#include <boost/spirit/include/phoenix1.hpp> requires #include <complex> starting from boost 1.65.0

[anonymous]

Compiling

#include <boost/spirit/include/phoenix1.hpp>

int main()
{
    return 0;
}

with

$ g++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.65.1/gcc-7.2.0/include -std=gnu++14

results in

In file included from /opt/wandbox/boost-1.65.0/gcc-7.2.0/include/boost/spirit/home/classic/phoenix.hpp:18:0,
                 from /opt/wandbox/boost-1.65.0/gcc-7.2.0/include/boost/spirit/include/phoenix1.hpp:11,
                 from prog.cc:1:
/opt/wandbox/boost-1.65.0/gcc-7.2.0/include/boost/spirit/home/classic/phoenix/special_ops.hpp:62:48: error: 'complex' is not a member of 'std'
 template <typename T> struct rank<PHOENIX_STD::complex<T> >
                                                ^~~~~~~
/opt/wandbox/boost-1.65.0/gcc-7.2.0/include/boost/spirit/home/classic/phoenix/special_ops.hpp:62:48: error: 'complex' is not a member of 'std'
/opt/wandbox/boost-1.65.0/gcc-7.2.0/include/boost/spirit/home/classic/phoenix/special_ops.hpp:62:57: error: template argument 1 is invalid
 template <typename T> struct rank<PHOENIX_STD::complex<T> >
                                                         ^
/opt/wandbox/boost-1.65.0/gcc-7.2.0/include/boost/spirit/home/classic/phoenix/special_ops.hpp:62:59: error: expected unqualified-id before '>' token
 template <typename T> struct rank<PHOENIX_STD::complex<T> >
                                                           ^

Workaround to the problem is to #include <complex> before phoenix1.hpp but this should be probably done internally.

On boost versions prior to 1.65.0 original code would compile w/o any errors (checked on wandbox.org).

[Nikita Kniazev <nok.raven@…>]

Fixed in ​https://github.com/boostorg/spirit/pull/273