Hi everyone, I am a new to boost. When I compile the example of asio_timer, I have a compile error: " g++ -o test_timer test_timer.cpp -I /peter/boost/boost_1_36_0 -lboost_thread-gcc42-mt-1_36 -lboost_system-gcc42-mt-1_36 In file included from /usr/include/c++/4.2/iostream:44, from test_timer.cpp:11: /usr/include/c++/4.2/i486-linux-gnu/bits/c++config.h:149: error: expected constructor, destructor, or type conversion before ‘namespace’ Compilation exited abnormally with code 1 at Tue Oct 28 00:04:58" My compile command is: g++ -o test_timer test_timer.cpp -I /peter/boost/boost_1_36_0 -lboost_thread-gcc42-mt-1_36 -lboost_system-gcc42-mt-1_36 I cannot find the reason. Could you help me? Thanks very much. Best wishes, Wenhao // // time_t_timer.cpp // ~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com) // // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // #include <boost/asio.hpp> #include <ctime> #include <iostream> struct time_t_traits { // The time type. typedef std::time_t time_type; // The duration type. struct duration_type { duration_type() : value(0) {} duration_type(std::time_t v) : value(v) {} std::time_t value; }; // Get the current time. static time_type now() { return std::time(0); } // Add a duration to a time. static time_type add(const time_type& t, const duration_type& d) { return t + d.value; } // Subtract one time from another. static duration_type subtract(const time_type& t1, const time_type& t2) { return duration_type(t1 - t2); } // Test whether one time is less than another. static bool less_than(const time_type& t1, const time_type& t2) { return t1 < t2; } // Convert to POSIX duration type. static boost::posix_time::time_duration to_posix_duration( const duration_type& d) { return boost::posix_time::seconds(d.value); } }; typedef boost::asio::basic_deadline_timer< std::time_t, time_t_traits> time_t_timer; void handle_timeout(const boost::system::error_code&) { std::cout << "handle_timeout\n"; } int main() { try { boost::asio::io_service io_service; time_t_timer timer(io_service); timer.expires_from_now(5); std::cout << "Starting synchronous wait\n"; timer.wait(); std::cout << "Finished synchronous wait\n"; timer.expires_from_now(5); std::cout << "Starting asynchronous wait\n"; timer.async_wait(handle_timeout); io_service.run(); std::cout << "Finished asynchronous wait\n"; } catch (std::exception& e) { std::cout << "Exception: " << e.what() << "\n"; } return 0; }
AMDG Wenhao Xu wrote:
Hi everyone, I am a new to boost. When I compile the example of asio_timer, I have a compile error: " g++ -o test_timer test_timer.cpp -I /peter/boost/boost_1_36_0 -lboost_thread-gcc42-mt-1_36 -lboost_system-gcc42-mt-1_36 In file included from /usr/include/c++/4.2/iostream:44, from test_timer.cpp:11: /usr/include/c++/4.2/i486-linux-gnu/bits/c++config.h:149: error: expected constructor, destructor, or type conversion before ‘namespace’
Compilation exited abnormally with code 1 at Tue Oct 28 00:04:58" My compile command is: g++ -o test_timer test_timer.cpp -I /peter/boost/boost_1_36_0 -lboost_thread-gcc42-mt-1_36 -lboost_system-gcc42-mt-1_36
I cannot find the reason. Could you help me? Thanks very much.
Try preprocessing the file. Look for the last line of actual code before iostream is included. In Christ, Steven Watanabe
participants (2)
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Steven Watanabe
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Wenhao Xu