#include <iostream>
#include <string>
#include <map>
#include <string.h>
using namespace std;
class Test
{
public:
Test()
{
m_map.insert(std::pair<string, Call>("add", (Call)&Test::add));
m_map.insert(std::pair<string, Call>("sub", (Call)&Test::sub));
m_map.insert(std::pair<string, Call>("mul", (Call)&Test::mul));
}
void print(string method, int a, int b)
{
Mapit it = m_map.find(method);
if (it == m_map.end())
{
cout << "no find function: " << method << endl;
}
else
{
(this->*m_map[method])(a, b);
}
}
public:
///Call是函數指針,有2個int類型的形參和void的返回值
typedef void (Test::*Call)(int a, int b);
///CallMap是map<string, Call>這種數據類型的別名
///用CallMap定義了一個成員變量m_map
typedef map<string, Call> CallMap;
CallMap m_map;
///MapIt是CallMap::iterator這種迭代器的別名
typedef CallMap::iterator Mapit;
///可以將add,sub和mul這三個函數放到m_map中
void add(int a, int b)
{
cout << "a + b = " << a + b << endl;
}
void sub(int a, int b)
{
cout << "a - b = " << a - b << endl;
}
void mul(int a, int b)
{
cout << "a * b = " << a * b << endl;
}
};
int main()
{
Test test;
///根據字符串找到想對應的函數進行操作
test.print("add", 2, 1);
test.print("sub", 2, 1);
test.print("mul", 2, 2);
test.print("div", 2, 2);
return 0;
}