On 15 June 2017 at 12:10, Klaim - Joël Lamotte <mjklaim@gmail.com> wrote:

On Wed, Jun 14, 2017 at 1:35 AM, dinesh kumar <dineshkumar02@gmail.com> wrote:

Hi Team,

Greetings for the day.

I am currently facing the problem with process extension as documented here.

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

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