T fref(const T&, const T&);中的const T&,是什么意思？是reference arguments的话&后面不是有一个value的吧？(象const T&x，const T&y);
templateT fobj(T, T); // arguments are copied
template
T fref(const T&, const T&);
// reference arguments
string s1("a value");
const string s2("another value");
fobj(s1, s2);
// ok: calls f(string, string), const is ignored
fref(s1, s2);
// ok: non const object s1 converted to const reference
int a[10], b[42];
fobj(a, b); // ok: calls f(int*, int*)
fref(a, b); // error: array types don't match; arguments aren't converted to pointers
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