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
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
#include
#include
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
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