002_grammar_lamda.cpp

#include <iostream>

int main() {
	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; }; };    　　
	std::function<void(int x)> f_display_42 = [](int x) { print_num(x); };
	f_display_42(44);
}