Why #if 0 ... #endif

[Lost User]

What would be a purpose of enclosing a block of code with #if 0 ... #endif

//#if 0
qDebug() << "Discovered service on"
<< serviceInfo.device().name() << serviceInfo.device().address().toString();
qDebug() << "\tService name:" << serviceInfo.serviceName();
qDebug() << "\tDescription:"
<< serviceInfo.attribute(QBluetoothServiceInfo::ServiceDescription).toString();
qDebug() << "\tProvider:"
<< serviceInfo.attribute(QBluetoothServiceInfo::ServiceProvider).toString();
qDebug() << "\tL2CAP protocol service multiplexer:"
<< serviceInfo.protocolServiceMultiplexer();
qDebug() << "\tRFCOMM server channel:" << serviceInfo.serverChannel();
//#endif

[Mircea Neacsu]

It's a way of commenting out a block of code. In your case, seems like a way to eliminate some debug messages.

Mircea

[Lost User]

BUT does #if 0 evaluates to "true " ? I have been using #ifdef BYPASS #endif where BYPASS is not defined to skip the enclosed block

[CPallini]

Quote:

BUT does #if 0 evaluates to "true " ?

0 evaluates to 'false' see, for instance, the bottom line of this page: If (The C Preprocessor)[^]

Quote:

I have been using #ifdef BYPASS #endif where BYPASS is not defined to skip the enclosed block

The compiler skips the code if BYPASS is not defined (that is, the 'condition' is 'false').

"In testa che avete, Signor di Ceprano?" -- Rigoletto