Re: [Boost-users] Passing io_service to socket in implementation file after initialization in header file

Subject: Re: [Boost-users] Passing io_service to socket in implementation file after initialization in header file
From: William Jagels (william_at_[hidden])
Date: 2018-06-18 19:07:19

On Mon, Jun 18, 2018, 14:53 james via Boost-users <
boost-users_at_[hidden]> wrote:

> You want one io_service per endpoint, not per application.
>
I think you're confusing io_service with strands. One io_service/context
should be able to handle multiple endpoints and even multiple threads
running the same io service.

>
> On Monday, June 18, 2018, Richard Hodges via Boost-users <
> boost-users_at_[hidden]> wrote:
>
>> A note of caution.
>>
>> In all but the most exceptional of cases, you will want one io_service
>> per application.
>>
>> Rather than tie the entire application to one instance of a class, which
>> might make testing difficult, you may want to consider providing the
>> io_service to the Foo as a dependency injection, with its lifetime
>> controlled by main().
>>
>> Example (including the fixed constructor):
>>
>> #include <boost/asio.hpp>
>>
>> class foo
>> {
>> public:
>>
>>     foo(boost::asio::io_service& ios); // Constructor.
>>
>> private:
>>
>>     boost::asio::io_service& ios;
>>
>>     boost::asio::ip::udp::socket sock;
>> };
>>
>> foo::foo(boost::asio::io_service& ios)
>> : ios(ios)
>> , sock(ios)
>> {
>> }
>>
>>
>> int main()
>> {
>>     boost::asio::io_service myios;
>>
>>     foo f1(myios);  // note - io_service is injected
>>     foo f2(myios);
>>
>>     //... generate events etc
>>
>>     myios.run();
>>
>>     // now destroy foos and lastly, myios
>> }
>>
>>
>> On Mon, 18 Jun 2018 at 15:46, Vinnie Falco via Boost-users <
>> boost-users_at_[hidden]> wrote:
>>
>>> On Mon, Jun 18, 2018 at 6:13 AM Álvaro Cebrián Juan via Boost-users
>>> <boost-users_at_[hidden]> wrote:
>>> > Why doing sock(ios); doesn't work?
>>>
>>> What is the complete error message from the compiler?
>>>
>>> Thanks
>>> _______________________________________________
>>> Boost-users mailing list
>>> Boost-users_at_[hidden]
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>>>
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