Question

我试图从字符串中提取不同类型的数据。

void                    readHeader(char buf[BUFFSIZE])
{
  std::istringstream    hdr(buf);
  __uint128_t           id_client;

  hdr >> id_client; // doesn't compile
}

我执行此操作时遇到此错误hdr >> id_client：

Unix/UnixSocket.cpp:158:10: error: ambiguous overload for ‘operator>>’ in ‘hdr >> id_client’ Unix/UnixSocket.cpp:158:10: note: candidates are: In file included from /usr/include/c++/4.7/sstream:39:0,
                 from Unix/UnixSocket.cpp:11: /usr/include/c++/4.7/istream:118:7: note: std::basic_istream<_CharT,
_Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__istream_type& (*)(std::basic_istream<_CharT, _Traits>::__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT,
_Traits>::__istream_type = std::basic_istream<char>] <near match> /usr/include/c++/4.7/istream:118:7: note:   no known conversion for argument 1 from ‘__int128 unsigned’ to ‘std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&) {aka std::basic_istream<char>& (*)(std::basic_istream<char>&)}’ /usr/include/c++/4.7/istream:122:7: note: std::basic_istream<_CharT,
_Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__ios_type& (*)(std::basic_istream<_CharT, _Traits>::__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT,
_Traits>::__istream_type = std::basic_istream<char>; std::basic_istream<_CharT, _Traits>::__ios_type = std::basic_ios<char>] <near match> /usr/include/c++/4.7/istream:122:7:

有没有办法将id_client正确存储在此__uint128_t变量中？

Answer 1

https://gmplib.org/可能有所帮助。 gmpxx对象抽象的mpz_class类支持I / O运算符，mpz_export（...）函数允许您将结果转换为字节数组。如果它们超过16个字节，您可能会抛出异常或抱怨。不是很快，但我想快速实施。

使用stringstreams将字符串转换为__uint128_t

1 个答案: