当模板函数比普通函数更好匹配形参的时候，会优先调用模板函数

#include "iostream"using namespace std;template <class T>
void show(T a, T b)
{cout << a << endl;cout << b << endl;cout << "temp show" << endl;
}void show(int a, float b)
{cout << a << endl;cout << b << endl;cout << "show" << endl;
}int main()
{int a = 100;float b = 3.14;int c = 99;show(a, b);show(a, c);
}

当模板函数和普通函数实现相同功能的时候，会优先调用普通函数

#include "iostream"using namespace std;template <class T>
void show(T a, T b)
{cout << a << endl;cout << b << endl;cout << "temp show" << endl;
}void show(int a, int b)
{cout << a << endl;cout << b << endl;cout << "show" << endl;
}int main()
{int a = 100;int c = 99;show(a, c);
}

当模板函数和普通函数实现相同功能且不想调用普通函数时可用<>指定

#include "iostream"using namespace std;template <class T>
void show(T a, T b)
{cout << a << endl;cout << b << endl;cout << "temp show" << endl;
}void show(int a, int b)
{cout << a << endl;cout << b << endl;cout << "show" << endl;
}int main()
{int a = 100;int c = 99;show<>(a, c);
}