函数模板

示例：求最大项

#include<iostream>
using namespace std;
template <class T>
void Max(T a,T b)
{
    if(a>b)
        cout<<a<<" is greater"<<endl;
    else
        cout<<b<<" is greater"<<endl;
}
int main() {
    string a="abc";
    string b="xyz";
    Max(a, b);
    Max<double>(1.1, 2.1);
}

传递参数

必须显式调用，参数可以缺省

#include<iostream>
using namespace std;
T* newmemomry() {
    T *p = new T[size];
    cout << "memory has been malloc" << endl;
    return p;
}
void testnewmemomry() {
    int *p = newmemomry<int, 10>();
    double *q = newmemomry<double, 10>();
    char *r = newmemomry<char, 10>();
}
int main() {
    testprint();
}

函数模板重载

先匹配普通函数
再寻求函数模板

#include<iostream>
using namespace std;
template<class T>
void print(T a)
{
    cout << "函数模板..." << endl;
    cout<<a<<endl;
}
void print(int a)
{
    cout << "普通函数..." << endl;
    cout<<a<<endl;
}
void testprint() {
    print(1);
    print(1.1);
    print<int>(1);
    print("hello");
}
int main() {
    testprint();
}