c++11之tuple

以下是小可关于tuple的理解有不对之处希望大家指正


tuple简单测试

tuple和struct的功能类似,它是以std::get<0>(pos)方式取值它不限变量个数
测试代码

#include 
#include 

int main()
{
	std::cout << "------------tuple test ----------\n";
	std::tuple pos;
	pos = std::make_tuple(100, 110, 120);
	std::cout << "tuple_size " << std::tuple_size::value << "\n";
	std::cout << std::get<0>(pos) << " " << std::get<1>(pos) << " " << std::get<2>(pos) << " \n";

	std::cout << "------------tuple vector test ----------\n";
	std::vector> tupVec;
	typedef decltype(std::vector>::value_type()) tupVecType;

	for (int i = 0; i < 3; i++)
		tupVec.push_back(tupVecType(i * 1, i * 10, i * 100));

	std::cout << "------------for test ----------\n";
	for (int i = 0; i < 3; i++)
		std::cout << std::get<0>(tupVec[i]) << " " << std::get<1>(tupVec[i]) << " " << std::get<2>(tupVec[i]) << "\n";

	std::cout << "------------std::for_each test ----------\n";
	std::for_each(tupVec.begin(), tupVec.end(), [&](tupVecType var) {
		std::cout << std::get<0>(var) <<" "<<  std::get<1>(var) << " " << std::get<2>(var) << "\n";
	});

	std::cout << "------------new for test ----------\n";
	for (tupVecType var:tupVec)
	{
		std::cout << std::get<0>(var) << " " << std::get<1>(var) << " " << std::get<2>(var) << "\n";
	}
	std::cout << "------------tuple map test ----------\n";
	std::map> tupMap;

	for (int i = 0; i < 3; i++)
		tupMap.insert(std::pair>(std::string("test")+std::to_string(i), tupVecType(i * 1, i * 10, i * 100)));
	
	for (auto& var: tupMap)
	{
		std::cout <(var.second) << " " << std::get<1>(var.second) << " " << std::get<2>(var.second) << "\n";
	}

	system("pause");
	return 0;
}

结果如下

------------tuple test ----------
tuple_size 3
100 110 120
------------tuple vector test ----------
------------for test ----------
0 0 0
1 10 100
2 20 200
------------std::for_each test ----------
0 0 0
1 10 100
2 20 200
------------new for test ----------
0 0 0
1 10 100
2 20 200
------------tuple map test ----------
test0 0 0 0
test1 1 10 100
test2 2 20 200
请按任意键继续. .

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