C++ vector容器元素替换、拷贝

copy、replace、replace_if、swap 

#include
#include
#include
#include
#include
#include
using namespace std;

//copy 将容器内指定范围的元素拷贝到另一容器中
void test01() {
	vectorv1;
	for (int i = 0; i < 10; i++)
	{
		v1.push_back(i);
	}

	vector target;
	target.resize(v1.size());
	copy(v1.begin(),v1.end(),target.begin());

	for_each(target.begin(), target.end(), [](int val) {cout << val << " "; });
	cout << endl;

	copy(target.begin(), target.end(), ostream_iterator(cout, " "));
	cout << endl;
}


class myReplace {
public:
	bool operator()(int v1) const
	{
		return v1 > 5;
	}
};

//replace将容器内指定范围的旧元素修改为新元素
//replace_if(iterator beg, iterator end, _callback, newvalue)按条件替换
void test02() {
	vector v2;
	for (int i = 1; i <= 10; i++)
	{
		v2.push_back(i);
	}

	replace(v2.begin(),v2.end(),5,500);
	for_each(v2.begin(), v2.end(), [](int val) {cout << val << " "; });
	cout << endl;

	replace_if(v2.begin(),v2.end(),myReplace(),123);
	copy(v2.begin(), v2.end(), ostream_iterator(cout, " "));
	cout << endl;
}


//swap交换
void test03() {
	vectorv3;
	for (int i = 1; i <= 10; i++)
	{
		v3.push_back(i);
	}

	vectorv4(10, 1);

	copy(v3.begin(), v3.end(), ostream_iterator(cout, " "));
	cout << endl;

	copy(v4.begin(), v4.end(), ostream_iterator(cout, " "));
	cout << endl;

	swap(v3,v4);

	copy(v3.begin(), v3.end(), ostream_iterator(cout, " "));
	cout << endl;
	copy(v4.begin(), v4.end(), ostream_iterator(cout, " "));
	cout << endl;
}

int main() {
	test01();
	cout << "--------------------------" << endl;
	test02();
	cout << "--------------------------" << endl;
	test03();
	system("pause");
	return EXIT_SUCCESS;
}

0 1 2 3 4 5 6 7 8 9
0 1 2 3 4 5 6 7 8 9
--------------------------
1 2 3 4 500 6 7 8 9 10
1 2 3 4 123 123 123 123 123 123
--------------------------
1 2 3 4 5 6 7 8 9 10
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
1 2 3 4 5 6 7 8 9 10
请按任意键继续. . .

accumulate、fill 

#include
#include
#include
#include
#include
using namespace std;

//accumulate算法 计算容器元素累计总和
void test01() {
	vectorv1;
	for (int i = 1; i <= 100; i++)
	{
		v1.push_back(i);
	}

	int res = accumulate(v1.begin(), v1.end(), 1000);//初始值1000
	cout << "result: " << res << endl;
}

//fill算法 向容器中添加元素
void test02() {
	vectorv2;
	v2.resize(10);

	fill(v2.begin(), v2.end(), 10);
	
	copy(v2.begin(), v2.end(),ostream_iterator(cout," "));
	cout << endl;
}

int main() {
	test01();
	cout << "------------------------" << endl;
	test02();
	system("pause");
	return EXIT_SUCCESS;
}

result: 6050
------------------------
10 10 10 10 10 10 10 10 10 10
请按任意键继续. . .