multiset :: clear()函数是C++ STL中的内置函数,可从多集容器中删除所有元素。移除后多容器的最终大小为0。
句法:
multiset_name.clear()
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multiset :: clear()函数:
程序1:
C++
// C++ program to demonstrate the
// multiset::clear() function
#include
using namespace std;
int main()
{
int arr[] = { 15, 10, 15, 11, 10 };
// initializes the set from an array
multiset s(arr, arr + 5);
// prints all elements in set
cout << "The elements in multiset are: ";
for (auto it = s.begin(); it != s.end(); it++)
cout << *it << " ";
cout << "\nThe size after clear() is: ";
// erases all elements
s.clear();
cout << s.size();
return 0;
}
C++
// C++ program to demonstrate the
// multiset::clear() function
#include
using namespace std;
int main()
{
int arr[] = { 15, 10, 15, 11, 10, 18, 18, 20, 20 };
// initializes the set from an array
multiset s(arr, arr + 9);
// prints all elements in set
cout << "The elements in multiset are: ";
for (auto it = s.begin(); it != s.end(); it++)
cout << *it << " ";
cout << "\nThe size after clear() is: ";
// erases all elements
s.clear();
cout << s.size();
return 0;
}
输出:
The elements in multiset are: 10 10 11 15 15
The size after clear() is: 0
程式2:
C++
// C++ program to demonstrate the
// multiset::clear() function
#include
using namespace std;
int main()
{
int arr[] = { 15, 10, 15, 11, 10, 18, 18, 20, 20 };
// initializes the set from an array
multiset s(arr, arr + 9);
// prints all elements in set
cout << "The elements in multiset are: ";
for (auto it = s.begin(); it != s.end(); it++)
cout << *it << " ";
cout << "\nThe size after clear() is: ";
// erases all elements
s.clear();
cout << s.size();
return 0;
}
输出:
The elements in multiset are: 10 10 11 15 15 18 18 20 20
The size after clear() is: 0
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