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auto_handle::operator!

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運算子使用auto_handle條件運算式中。

bool operator!();

傳回值

true如果被包裝的物件無效; false否則。

範例

// msl_auto_handle_operator_not.cpp
// compile with: /clr
#include <msclr\auto_handle.h>

using namespace System;
using namespace msclr;

int main() {
   auto_handle<String> s1;
   auto_handle<String> s2 = "something";
   if ( s1) Console::WriteLine( "s1 is valid" );
   if ( !s1 ) Console::WriteLine( "s1 is invalid" );
   if ( s2 ) Console::WriteLine( "s2 is valid" );
   if ( !s2 ) Console::WriteLine( "s2 is invalid" );
   s2.reset();
   if ( s2 ) Console::WriteLine( "s2 is now valid" );
   if ( !s2 ) Console::WriteLine( "s2 is now invalid" );
}

需求

標頭檔 <msclr\auto_handle.h>

Namespace msclr

請參閱

參考

auto_handle::operator bool

其他資源

auto_handle Members