std::cout << "Default-constructed capacity is " << v.capacity() << 'n';
v.resize(100);
std::cout << "Capacity of a 100-element vector is " << v.capacity() << 'n';
v.clear();
std::cout << "Capacity after clear() is " << v.capacity() << 'n';
v.shrink_to_fit();
std::cout << "Capacity after shrink_to_fit() is " << v.capacity() << 'n';
}
结果：
复制代码Default-constructed capacity is 0
Capacity of a 100-element vector is 100
Capacity after clear() is 100
Capacity after shrink_to_fit() is 0
