请教关于 c++ string的 transform()函数

[zhen_4321]

#include<iostream>
#include<cctype>
#include<string>
#include<iterator>
using namespace std;
int main()
{
string s("ni hao");
cout<<s<<endl;
transform(s.begin(),s.end(),s.begin(),toupper);
cout<<s<<endl;
}

../src/stringDemo.cpp:113: 错误：对 ‘transform(__gnu_cxx::__normal_iterator<char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, <unresolved overloaded function type>)’ 的调用没有匹配的函数

[airtrack]

#include <algorithm>

[huangyu20072010]

cout后面不要用< <，改成<<
其他就没看到什么错了，在我的编译器（vs2005）里面也能通过啊
另外，transform可不是string的函数，那个是STL里面的。

[airtrack]

这个程序先包含#include <algorithm>之后在vc2008下没错，在gcc下确实会报像楼主的一样的错误。

[airtrack]

http://www.megasolutions.net/cplus/GCC-MSVC++-difference-32501.aspx
这个可能解释了原因，其中有一段话：

Right. The problem you face is that VC++ conforms better to the C++
Standard than does GCC. The former provides the required overloads
for exp; the latter is at the mercy of the underlying C library to
provide those overloads, and certainly glibc fails to do so. By
interposing the wrapper function, you disambiguate the call to
transform.
HTH,
P.J. Plauger
Dinkumware, Ltd.

[airtrack]

把程序改成这样，gcc下就不会报错了。

#include <iostream>
#include <cctype>
#include <string>
#include <iterator>
#include <algorithm>
// using namespace std;

int main()
{
    std::string s("ni hao");
    std::cout << s <<std::endl;
    std::transform(s.begin(), s.end(), s.begin(), toupper);
    std::cout << s <<std::endl;
    return 0;
}

[ffffffflie]

#include <iostream>
#include <cctype>
#include <string>
#include <iterator>
using namespace std;
int main()
{
string s("ni hao");
cout < <s < <endl;
transform(s.begin(),s.end(),s.begin(),::toupper);
cout < <s < <endl;
}

这样更简单！！

[bfhtian]

[Quote=引用 6 楼 freeflies 的回复:]
#include <iostream>
#include <cctype>
#include <string>
#include <algorithm> //
using namespace std;
int main()
{
string s("ni hao");
cout < <s < <endl;
transform(s.begin(),s.end(),s.begin(),::toupper);
cout < <s < <endl;
}

这样更简单！
[/Quote]
头文件换一下