C++ STL中的vectorrink_to_fit()函数

vector :: shrink_to_fit()是C++ STL中的内置函数，可减少容器以适应其大小的容量，并破坏超出容量的所有元素。

句法：

vector_name.shrink_to_fit()

参数：该函数不接受任何参数。

返回值：该函数不返回任何内容。

下面的程序说明了上述函数：

// C++ program to illustrate
// the vector::shrink_to_fit() 
#include 
using namespace std;
  
int main()
{
  
    // Initialized vector
    vector v(10);
  
    for (int i = 0; i < 10; i++)
        v[i] = i;
  
    // Initial vector
    cout << "Vector size initially: " << v.size();
  
    cout << "\nVector elements are: ";
    for (int i = 0; i < 10; i++)
        cout << v[i] << " ";
  
    // changes the size of the Vector
    // but does not destroys the elements
    v.resize(5);
  
    cout << "\n\nVector size after resize(5): "
    << v.size();
  
    cout << "\nVector elements after resize(5) are: ";
    for (int i = 0; i < 10; i++)
        cout << v[i] << " ";
  
    // Shrinks to the size
    // till which elements are
    // destroys the elements after 5
    v.shrink_to_fit();
  
    cout << "\n\nVector size after shrink_to_fit(): "
    << v.size();
  
    cout << "\nVector elements after shrink_to_fit() are: ";
    for (int i = 0; i < 10; i++)
        cout << v[i] << " ";
  
    return 0;
}

输出：

Vector size initially: 10
Vector elements are: 0 1 2 3 4 5 6 7 8 9 

Vector size after resize(5): 5
Vector elements after resize(5) are: 0 1 2 3 4 5 6 7 8 9 

Vector size after shrink_to_fit(): 5
Vector elements after shrink_to_fit() are: 0 1 2 3 4 0 127889 0 0 0

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