multimap::empty (STL/CLR)

測試是否沒有項目呈現。

    bool empty();

備註

成員函式會傳回空白的受控制序列的則為 true。它相當於multimap::size (STL/CLR)() == 0。您可以用它來測試是否是空的 multimap。

範例

// cliext_multimap_empty.cpp 
// compile with: /clr 
#include <cliext/map> 
 
typedef cliext::multimap<wchar_t, int> Mymultimap; 
int main() 
    { 
    Mymultimap c1; 
    c1.insert(Mymultimap::make_value(L'a', 1)); 
    c1.insert(Mymultimap::make_value(L'b', 2)); 
    c1.insert(Mymultimap::make_value(L'c', 3)); 
 
// display contents " [a 1] [b 2] [c 3]" 
    for each (Mymultimap::value_type elem in c1) 
        System::Console::Write(" [{0} {1}]", elem->first, elem->second); 
    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/地圖 >

Namespace: cliext

請參閱

參考

multimap (STL/CLR)

multimap::size (STL/CLR)