Hi Team,

Would anyone share your suggestions about the following error?

*Error: *

/usr/local/include/boost/process/detail/handler.hpp:33:9: No matching function for call to object of type 'std::__1::function'

On Wed, Jun 14, 2017 at 1:35 AM, dinesh kumar 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#boos... . 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 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'

Would somebody guide me here, please?

The documentation[1] states: "The required signature is void(Exec &), where Exec is a template

On 15 June 2017 at 10:55, dinesh kumar via Boost-users < boost-users@lists.boost.org> wrote: 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.... Joël Lamotte

Hi Joël Lamotte, Thank you very much for pointing me in the right direction, and I still see that the documentation here http://www.boost.org/doc/libs/1_64_0/doc/html/boost_process/design.html#boos... needs better improvement and I will try to raise a request to improve the docs. --Dinesh On Thu, Jun 15, 2017 at 3:44 PM, Klaim - Joël Lamotte via Boost-users < boost-users@lists.boost.org> wrote:

On 15 June 2017 at 12:10, Klaim - Joël Lamotte wrote:

...

...

On Wed, Jun 14, 2017 at 1:35 AM, dinesh kumar 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#boos... . 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 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'

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/pro cess/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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-- Regards, Dinesh manojadinesh.blogspot.com