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yupub

//========demo.cpp=========
using namespace std;
#include <iostream.h>
#include <vector>
#include <string>

int main(void)
{
    vector<string> arrayitem;
    arrayitem.push_back("====1======");
    arrayitem.push_back("====2======");
    arrayitem.push_back("====3======");
    vector<string>::iterator it_item = arrayitem.begin();
    for (; it_item != arrayitem.end(); it_item++)
    {
        cout << "===>" << it_item << endl;
    }
    return 0;
}

g++ -o demo demo.cpp
报错如下
demo.cpp:1: warning: namespaces are mostly broken in this version of g++
In file included from /usr/local/lib/g++-include/std/bastring.h:571,
                 from /usr/local/lib/g++-include/std/string.h:6,
                 from /usr/local/lib/g++-include/string:5,
                 from demo.cpp:4:
/usr/local/lib/g++-include/std/sinst.h:60: ambiguous template instantiation for `operator !=(const char *, const basic_string<char,string_char_traits<char> > &)' requested
/usr/local/lib/g++-include/std/sinst.h:60: ambiguous template instantiation for `operator !=(const basic_string<char,string_char_traits<char> > &, const char *)' requested
/usr/local/lib/g++-include/std/sinst.h:62: ambiguous template instantiation for `operator >(const char *, const basic_string<char,string_char_traits<char> > &)' requested
/usr/local/lib/g++-include/std/sinst.h:62: ambiguous template instantiation for `operator >(const basic_string<char,string_char_traits<char> > &, const char *)' requested
/usr/local/lib/g++-include/std/sinst.h:63: ambiguous template instantiation for `operator <=(const char *, const basic_string<char,string_char_traits<char> > &)' requested
/usr/local/lib/g++-include/std/sinst.h:63: ambiguous template instantiation for `operator <=(const basic_string<char,string_char_traits<char> > &, const char *)' requested
/usr/local/lib/g++-include/std/sinst.h:64: ambiguous template instantiation for `operator >=(const char *, const basic_string<char,string_char_traits<char> > &)' requested
/usr/local/lib/g++-include/std/sinst.h:64: ambiguous template instantiation for `operator >=(const basic_string<char,string_char_traits<char> > &, const char *)' requested

yupub

要把
#include <string>
放到前面去！

lelecool

cout << "===>" << it_item << endl;
should be replaced by
cout << "===>" << it_item->c_str() << endl;