auto_gcroot::operator!
運算子用於 auto_gcroot 條件運算式。
bool operator!() const;
傳回值
true ,如果包裝的物件無效;否則為 false 。
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>
命名空間 msclr