1. WIKI教程
2. C ++标准库
3. vector::shrink_to_fit

vector::shrink_to_fit

描述 (Description)

C ++函数std::vector::shrink_to_fit()请求容器减小其容量以适应其大小。

声明 (Declaration)

以下是std :: vector :: shrink_to_fit（）函数形式std :: vector标头的声明。

C++98

void shrink_to_fit();

参数 (Parameters)

没有

返回值

没有

例子 (Example)

以下示例显示了std :: vector :: shrink_to_fit（）函数的用法。

#include <iostream>
#include <vector>
using namespace std;
int main(void) {
   vector<int> v(128);
   cout << "Initial capacity = " << v.capacity() << endl;
   v.resize(25);
   cout << "Capacity after resize = " << v.capacity() << endl;
   v.shrink_to_fit();
   cout << "Capacity after shrink_to_fit = " << v.capacity() << endl;
   return 0;
}

让我们编译并运行上面的程序，这将产生以下结果 -

Initial capacity = 128
Capacity after resize = 128
Capacity after shrink_to_fit = 25