lambda表达式：

[](){}

[]捕获列表

() 函数的参数列表

{}函数的函数体

#include<iostream>
#include<string>
using std::cout;
using std::endl;
using std::string;
void func() {
	cout << "hello func" << endl;
}

void test() {
	int a = 100;
	[]()->void {
		cout << "hello" << endl;
	}();
	[&a]()->void {
		++a;
		cout << "hello" << a << endl;
	}();
	cout << "======a" << a << endl;
}

void test2() {
	[](const string& name){
		cout << "test2" << endl;
		cout << "name = " << name << endl;
	}("wangdao");

	auto f = [](const string& name) {
		cout << "test2" << endl;
		cout << "name = " << name << endl;
	};
	f("wangd==");
	typedef void(*pFunc)(const string&); // C
	//using pFunc = void(const string&);
	pFunc pf = [](const string& name) {
		cout << "test2" << endl;
		cout << "name = " << name << endl;
	};
	pf("wdwh");
}

int main() {
	test2();
	return 0;
	
}

int main() {
	//test2();
	int num = 10;
	std::string str("wd");
	[num, str](const string &value) {
		cout << "num = " << num << endl;
		cout << "str = " << str << endl;
		cout << "str = " << value << endl;
	}("hello");
	// num采用引用传递，其他变量使用值传递
	[=, &num](const string &value) {
		cout << "num = " << ++num << endl;
		cout << "str = " << str << endl;
		cout << "str = " << value << endl;
	}("hello");
	// num采用值传递，其他变量使用引用传递
	[&, num](const string &value) {
		cout << "num = " << num << endl;
		cout << "str = " << str << endl;
		cout << "str = " << value << endl;
	}("hello");

	return 0;
	
}