#include <iostream>

using namespace std;

/**

?* 定義模板函數swapNum

?* 實現功能：交換兩個數的位置

?*/

template <typename T>

void swap(T &a,T &b)

{

? ? T temp = a;

? ? a = b;

? ? b = temp;

}

int main(void)

{

? ? int x = 10;

? ? int y = 20;

? ? // 調用模板函數

? ? swap<int>(x,y);

? ? ? ? cout << "x = " << x << endl;

? ? ? ? cout << "y = " << y << endl;

return 0;

}

l報錯：/477/9670/FmcL/index.cpp: In function 'int main()':
/477/9670/FmcL/index.cpp:22:18: error: call of overloaded 'swap(int&, int&)' is ambiguous
? ? swap(x,y);
? ? ? ? ? ? ? ? ?^
/477/9670/FmcL/index.cpp:22:18: note: candidates are:
/477/9670/FmcL/index.cpp:9:6: note: void swap(T&, T&) [with T = int]
void swap(T &a,T &b)
? ? ?^
In file included from /usr/include/c++/4.8.2/bits/stl_pair.h:59:0,
? ? ? ? ? ? ? ? from /usr/include/c++/4.8.2/bits/stl_algobase.h:64,
? ? ? ? ? ? ? ? from /usr/include/c++/4.8.2/bits/char_traits.h:39,
? ? ? ? ? ? ? ? from /usr/include/c++/4.8.2/ios:40,
? ? ? ? ? ? ? ? from /usr/include/c++/4.8.2/ostream:38,
? ? ? ? ? ? ? ? from /usr/include/c++/4.8.2/iostream:39,
? ? ? ? ? ? ? ? from /477/9670/FmcL/index.cpp:1:
/usr/include/c++/4.8.2/bits/move.h:166:5: note: void std::swap(_Tp&, _Tp&) [with _Tp = int]
? ? swap(_Tp& __a, _Tp& __b)
? ? ^