Can make_ready_future() be extended to also take care for setting an exception in an easy way, e.g.:

template<typename RETURN>
std::future<RETURN> make_ready_future(std::exception_ptr ex) { ... }

or

template<typename RETURN, typename CLOSURE>
std::future<RETURN> make_reday_future(CLOSURE closure) {
    std::promise<RETURN> p = ...;
    std::future<RETURN> f = ...;
    try { p.set_value(closure()); }
    catch(...) { p.set_exception(std::current_exception()); }
    return f;
}

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On Mon, Mar 25, 2013 at 4:22 PM,  <kosta-chrome@ks-baumann.de> wrote:
> Can make_ready_future() be extended to also take care for setting an exception in an easy way, e.g.:
>
> template<typename RETURN>
> std::future<RETURN> make_ready_future(std::exception_ptr ex) { ... }
>
> or
>
> template<typename RETURN, typename CLOSURE>
> std::future<RETURN> make_reday_future(CLOSURE closure) {
>     std::promise<RETURN> p = ...;
>     std::future<RETURN> f = ...;
>     try { p.set_value(closure()); }
>     catch(...) { p.set_exception(std::current_exception()); }
>     return f;
> }
>
> --

You need to be careful - what if the RETURN type is
std::exception_ptr?  Or RETURN type == CLOSURE type.

You probably need different function names or something to
disambiguate from the 'normal' make_ready_future.

make_exceptional_future()?  Who wouldn't want an exceptional future?

Tony

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