auto_gcroot::operator!

運算子使用auto_gcroot條件運算式中。

bool operator!() const;

傳回值

true如果被包裝的物件無效; false否則。

範例

// msl_auto_gcroot_operator_not.cpp
// compile with: /clr
#include <msclr\auto_gcroot.h>

using namespace System;
using namespace msclr;

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

需求

標頭檔 <msclr\auto_gcroot.h>

Namespace msclr

請參閱

參考

auto_gcroot::operator bool

其他資源

auto_gcroot Members