[Dev-C++] function name conflict

[DC A <ad...@ho...>]

If you look at the code below you can't compile this code(gnu c++).

#include <iostream>
#include <string>
using std::cout;
using std::endl;
using std::string;

string plus(string x, string y)
{
   string a(x);
   string b(y);

   string c = a + b;

   return c;
}

int main()
{
   string s1 = "aaa";
   string s2 = "bbb";
   string s3 = plus(s1, s2);

   cout << s3 << endl;

   return 0;
}


It gives an error:


/usr/include/c++/3.3/bits/stl_function.h: In function `int main()':
/usr/include/c++/3.3/bits/stl_function.h:128: error: `template<class _Tp>
struct std:plus' is not a function,
test2.cc:8: error: conflict with `std::string plus(std::basic_string<char,
std::char_traits<char>, std::allocator<char> >, std::basic_string<char,
std::char_traits<char>, std::allocator<char> >)'
test2.cc:21: error: in call to `plus'


Here plus is a function outside of any namespace. Also plus is a structure
defined inside std namespace. so why can't compiler compile the above code?
What's wrong?

Thanks.

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