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POIn the Concurrency Runtime, can I use parallel_invoke or task_group with non-const function objects?
 

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  1. POIn the Concurrency Runtime, can I use parallel_invoke or task_group with non-const function objects?
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    <p>I'm using the Concurrency Runtime with Visual C++ 2010, and am interested in the capabilities of <a href="http://msdn.microsoft.com/en-us/library/dd470426.aspx" rel="nofollow">parallel_invoke</a> and <a href="http://msdn.microsoft.com/en-us/library/dd492427.aspx" rel="nofollow">task_group</a> (parts of the PPL or <a href="http://msdn.microsoft.com/en-us/library/dd492418.aspx" rel="nofollow">Parallel Patterns Library</a>). I'd like to be able to start two parallel actions via function objects (rather than lambda functions or function pointers), but I can't get the code to compile, because of an error:</p> <pre><code>error C3848: expression having type 'const C' would lose some const-volatile qualifiers in order to call 'void C::operator ()(void)' </code></pre> <p>But if I make the C::operator()() const, then I lose a lot of the benefits of a function object, namely, that its state is mutable and maintained internally between calls. Am I missing something here? Is there a way that I could invoke non-const function objects in parallel?</p> <p>BTW, I realize that I could use the <a href="http://msdn.microsoft.com/en-us/library/dd492627.aspx" rel="nofollow">Asynchronous Agents Library</a>, and derive the classes from the Concurrency::agent class, but please consider that beyond the scope of this question (in part due to the lack of exception handling and cancellation options).</p> <p>I'm just interested in what I can do with the PPL, and while there are examples with lambda functions and function pointers, I couldn't find or create any examples with function objects that do more than a parallel "Hello World". I'm looking for something that really takes advantage of function objects, and, if possible, also concurrent containers.</p>
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