一、二维数组

#include <iostream>
#include<windows.h>
#include <map>
//	SetConsoleOutputCP ( CP_UTF8 ) ; 
using namespace std;void test1()
{map<int, map<string,float>> m;m[0]["sch"] = 1.1;m[1]["hsd"] = 2.2;for (map<int, map<string,float>>::iterator it = m.begin(); it != m.end();it++){for ( map<string, float>::iterator it2= it->second.begin(); it2 != it->second.end();it2++){cout << it2->first<<" : "<<it2->second<<" ";}cout << endl;}
}void test2()
{map<int, string> m;m[0]= "sch";m[1]= "hsd";for (map<int, string>::iterator it = m.begin(); it != m.end();it++){cout << it->first <<"  "<<it->second<< endl;}
}void test3()
{array<int ,6> a={1,2,3,4,5,6};cout<< a.size()<< endl;for(unsigned int i(0);i < a.size(); i++){cout<< a[i]<< endl;}
}int main() {SetConsoleOutputCP ( CP_UTF8 );test1();system("pause");return 0;
}

二、私有成员

#include <iostream>
#include<windows.h>
#include <map>
//	SetConsoleOutputCP ( CP_UTF8 ) ; 
using namespace std;class myclass{
public:struct Store{int id;int value;bool status;};void test6(int number);private:Store a;
};void my_print(const myclass::Store &store){cout<<"store.id == "<<store.id<<endl;cout<<"store.status == "<<store.status<<endl;cout<<"store.value == "<<store.value<<endl;cout<<"-------------------------------------------"<<endl;
}void myclass::test6(int number){if(number==0){a.id=0;a.value=0;a.status=false;}else{a.id =1;	a.status=true;a.value =number;}myclass::Store & s= a;cout<< "a的地址== "<<&a<<endl;my_print(s);
}int main() {SetConsoleOutputCP ( CP_UTF8 );myclass c;c.test6(0);c.test6(1);c.test6(0);system("pause");return 0;
}

三、function用法

#include <iostream>
#include<windows.h>
#include <functional>
//	SetConsoleOutputCP ( CP_UTF8 ) ; 
using namespace std;
class A
{std::function<void(void)> callback_;
public:A(const std::function<void(void)>& f):callback_(f){}void notify(){callback_();}
};class Foo
{
public:void operator()(void){std::cout << __FUNCTION__ << std::endl;}
};void call_when_even(int x, const std::function<void(int)>& f)
{if (x % 2 == 0) {f(x);}else {f(0);}
}void output(int x)
{std::cout<< x << ""<<endl;
}int main() {SetConsoleOutputCP ( CP_UTF8 );Foo foo;A aa(foo);aa.notify();    call_when_even(1,output);system("pause");return 0;
}

四、类里面创建另一个类

#include <iostream>
#include<windows.h>
#include <map>
#include <functional>
//	SetConsoleOutputCP ( CP_UTF8 ) ; 
using namespace std;class A
{public: A(){cout<<"A 构造"<<endl;}A(int a,int b){cout<<a<<endl;cout<<b<<endl;}int a;~A(){cout<<"A 析构"<<endl;}
};class C
{public: C(){cout<<"C 构造"<<endl;}C(int a,int b){cout<<a<<endl;cout<<b<<endl;}int a;~C(){cout<<"C 析构"<<endl;}
};class B{
public:B(){cout<<"B 构造"<<endl;}~B(){cout<<"B 析构 "<<endl;}private:A a;
public:C c;
};void test()
{B b;
}int main() {SetConsoleOutputCP ( CP_UTF8 );if(-1)test();system("pause");return 0;
}

五、lambda

#include <iostream>
#include<windows.h>
#include <map>
#include <functional>
//	SetConsoleOutputCP ( CP_UTF8 ) ; 
using namespace std;using fun_name=std::function<void(int b,int c)>;
void fun(int a, std::function<void(int b,int c)> f)
{cout <<__FUNCTION__ <<  ":   "<< a <<endl;fun_name d=f;cout <<__FUNCTION__ <<  " 内的 f 函数"<<endl;f(4,6);cout <<__FUNCTION__ <<  " 内的 d 函数"<<endl;d(90,9);
}void fun2(int b, int c)
{cout <<__FUNCTION__<<  ":   "<<"b+c = "<<b+c <<endl;
}void test()
{int g =100;fun( 1,[&](int d, int e){g++; fun2(d,e);cout <<__FUNCTION__<<  ":   "<<"g = "<<g <<endl;});
}int main() {SetConsoleOutputCP ( CP_UTF8 );test();system("pause");return 0;
}结果打印：fun:   1fun 内的 f 函数fun2:   b+c = 10operator():   g = 101fun 内的 d 函数fun2:   b+c = 99operator():   g = 102

六、Map动态申请

#include <iostream>
#include<windows.h>
#include <map>
#include <functional>
//	SetConsoleOutputCP ( CP_UTF8 ) ; 
using namespace std;enum mGroup{GROUP_1=0,GROUP_2=1,GROUP_3=2,GROUP_4=3,GROUP_5=4,GROUP_6=5,
};class A{
public:struct Store{int id;array<int,8>data;bool status;};A(){cout <<"A 构造"<<endl;}~A(){cout <<"A 析构"<<endl;}void initStore();private:map<mGroup,map<int, Store>> m_map;
};void A::initStore(){m_map[GROUP_1][0].id = 1;m_map[GROUP_1][1].data.fill(0x02);for(int i=0; i<5; i++){cout << m_map[GROUP_1].size() << "   ID ="<<m_map[GROUP_1][i].id <<"  :" ;for (int j = 0; j < 8  ; j++){	cout<<m_map[GROUP_1][i].data[j]<<"  ";}cout<<endl;}
}int main() {SetConsoleOutputCP ( CP_UTF8 );A a;a.initStore();system("pause");return 0;
}
运行结果：A 构造2   ID =1  :0  0  0  0  0  0  0  02   ID =0  :2  2  2  2  2  2  2  22   ID =0  :0  0  0  0  0  0  0  03   ID =0  :0  0  0  0  0  0  0  04   ID =0  :0  0  0  0  0  0  0  0