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我有这段代码，它使用 Sun Studio 编译，但在 g++ 中出现错误

DBManager & DBManager::operator >> (UtlString &value)
{
  //## begin DBManager::operator>>%921890065.body preserve=yes
        if(_state == DBMRan){
                _reader >> static_cast<std::string>(value);
        }
        return *this;
  //## end DBManager::operator>>%921890065.body
}

DBManager.cpp:263: error: no match for âoperator>>â in â((DBManager*)this)->DBManager::_reader >> std::basic_string<char, std::char_traits<char>, std::allocator<char> >(((const std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)((const std::basic_string<char, std::char_traits<char>, std::allocator<char> >*)(&((jda::UtlString*)value)->jda::UtlString::<anonymous>))))â
DBReader.h:50: note: candidates are: virtual DBReader& DBReader::operator>>(char&)
DBReader.h:51: note:                 virtual DBReader& DBReader::operator>>(unsigned char&)
DBReader.h:52: note:                 virtual DBReader& DBReader::operator>>(short int&)
DBReader.h:53: note:                 virtual DBReader& DBReader::operator>>(short unsigned int&)
DBReader.h:54: note:                 virtual DBReader& DBReader::operator>>(int&)
DBReader.h:55: note:                 virtual DBReader& DBReader::operator>>(unsigned int&)
DBReader.h:56: note:                 virtual DBReader& DBReader::operator>>(long int&)
DBReader.h:57: note:                 virtual DBReader& DBReader::operator>>(long long int&)
DBReader.h:58: note:                 virtual DBReader& DBReader::operator>>(long unsigned int&)
DBReader.h:59: note:                 virtual DBReader& DBReader::operator>>(long long unsigned int&)
DBReader.h:60: note:                 virtual DBReader& DBReader::operator>>(float&)
DBReader.h:61: note:                 virtual DBReader& DBReader::operator>>(double&)
DBReader.h:62: note:                 virtual DBReader& DBReader::operator>>(DBDateTime&)
DBReader.h:63: note:                 virtual DBReader& DBReader::operator>>(DBBlob&)
DBReader.h:64: note:                 virtual DBReader& DBReader::operator>>(std::string&)
DBReader.h:65: note:                 virtual DBReader& DBReader::operator>>(DBNullIndicator&)
otlv4.h:35416: note:                 otl_connect& operator>>(otl_connect&, otl_stream&)

正如您在上面的错误消息中看到的那样，DBReader 类具有 operator>>，它通过引用获取 std::string 并且 UtlString 类是从 std::string 派生的，因此 static_cast 应该不是问题，但编译器仍然抱怨没有匹配的方法. 还有谁能告诉我如何删除出现在错误消息中的字符。

谢谢

4

1 回答 1

2

您可以从 UtlString 构建一个临时的 std::string。 

std::string tmp(value);    
if(_state == DBMRan){    
    _reader >> tmp;    
}

这至少应该适用于两个编译器。

于 2013-09-24T08:15:01.223 回答