c++ - compile error for boost::date_time::days_until_weekday -

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i'm toying around boost::date_time. while doing so, came upon days_until_weekday (documentation link) function appears highly useful me. unfortunately, compile time error following snippet

date f(date d){     return next_weekday(d,  boost::date_time::weekdays::friday); }

reading

> in file included > /usr/include/boost/date_time/gregorian/gregorian_types.hpp:25:0, >                  /usr/include/boost/date_time/posix_time/posix_time_config.hpp:18, >                  /usr/include/boost/date_time/posix_time/posix_time_system.hpp:13, >                  /usr/include/boost/date_time/posix_time/ptime.hpp:12, >                  /usr/include/boost/date_time/posix_time/posix_time.hpp:15, >                  prog.cpp:3: /usr/include/boost/date_time/date_generators.hpp: in instantiation of > 'typename date_type::duration_type > boost::date_time::days_until_weekday(const date_type&, const > weekday_type&) [with date_type = boost::gregorian::date; weekday_type > = boost::date_time::weekdays; typename date_type::duration_type = boost::gregorian::date_duration]': > /usr/include/boost/date_time/date_generators.hpp:488:34:   required > 'date_type boost::date_time::next_weekday(const date_type&, const > weekday_type&) [with date_type = boost::gregorian::date; weekday_type > = boost::date_time::weekdays]' prog.cpp:11:67:   required here /usr/include/boost/date_time/date_generators.hpp:452:37: error: > request member 'as_number' in 'wd', of non-class type > 'const boost::date_time::weekdays' >      duration_type dd(wd.as_number() - d.day_of_week().as_number());

go here paste of code.

as snippet causing error short, i'm out of ideas fix this.

by way, i'm on boost 1.60.0 using clang 3.7.0.

you need convert date_time enum object matches interface expected weekday_type passed function. use greg_weekday function you, eg:

    return next_weekday(d, boost::gregorian::greg_weekday(boost::date_time::friday));

that compiles me under vs2015 , boost 1.53.

a link documentation function: greg_weekday


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