Re: [Boost-users] Process extension compile issue.

Subject: Re: [Boost-users] Process extension compile issue.
From: Klaim - Joël Lamotte (mjklaim_at_[hidden])
Date: 2017-06-15 10:14:12

On 15 June 2017 at 12:10, Klaim - Joël Lamotte <mjklaim_at_[hidden]> wrote:

>
>> On Wed, Jun 14, 2017 at 1:35 AM, dinesh kumar <dineshkumar02_at_[hidden]>
>> wrote:
>>
>>> Hi Team,
>>>
>>> Greetings for the day.
>>>
>>> I am currently facing the problem with process extension as documented
>>> here
>>> <http://www.boost.org/doc/libs/1_64_0/doc/html/boost_process/design.html#boost_process.design.plat_ext>
>>> .
>>> I am testing the boost 1.64 version macOS, and unable to use the below
>>> functionality.
>>>
>>> void test() {
>>>
>>>     cout << "On Setup" << endl;
>>>
>>> }
>>>
>>> int main() {
>>>
>>> std::function<void(void)> on_st = test;
>>>
>>> bp::child c2("ls", boost::process::extend::on_setup(on_st));
>>>
>>> }
>>>
>>> *Error: *
>>>
>>> /usr/local/include/boost/process/detail/handler.hpp:33:9: No matching
>>> function for call to object of type 'std::__1::function<void ()>'
>>>
>>> Would somebody guide me here, please?
>>>
>>>
> The  documentation[1] states:
> "The required signature is void(Exec &), where Exec is a template
> parameter".
>
> on_st's type do not match this requirement.
>
> [1]: http://www.boost.org/doc/libs/1_64_0/doc/html/boost/
> process/extend/on_setup.html
>

The following change should work (I didn't try but the documentation have a
similar exemple there:
http://www.boost.org/doc/libs/1_64_0/doc/html/boost_process/extend.html#boost_process.extend.error

void test() {

    cout << "On Setup" << endl;

}

int main() {

auto on_st = [](auto exec){ test(); };

bp::child c2("ls", on_setup(on_st));

}

Joël Lamotte