右值引用疑惑

chllcy88

int XXX(int &&a)
{
    cout << "aa" << ++a << endl;   
}

int a = 0;
XXX(a);
编译报错
test.cpp:131:10: 错误：无法将左值‘int’绑定到‘int&&’
test.cpp:33:5: 错误：以初始化‘int XXX(int&&)’的实参 1

======================
template<typename T>
int XXX(T &&a)
{
    cout << "aa" << ++a << endl;   
}

int a = 0;
XXX(a);

这样就正常了，请问是什么原因？跟模板有关？

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