Re: [boost] Futures

On 14 Jan 2015 at 15:48, Rob Stewart wrote:

On January 14, 2015 7:20:43 AM EST, Niall Douglas wrote:

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On 13 Jan 2015 at 16:52, Thomas Heller wrote:

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We keep trivialising C compatibility, and we should not.

No one is trivialising C compatibility. You can call any C code from C++.

I think I was clear that I meant the other way round. C code needing to compose waiting on C++ code to do something with other operations is a major pain. Ask anyone working in the Python C runtime and trying to work with C++ code.

FWIW, that wasn't clear to me before now.

Oh. Okay. Sorry then. To be honest, C code only needs the ability to compose waits, that's the frustrating part because C++ is all up itself with no regard to others. For example, if a promise-future could toggle the signalled state of a file descriptor, that would enable C code to run a select() composure where the C code waits on "something to happen", which includes a C++ future becoming set. FYI the pthreads permit object I wrote has the optional facility to signal a fd when it goes signalled, so a permit object based future would be very useful to C code. Niall -- ned Productions Limited Consulting http://www.nedproductions.biz/ http://ie.linkedin.com/in/nialldouglas/