Workaround for g++ problem compiling Boost.Asio examples on Ubuntu 8.04.3
I'm running Ubuntu 8.04.3 as a VMware virtual machine hosted by Windows XP on a Lenovo T61 laptop. Synaptic Package Manager [or apt-get] on Ubuntu 8.04.3 offers both the libboost-dev v1.34.1 and the libasio-dev v0.3.8 packages with pre-built libraries. Version 1.34 of Boost does not have an integrated asio library; asio integration appears in v1.35 and later versions of Boost. Source code for the problematic example program can be found here: http://www.boost.org/doc/libs/1_41_0/doc/html/boost_asio/tutorial/tuttimer4/... Source listing for Timer.4 The first compile problem occurs at the second #include: #include <boost/asio.hpp> The compiler cannot find this header because asio.hpp was installed under /usr/include rather than under /usr/include/boost. I fixed this issue by creating a soft link to /usr/include/asio.hpp in /usr/include/boost: $ sudo ln -s ../asio.hpp /usr/include/boost/asio.hpp Solving the second compile problem proved more difficult. The second compile problem occurred at the first use of the boost::asio namespace: printer(boost::asio::io_service& io) Changing all occurrences of 'boost::asio' to simply 'asio' solves this problem, but makes tedium of playing with the examples and developing new code that will be compatible with v1.35+ of Boost. Instead, I employed namespace declarations to (artificially) nest the asio namespace within the boost namespace. This artificial nesting is straight-forward - a single line of code: #include <iostream> #include <boost/asio.hpp> #include <boost/bind.hpp> #include <boost/date_time/posix_time/posix_time.hpp> namespace boost { namespace asio { using namespace ::asio; } } class printer { public: printer(boost::asio::io_service& io) o o o Caution: I have not made exhaustive tests of this workaround, but it does compile [g++ 4.2.4] , link, and run on my platform: $ g++ -o timer timer.cpp -lboost_thread $ ./timer 0 1 2 3 4 Final count is 5 You may find more helpful information here, from the developer of the asio library: http://blog.think-async.com/ http://blog.think-async.com -- View this message in context: http://old.nabble.com/Workaround-for-g%2B%2B-problem-compiling-Boost.Asio-ex... Sent from the Boost - Users mailing list archive at Nabble.com.
That is a very old version of boost. I just just download the source and build and install the latest version. If you do this, a lot of your problems will disappear. Andrew On Thu, Dec 10, 2009 at 2:35 PM, David Featherstone <dfeathers@omnitrol.com> wrote:
I'm running Ubuntu 8.04.3 as a VMware virtual machine hosted by Windows XP on a Lenovo T61 laptop.
Synaptic Package Manager [or apt-get] on Ubuntu 8.04.3 offers both the libboost-dev v1.34.1 and the libasio-dev v0.3.8 packages with pre-built libraries. Version 1.34 of Boost does not have an integrated asio library; asio integration appears in v1.35 and later versions of Boost.
Source code for the problematic example program can be found here: http://www.boost.org/doc/libs/1_41_0/doc/html/boost_asio/tutorial/tuttimer4/... Source listing for Timer.4
The first compile problem occurs at the second #include:
#include <boost/asio.hpp>
The compiler cannot find this header because asio.hpp was installed under /usr/include rather than under /usr/include/boost. I fixed this issue by creating a soft link to /usr/include/asio.hpp in /usr/include/boost:
$ sudo ln -s ../asio.hpp /usr/include/boost/asio.hpp
Solving the second compile problem proved more difficult. The second compile problem occurred at the first use of the boost::asio namespace:
printer(boost::asio::io_service& io)
Changing all occurrences of 'boost::asio' to simply 'asio' solves this problem, but makes tedium of playing with the examples and developing new code that will be compatible with v1.35+ of Boost. Instead, I employed namespace declarations to (artificially) nest the asio namespace within the boost namespace. This artificial nesting is straight-forward - a single line of code:
#include <iostream> #include <boost/asio.hpp> #include <boost/bind.hpp> #include <boost/date_time/posix_time/posix_time.hpp>
namespace boost { namespace asio { using namespace ::asio; } }
class printer { public: printer(boost::asio::io_service& io) o o o
Caution: I have not made exhaustive tests of this workaround, but it does compile [g++ 4.2.4] , link, and run on my platform:
$ g++ -o timer timer.cpp -lboost_thread $ ./timer 0 1 2 3 4 Final count is 5
You may find more helpful information here, from the developer of the asio library: http://blog.think-async.com/ http://blog.think-async.com -- View this message in context: http://old.nabble.com/Workaround-for-g%2B%2B-problem-compiling-Boost.Asio-ex... Sent from the Boost - Users mailing list archive at Nabble.com.
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-- ___________________________________________ Andrew J. P. Maclean Centre for Autonomous Systems The Rose Street Building J04 The University of Sydney 2006 NSW AUSTRALIA Ph: +61 2 9351 3283 Fax: +61 2 9351 7474 URL: http://www.acfr.usyd.edu.au/ ___________________________________________
No doubt there are numerous solutions to this problem. My intent was to give exposure to the technique of artificially nesting one namespace within another, which I think could have wider applicability. ... Dave Andrew Maclean-2 wrote:
That is a very old version of boost. I just just download the source and build and install the latest version. If you do this, a lot of your problems will disappear.
Andrew
-- View this message in context: http://old.nabble.com/-ASIO--Workaround-for-problem-compiling-Boost.Asio-exa... Sent from the Boost - Users mailing list archive at Nabble.com.
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