vector::empty (STL/CLR)

测试元素不存在。

    bool empty();

备注

成员函数返回 true 一个空序列控制。 它与() == 0等效。vector::size (STL/CLR) 您可用它测试矢量是否为空。

示例

// cliext_vector_empty.cpp 
// compile with: /clr 
#include <cliext/vector> 
 
int main() 
    { 
    cliext::vector<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); 
    } 
 

要求

页眉： <cliext/矢量>

命名空间： cliext

请参见

参考

vector (STL/CLR)

vector::size (STL/CLR)