如何构建boost::asio::experimental
我想从页面构建一个示例: G++版本:7.3 Boost版本1.69如何构建boost::asio::experimental,boost,boost-asio,c++17,Boost,Boost Asio,C++17,我想从页面构建一个示例: G++版本:7.3 Boost版本1.69 #include <cstdlib> #include <deque> #include <iostream> #include <list> #include <memory> #include <set> #include <string> #include <utility> #include <boost/asio/e
#include <cstdlib>
#include <deque>
#include <iostream>
#include <list>
#include <memory>
#include <set>
#include <string>
#include <utility>
#include <boost/asio/experimental.hpp>
#include <boost/asio/io_context.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/read_until.hpp>
#include <boost/asio/signal_set.hpp>
#include <boost/asio/steady_timer.hpp>
#include <boost/asio/write.hpp>
using boost::asio::ip::tcp;
using boost::asio::experimental::awaitable;
using boost::asio::experimental::co_spawn;
using boost::asio::experimental::detached;
using boost::asio::experimental::redirect_error;
namespace this_coro = boost::asio::experimental::this_coro;
//----------------------------------------------------------------------
class chat_participant
{
public:
virtual ~chat_participant() {}
virtual void deliver(const std::string& msg) = 0;
};
typedef std::shared_ptr<chat_participant> chat_participant_ptr;
//----------------------------------------------------------------------
class chat_room
{
public:
void join(chat_participant_ptr participant)
{
participants_.insert(participant);
for (auto msg: recent_msgs_)
participant->deliver(msg);
}
void leave(chat_participant_ptr participant)
{
participants_.erase(participant);
}
void deliver(const std::string& msg)
{
recent_msgs_.push_back(msg);
while (recent_msgs_.size() > max_recent_msgs)
recent_msgs_.pop_front();
for (auto participant: participants_)
participant->deliver(msg);
}
private:
std::set<chat_participant_ptr> participants_;
enum { max_recent_msgs = 100 };
std::deque<std::string> recent_msgs_;
};
//----------------------------------------------------------------------
class chat_session
: public chat_participant,
public std::enable_shared_from_this<chat_session>
{
public:
chat_session(tcp::socket socket, chat_room& room)
: socket_(std::move(socket)),
timer_(socket_.get_executor().context()),
room_(room)
{
timer_.expires_at(std::chrono::steady_clock::time_point::max());
}
void start()
{
room_.join(shared_from_this());
co_spawn(socket_.get_executor(),
[self = shared_from_this()]{ return self->reader(); },
detached);
co_spawn(socket_.get_executor(),
[self = shared_from_this()]{ return self->writer(); },
detached);
}
void deliver(const std::string& msg)
{
write_msgs_.push_back(msg);
timer_.cancel_one();
}
private:
awaitable<void> reader()
{
auto token = co_await this_coro::token();
try
{
for (std::string read_msg;;)
{
std::size_t n = co_await boost::asio::async_read_until(socket_,
boost::asio::dynamic_buffer(read_msg, 1024), "\n", token);
room_.deliver(read_msg.substr(0, n));
read_msg.erase(0, n);
}
}
catch (std::exception&)
{
stop();
}
}
awaitable<void> writer()
{
auto token = co_await this_coro::token();
try
{
while (socket_.is_open())
{
if (write_msgs_.empty())
{
boost::system::error_code ec;
co_await timer_.async_wait(redirect_error(token, ec));
}
else
{
co_await boost::asio::async_write(socket_,
boost::asio::buffer(write_msgs_.front()), token);
write_msgs_.pop_front();
}
}
}
catch (std::exception&)
{
stop();
}
}
void stop()
{
room_.leave(shared_from_this());
socket_.close();
timer_.cancel();
}
tcp::socket socket_;
boost::asio::steady_timer timer_;
chat_room& room_;
std::deque<std::string> write_msgs_;
};
//----------------------------------------------------------------------
awaitable<void> listener(tcp::acceptor acceptor)
{
auto token = co_await this_coro::token();
chat_room room;
for (;;)
{
std::make_shared<chat_session>(
co_await acceptor.async_accept(token),
room
)->start();
}
}
//----------------------------------------------------------------------
int main(int argc, char* argv[])
{
try
{
if (argc < 2)
{
std::cerr << "Usage: chat_server <port> [<port> ...]\n";
return 1;
}
boost::asio::io_context io_context(1);
for (int i = 1; i < argc; ++i)
{
unsigned short port = std::atoi(argv[i]);
co_spawn(io_context,
[&]{ return listener(tcp::acceptor(io_context, {tcp::v4(), port})); },
detached);
}
boost::asio::signal_set signals(io_context, SIGINT, SIGTERM);
signals.async_wait([&](auto, auto){ io_context.stop(); });
io_context.run();
}
catch (std::exception& e)
{
std::cerr << "Exception: " << e.what() << "\n";
}
return 0;
}
首先,请确保定义
BOOST\u ASIO\u HAS\u CO\u wait
(显然,在查看错误消息时,您没有这样做)
其次,GCC7.3没有实验性的协同程序支持
- 魔杖盒:通用条款7.3
- 魔杖盒:Gcc 9.x
BOOST\u ASIO\u等待获取(显然,您没有,查看错误消息)
其次,GCC7.3没有实验性的协同程序支持
- 魔杖盒:通用条款7.3
请使用更高版本的编译器,或者不要使用实验性的协同程序支持
注:Wandbox上的Gcc标题9.x(2018012)似乎还不支持这一点
- 魔杖盒:Gcc 9.x
我已将boost升级到1.70+并成功构建了协同程序ts示例。尽管一些API已经更改,并且现在没有实验性的
头/名称空间,但构建配置几乎相同
依赖关系:
- 编译程序:铿锵8+
- (可选)CMake
CMake:
cmake_minimum_required(VERSION 3.9)
project(chat_server)
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(CMAKE_CXX_COMPILER "clang++")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++ -lc++abi")
set(CMAKE_CXX_FLAGS "-fcoroutines-ts --stdlib=libc++ -Xclang -fconcepts-ts")
find_package(Boost COMPONENTS system)
include_directories(
${BOOST_INCLUDE_DIRS}
)
add_executable(chat_server chat_server.cpp)
target_link_libraries(cpptest
${Boost_LIBRARIES}
pthread
)
我已经将boost更新为1.70+并成功构建了协同程序ts示例。尽管一些API已经更改,并且现在没有实验性的
头/名称空间,但构建配置几乎相同
依赖关系:
- 编译程序:铿锵8+
- (可选)CMake
CMake:
cmake_minimum_required(VERSION 3.9)
project(chat_server)
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(CMAKE_CXX_COMPILER "clang++")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++ -lc++abi")
set(CMAKE_CXX_FLAGS "-fcoroutines-ts --stdlib=libc++ -Xclang -fconcepts-ts")
find_package(Boost COMPONENTS system)
include_directories(
${BOOST_INCLUDE_DIRS}
)
add_executable(chat_server chat_server.cpp)
target_link_libraries(cpptest
${Boost_LIBRARIES}
pthread
)
只是好奇。我只是在asio coro的例子中偶然发现了这个问题。但是为什么boost::beast在示例中使用协同路由和无堆栈的coros,而这在linux上可以工作呢?我清楚地看到他们使用了不同的include,但是boostcoro实现中发生了什么,万一在asio上它不工作,而在beast上它工作呢?虽然野兽使用了asio。。。我在这里迷路了:)你有链接@kreuzerkrieg吗?我不知道你的意思,真的(你遇到了什么问题,它们包括什么等等)我的意思是这个和这个已经有区别了,beast使用coro和asio使用TS
coro,这与GCCIt不起作用。它确实有助于使用专有名称,而不是匆忙地缩写一切:)“beast使用Boost Coroutine”实际上,这是你的意思,与“野兽使用科罗”相反。同样,您的意思是“Boost Asio使用协同路由TS”(与独立Asio相反)并不明显,但我假设是前者。只是好奇而已。我只是在asio coro的例子中偶然发现了这个问题。但是为什么boost::beast在示例中使用协同路由和无堆栈的coros,而这在linux上可以工作呢?我清楚地看到他们使用了不同的include,但是boostcoro实现中发生了什么,万一在asio上它不工作,而在beast上它工作呢?虽然野兽使用了asio。。。我在这里迷路了:)你有链接@kreuzerkrieg吗?我不知道你的意思,真的(你遇到了什么问题,它们包括什么等等)我的意思是这个和这个已经有区别了,beast使用coro和asio使用TS
coro,这与GCCIt不起作用。它确实有助于使用专有名称,而不是匆忙地缩写一切:)“beast使用Boost Coroutine”实际上,这是你的意思,与“野兽使用科罗”相反。同样,您的意思是“Boost Asio使用协同路由TS”(与独立Asio相反)并不明显,但我假设是前者。