auto_handle::operator bool

The latest version of this topic can be found at auto_handle::operator bool.

Operator for using auto_handle in a conditional expression.

Syntax

operator bool();

Return Value

true if the wrapped object is valid; false otherwise.

Remarks

This operator actually converts to _detail_class::_safe_bool which is safer than bool because it cannot be converted to an integral type.

Example

// msl_auto_handle_operator_bool.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 = "hi";  
   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" );  
}

s1 is invalid  
s2 is valid  
s2 is now invalid

Requirements

Header file <msclr\auto_handle.h>

Namespace msclr

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