c++11新特性的简单介绍

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

using std::cout;
using std::cin;
using std::endl;
using std::vector;
using std::string;
using std::for_each;
using std::shared_ptr;
using std::thread;

std::mutex g_mutex;

void my_thread1(int num, const string& str){
	g_mutex.lock();
	for(int i=0; i<10; i++){
		cout << "num:" << num << ", name:" << str << endl;
	}
	g_mutex.unlock();
}

void my_thread2(){
	int g_num = 20;
	for (int i=0; i<10; i++){
		cout << "num:" << g_num << endl;
	}
}

int main(int argc,char * argv [ ]){
	//类型推导
	//auto自动根据初始化子的类型产生参数，首先应有被明确初始化的参数
	vector myvec(3, 4);
	for (auto itr = myvec.cbegin();itr != myvec.cend();itr++){
		cout << *itr << endl;
	}

	int my_array[4] = {1,2,3,4};
	for (auto &x : my_array){
		x *= 2;
		cout << x << endl;
	}

	//lambda函数，用[&]声明
	vector someList(2, 5);
	int total = 0;
	int value = 10;
	for_each(someList.begin(), someList.end(), [&, value](int x){
		total += (x * value);
	});
	cout << total << endl;

	//空指针nullptr
	char *pc = nullptr;
	char str[] = "hello world";
	pc = str;
	cout << pc << endl;

	//通用智能指针
	shared_ptr p_first(new double);
	shared_ptr p_copy = p_first;
	*p_copy = 21.1;
	cout << *p_first << endl;

	//c++11线程类std::thread，独占式互斥量std::mutex，允许超时的互斥量
	int num = 1234;
	string str_td = "qwer";
	thread t(my_thread1,num,str_td);
	thread t1(my_thread2);
	t.join();
	t1.join();

	return 0;
}