我试图用 boost :: log 库输出 boost :: asio :: streambuf 对象的内容。我通过以下方式定义了 operator<< 重载:
ostream& operator<<(ostream& ostr, const boost::asio::streambuf& buffer)
{
for (size_t i = 0; i < buffer.size(); ++i)
{
ostr << hex << (int) buffer_cast<const char*>(buffer.data())[i] << " ";
}
return ostr;
}
但是在尝试输出缓冲区的内容之后:
BOOST_LOG_TRIVIAL(trace) << buffer;
我有以下错误:
包含来自的文件 /home/bobeff/work/asio_netcomm_poc/third_party/lib/boost/boost/log/sources/record_ostream.hpp:31:0, 来自/home/bobeff/work/asio_netcomm_poc/third_party/lib/boost/boost/log/trivial.hpp:23, 来自/home/bobeff/work/asio_netcomm_poc/server/src/server.cpp:14: /home/bobeff/work/asio_netcomm_poc/third_party/lib/boost/boost/log/utility/formatting_ostream.hpp: 在实例化&#39; typename boost :: log :: v2_mt_posix :: aux :: enable_if_formatting_ostream :: type boost :: log :: v2_mt_posix :: operator&lt;&lt;(StreamT&amp;,T&amp;) [使用StreamT = 提高::登录:: v2_mt_posix :: basic_formatting_ostream; T = 提高:: ASIO :: basic_streambuf&LT;取代;类型名 boost :: log :: v2_mt_posix :: aux :: enable_if_formatting_ostream :: type = 提高::登录:: v2_mt_posix :: basic_formatting_ostream和放大器;&#39 ;: /home/bobeff/work/asio_netcomm_poc/third_party/lib/boost/boost/log/sources/record_ostream.hpp:212:51: 需要来自&#39; typename boost :: log :: v2_mt_posix :: aux :: enable_if_record_ostream :: type boost :: log :: v2_mt_posix :: operator&lt;&lt;(StreamT&amp;,T&amp;) [使用StreamT = boost :: log :: v2_mt_posix :: basic_record_ostream; Ť = boost :: asio :: basic_streambuf&lt;&gt ;; typename boost :: log :: v2_mt_posix :: aux :: enable_if_record_ostream :: type = 提高::登录:: v2_mt_posix :: basic_record_ostream和放大器;]&#39; /home/bobeff/work/asio_netcomm_poc/server/src/server.cpp:88:47:
从这里要求 /home/bobeff/work/asio_netcomm_poc/third_party/lib/boost/boost/log/utility/formatting_ostream.hpp:840:19: 错误:无法绑定 &#39;的boost ::登录:: v2_mt_posix :: basic_formatting_ostream :: ostream_type {aka std :: basic_ostream}&#39; lvalue to&#39; std :: basic_ostream&amp;&amp;&#39; strm.stream()&lt;&lt;值; ^在/usr/include/c++/4.8/iostream:39:0中包含的文件中, 来自/home/bobeff/work/asio_netcomm_poc/server/src/server.cpp:1: /usr/include/c++/4.8/ostream:602:5:错误:初始化参数1 &#39; std :: basic_ostream&lt; _CharT,_Traits&gt;&amp; std :: operator&lt;&lt;(std :: basic_ostream&lt; _CharT,_Traits&gt;&amp;&amp;,const _Tp&amp;) [与_CharT = char; _Traits = std :: char_traits; _Tp = 提高:: ASIO :: basic_streambuf&LT;&GT;]&#39; 运算符&lt;&lt;(basic_ostream&lt; _CharT,_Traits&gt;&amp;&amp; __os,const _Tp&amp; __x) ^
输出缓冲区内容的正确方法是什么?