C++ 向量::shrink_to_fit() 函数
vector::shrink_to_fit() 是 "vector" header 的库函数,用于减少容量以适应大小。详细参考示例了解。
这可能会导致重新分配,但元素不会改变。
注意:要使用矢量,请包括<vector>
标题。
vector::shrink_to_fit() 函数的语法
vector::shrink_to_fit();
参数: none
——它什么都不接受。
返回值: void
——它什么都不返回。
例:
Input: //capacity is initialized to be 100 vector<int> arr(50); arr.capacity() =50 Resize: //doesn't change capacity though arr.resize(10); arr.capacity() =50 shrink_to_fit: //changes capacity as per resize, //thus this practically reduced the capacity arr.shrink_to_fit(); arr.capacity() =10
演示vector::shrink_to_fit()函数示例的C++程序
#include <iostream>
#include <vector>
using namespace std;
int main()
{
vector<int> arr(50); //capacity is initialized to be 100
cout << "...capacity of the vector:" << arr.capacity() << "...\n";
arr.resize(10); //doesn't change capacity though
cout << "...After resizing...\n";
cout << "capacity of the vector:" << arr.capacity() << "\n";
arr.shrink_to_fit(); //changes capacity as per resized vector
cout << "...After using shrink_to_fit...\n";
cout << "capacity of the vector:" << arr.capacity() << "\n";
return 0;
}
输出
...capacity of the vector:50... ...After resizing... capacity of the vector:50 ...After using shrink_to_fit... capacity of the vector:10
参考:C++ 向量::shrink_to_fit()
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注:本文由纯净天空筛选整理自 vector::shrink_to_fit() function with example in C++ STL。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。