to fix or get around this error?</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USNathan Kleyn
    1. USRella
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POC++, Linux: error: conversion from ‘boost::unique_future<void>’ to non-scalar type ‘boost::shared_future<void>’ requested. how to get around it?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POC++, Linux: error: conversion from ‘boost::unique_future<void>’ to non-scalar type ‘boost::shared_future<void>’ requested. how to get around it?
      1. USbdonlan
      1. VTFavorite
    3. VO
      singulars
      1. POC++, Linux: error: conversion from ‘boost::unique_future<void>’ to non-scalar type ‘boost::shared_future<void>’ requested. how to get around it?
      1. USRella
      1. VTFavorite
    1. COPerhaps a version problem? I can convert a `unique_future` to a `shared_future` just fine on my end.
      singulars
      1. POC++, Linux: error: conversion from ‘boost::unique_future<void>’ to non-scalar type ‘boost::shared_future<void>’ requested. how to get around it?
      1. USLuc Danton
    2. CO@Luc Danton: Show me how and I will try it!) Secondly problem is I pass tasks to my task manager that than sends tham into this function. So problem here is that `unique_future` can be already taken\assigned and be on `.wait();` for example.
      singulars
      1. POC++, Linux: error: conversion from ‘boost::unique_future<void>’ to non-scalar type ‘boost::shared_future<void>’ requested. how to get around it?
      1. USRella
    3. COLike you're attempting: `boost::shared_future<int> f = task.get_future();` where `task` is `boost::packaged_task<int> task;`. (Your second problem sounds like it warrants a separate question.)
      singulars
      1. POC++, Linux: error: conversion from ‘boost::unique_future<void>’ to non-scalar type ‘boost::shared_future<void>’ requested. how to get around it?
      1. USLuc Danton
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload