2011/10/19 Arash Partow <arash@partow.net>

Marcello Puligheddu wrote:
> In
> http://www.boost.org/doc/libs/1_47_0/doc/html/thread/thread_management.html
>
> Thread Constructor with arguments

> <http://www.boost.org/doc/libs/1_47_0/doc/html/thread/thread_management.html#thread.thread_management.thread.multiple_argument_constructor>

>
> [...]
> Note:
>
> Currently up to nine additional arguments |a1|to |a9|can be
> specified in addition to the function |f|.
>
> But in
>
> Launching threads

> <http://www.boost.org/doc/libs/1_47_0/doc/html/thread/thread_management.html#thread.thread_management.launching_threads>

>
> is clearly stated
>
> "There is an unspecified limit on the number of additional arguments
> that can be passed."

AFAIK, for C++11 implementations of std::thread, based on 30.2.1.2 of [1], the constructor is to make use of variadic templates. I believe that is where the term "unspecified" originates. For pre C++11 implementations, this can only be achieved through multiple overloads with a varying number of parameters, which would inevitably have a trivial upper-limit.

[1] http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2497.html#thread.threads.constr

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--
marcello puligheddu
Cagliari ,Sardegna, Italia
+393203090251