hash_set::empty (STL/CLR)
測試是否不存在項目。
bool empty();
備註
成員函式傳回 true 表示一個空的控制順序。 它就相當於 hash_set::size (STL/CLR)() == 0。 您會用它來測試 hash_set 是否是空的。
範例
// cliext_hash_set_empty.cpp
// compile with: /clr
#include <cliext/hash_set>
typedef cliext::hash_set<wchar_t> Myhash_set;
int main()
{
Myhash_set c1;
c1.insert(L'a');
c1.insert(L'b');
c1.insert(L'c');
// display initial contents " a b c"
for each (wchar_t elem in c1)
System::Console::Write(" {0}", elem);
System::Console::WriteLine();
System::Console::WriteLine("size() = {0}", c1.size());
System::Console::WriteLine("empty() = {0}", c1.empty());
// clear the container and reinspect
c1.clear();
System::Console::WriteLine("size() = {0}", c1.size());
System::Console::WriteLine("empty() = {0}", c1.empty());
return (0);
}
需求
標頭: <cliext/hash_set>
命名空間: cliext