map::size (STL/CLR)
計數項目的數目。
size_type size();
備註
成員函式會傳回受控制序列的長度。您可以用它來判斷目前在受控制序列的項目數目。如果您很在意是否該序列擁有非零值的大小,請參閱map::empty (STL/CLR)()。
範例
// cliext_map_size.cpp
// compile with: /clr
#include <cliext/map>
typedef cliext::map<wchar_t, int> Mymap;
int main()
{
Mymap c1;
c1.insert(Mymap::make_value(L'a', 1));
c1.insert(Mymap::make_value(L'b', 2));
c1.insert(Mymap::make_value(L'c', 3));
// display contents " [a 1] [b 2] [c 3]"
for each (Mymap::value_type elem in c1)
System::Console::Write(" [{0} {1}]", elem->first, elem->second);
System::Console::WriteLine();
// clear the container and reinspect
c1.clear();
System::Console::WriteLine("size() = {0} after clearing", c1.size());
// add elements and clear again
c1.insert(Mymap::make_value(L'd', 4));
c1.insert(Mymap::make_value(L'e', 5));
System::Console::WriteLine("size() = {0} after adding 2", c1.size());
return (0);
}
需求
標頭: < cliext/地圖 >
Namespace: cliext