Michael Maged

[Kevlin Henney]

In message <41603C42.20801 at metalanguage.com>, Andrei Alexandrescu 
<andrei at metalanguage.com> writes
>
>> Good question. The dead minimum for (1) seems to be to define a Thread
>> class, with ways to create, start, block, unblock, block-with-timeout,
>> detect termination, and query status. You could then in principle
>> build everything in (2), not that most people would want to --
>> existing stuff must be able to comply.  Can this be done in a way that
>> everyone is guaranteed to love, or at least tolerate?
>
>I believe so. The way that I think would be most natural to the C++ 
>community would be to have a start_thread template function that takes 
>a  generic functor and returns a Thread object. The Thread object ought 
>to be parameterized by the type returned by the functor. This way users 
>can call query_result(). Here's a sketch:
>
>template <class Result>
>class thread {
>  ...
>public:
>  void block();
>  void block(unsigned int timeout);
>  void unblock();
>  Result query_result();
>  Result force_result();
>  ...
>};
>
>template <class Result, class Fun>
>thread<Result> start_thread(Fun fun) {
>  ...
>}
>
>A note - there are facilities in C++'s current standard library that 
>allow you to pack a pointer to object and a pointer to member function 
>in one functor. So starting a thread via a functor works with simple 
>functions as well as with member functions.

My inclination is towards a slightly more decoupled model, taking the 
function metaphor further. See attached PDF as an example.

Kevlin

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