unordered_multimap::clear
すべての要素を削除します。
void clear();
解説
このメンバー関数は、unordered_multimap::erase( unordered_multimap::begin(), unordered_multimap::end()) を呼び出します。
使用例
// std_tr1__unordered_map__unordered_multimap_clear.cpp
// compile with: /EHsc
#include <unordered_map>
#include <iostream>
typedef std::unordered_multimap<char, int> Mymap;
int main()
{
Mymap c1;
c1.insert(Mymap::value_type('a', 1));
c1.insert(Mymap::value_type('b', 2));
c1.insert(Mymap::value_type('c', 3));
// display contents " [c 3] [b 2] [a 1]"
for (Mymap::const_iterator it = c1.begin();
it != c1.end(); ++it)
std::cout << " [" << it->first << ", " << it->second << "]";
std::cout << std::endl;
// clear the container and reinspect
c1.clear();
std::cout << "size == " << c1.size() << std::endl;
std::cout << "empty() == " << std::boolalpha << c1.empty() << std::endl;
std::cout << std::endl;
c1.insert(Mymap::value_type('d', 4));
c1.insert(Mymap::value_type('e', 5));
// display contents " [e 5] [d 4]"
for (Mymap::const_iterator it = c1.begin();
it != c1.end(); ++it)
std::cout << " [" << it->first << ", " << it->second << "]";
std::cout << std::endl;
std::cout << "size == " << c1.size() << std::endl;
std::cout << "empty() == " << std::boolalpha << c1.empty() << std::endl;
return (0);
}
必要条件
ヘッダー : <unordered_map>
名前空間: std