重载运算符 << Boost Log

Question

inline std::ostream& operator<<(std::ostream& p, const std::vector<unsigned int>& vector){
  p << "[ ";
  for(auto i:vector){
    p << " "<< i << " ,";
  }
  p<< "]";
  return p;
}

#define LOG_DEBUG_MESSAGE BOOST_LOG_SEV(my_logger::get(), debug)


std::vector<unsigned int> test {1, 2, 3};
LOG_DEBUG_MESSAGE << "test "<< test;
std::cout << test  << std::endl;

你好，

我为 std::vector 重载了运算符

boost/log/utility/formatting_ostream.hpp:710:19：错误：无法绑定 'boost::log::v2_mt_posix::basic_formatting_ostream::ostream_type {aka std::basic_ostream}' 左值到 'std::basic_ostream&&' strm.stream()

/opt/gcc.4.9.1/include/c++/4.9.1/ostream:602:5：注意：正在初始化 'std::basic_ostream<_chart _traits>& 的参数 1 std::operator&&, const _Tp&) [与_CharT = char; _Traits = std::char_traits; _Tp = 标准::向量]' 运算符&& __os, const _Tp& __x)

我不知道为什么 boost 日志不起作用。它使用相同的

Answer 1

'boost::log::basic_formatting_ostream 不是从 std::ostream 派生的。

你应该为 std::vector 重载操作符

查看下面修改后的代码示例：

inline boost::log::formatting_ostream& operator<<(boost::log::formatting_ostream& p,  std::vector<int>& vector)
{
        p << "[ ";
        for(auto i:vector){
            p << " "<< i << " ,";
        }
        p<< "]";
        return p;
}