transform容器拷备

transform容器拷备

class TransForm
{
public:
	int operator()(int val)
	{
		return val;
	}
};

void test04()
{
	vector<int> v; 
	for (int i = 0; i < 10; i++)
		v.push_back(i);

	vector<int> vTar;
	//transform不会给目标容器分配内存，所以需要我们提前分配好内存
	vTar.resize(v.size());
	transform(v.begin(), v.end(), vTar.begin(), TransForm());
	for_each(vTar.begin(), vTar.end(), [](int v) {
		cout << v << endl;
	});
}
//将两个容器搬到一个容器里
class TransForm2
{
public:
	int operator()(int val,int val2)
	{
		return val+val2;
	}
};
void test05()
{
	vector<int> v;
	vector<int> v2;
	for (int i = 0; i < 10; i++)
	{
		v.push_back(i);
		v2.push_back(i + 20);
	}
	vector<int> vtar;
	vtar.resize(v.size());
	transform(v.begin(), v.end(), v2.begin(), vtar.begin(), TransForm2());
	for_each(vtar.begin(), vtar.end(), [](int v) {
		cout << v << endl;
	});
}