c++ - How to make io_service.run(); blocking -

i have method need io_service.run(); block method returning while actual rest call not yet done. added "init" value response body check.

restclient::response restclient::get(std::string url){     restclient::response ret = {};     ret.code = 404;     ret.body = "init";     boost::asio::ssl::context ctx(boost::asio::ssl::context::sslv23);     ctx.set_verify_mode(boost::asio::ssl::verify_none);     //ctx.set_default_verify_paths();     boost::asio::io_service io_service;     client c(io_service, ctx, "httpbin.org", "/get", "https", ret);     io_service.run();     return ret; // res.body returned init } 

in way io_service.run() block method returning until call finished or timed-out?

if want run() keep running when there no "work", can lock service queue using boost::asio::io_service::work object:

• http://www.boost.org/doc/libs/1_58_0/doc/html/boost_asio/reference/io_service__work.html

the usual pattern use optional<io_service::work> or shared_ptr<io_service::work> can do

_work.reset(); 

when want service return run().