list::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list::size (STL/CLR)() == 0。 您可以用它來測試是否清單是空的。

範例

// cliext_list_empty.cpp 
// compile with: /clr 
#include <cliext/list> 
 
int main() 
    { 
    cliext::list<wchar_t> c1; 
    c1.push_back(L'a'); 
    c1.push_back(L'b'); 
    c1.push_back(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/清單 >

Namespace: cliext

請參閱

參考

list (STL/CLR)

list::size (STL/CLR)