c++ - 无法使用boost::asio::yield_context编译boost::asio::spawn程序

Question

我想使用boost::asio从多个stdout中同时读取stderr和boost::process。但是，我在使用boost::asio时遇到了编译问题，可以重建以下无法编译的最小示例:

#include <boost/asio.hpp>
#include <boost/asio/spawn.hpp>

int main() {
    boost::asio::io_context ios;
    boost::asio::spawn(ios,
            [](boost::asio::yield_context ctx) {
            });
    ios.run();
    return 0;
}

启用 10.2.0并链接到 C++17版本 boost的GCC 1.72结果如下:

In file included from /usr/include/boost/coroutine/coroutine.hpp:10,
                 from /usr/include/boost/coroutine/all.hpp:11,
                 from /usr/include/boost/asio/spawn.hpp:19,
                 from [...]/main.cpp:3:
/usr/include/boost/coroutine/asymmetric_coroutine.hpp: In function ‘typename boost::coroutines::pull_coroutine<R>::iterator boost::coroutines::begin(boost::coroutines::pull_coroutine<Arg>&)’
/usr/include/boost/coroutine/asymmetric_coroutine.hpp:2364:17: error: ‘begin’ is not a member of ‘boost’
 2364 | { return boost::begin( c); }

Answer 1

是的，这是特定版本的Boost中缺少的间接包含。看到它live on wandbox。
要么

升级以提升1.73，live

包括相关的标题also live:

#include <boost/asio.hpp>
#include <boost/range/begin.hpp>
#include <boost/range/end.hpp>
#include <boost/asio/spawn.hpp>

int main() {
    boost::asio::io_context ios;
    boost::asio::spawn(ios,
            [](boost::asio::yield_context ctx) {
            });
    ios.run();
    return 0;
}