int m = [](int x) { return [](int y) { return y * 2; }(x)+6; }(5);

std::cout << "m:" << m << std::endl; 　　 //输出m:16

std::cout << "n:" << [](int x, int y) { return x + y; }(5, 4) << std::endl; //输出n:9

auto gFunc = [](int x) -> function<int(int)> { return [=](int y) { return x + y; }; };

auto lFunc = gFunc(4);

std::cout << lFunc(5) << std::endl;

auto hFunc = [](const function<int(int)>& f, int z) { return f(z) + 1; };

auto a = hFunc(gFunc(7), 8);

int a = 111, b = 222;

auto func = [=, &b]()mutable { a = 22; b = 333; std::cout << "a:" << a << " b:" << b << std::endl; };

func();

std::cout << "a:" << a << " b:" << b << std::endl;

a = 333;

auto func2 = [=, &a] { a = 444; std::cout << "a:" << a << " b:" << b << std::endl; };

func2();

auto func3 = [](int x) ->function<int(int)> { return [=](int y) { return x + y; }; };