📅 最后修改于: 2020-10-21 02:25:51 🧑 作者: Mango
Vector是实现动态数组的序列容器类，这意味着在附加元素时大小会自动更改。Vector可将元素存储在连续的内存位置中，并在运行时根据需要分配内存。
数组遵循静态方法，这意味着在运行时不能更改其大小，而vector实现动态数组意味着在添加元素时会自动调整其大小。
考虑向量’v1’。语法为：
vector v1;
让我们看一个简单的例子。
#include
#include
using namespace std;
int main()
{
vector v1;
v1.push_back("javaTpoint ");
v1.push_back("tutorial");
for(vector::iterator itr=v1.begin();itr!=v1.end();++itr)
cout<<*itr;
return 0;
}
输出：
javaTpoint tutorial
在此示例中，矢量类已用于显示字符串。
| Function | Description |
|---|---|
| at() | It provides a reference to an element. |
| back() | It gives a reference to the last element. |
| front() | It gives a reference to the first element. |
| swap() | It exchanges the elements between two vectors. |
| push_back() | It adds a new element at the end. |
| pop_back() | It removes a last element from the vector. |
| empty() | It determines whether the vector is empty or not. |
| insert() | It inserts new element at the specified position. |
| erase() | It deletes the specified element. |
| resize() | It modifies the size of the vector. |
| clear() | It removes all the elements from the vector. |
| size() | It determines a number of elements in the vector. |
| capacity() | It determines the current capacity of the vector. |
| assign() | It assigns new values to the vector. |
| operator=() | It assigns new values to the vector container. |
| operator[]() | It access a specified element. |
| end() | It refers to the past-lats-element in the vector. |
| emplace() | It inserts a new element just before the position pos. |
| emplace_back() | It inserts a new element at the end. |
| rend() | It points the element preceding the first element of the vector. |
| rbegin() | It points the last element of the vector. |
| begin() | It points the first element of the vector. |
| max_size() | It determines the maximum size that vector can hold. |
| cend() | It refers to the past-last-element in the vector. |
| cbegin() | It refers to the first element of the vector. |
| crbegin() | It refers to the last character of the vector. |
| crend() | It refers to the element preceding the first element of the vector. |
| data() | It writes the data of the vector into an array. |
| shrink_to_fit() | It reduces the capacity and makes it equal to the size of the vector. |