Bool type

ROOT
1

Hi all,
may be that the answer to my question is simple but I can’t found documentation that can help me!!!
What I want to do is to execute a script that reads a boolean variable!!!
I tried in this way (obviously is just the code of interest and the filename is foo.C):

void foo()
{
bool mybool;
cin >> mybool;
cout << mybool << endl;
}

but it doesn’t work!!!
It sais:

Processing foo.C…
Error: Illegal pointer operation (tovalue) FILE:foo.C LINE:4
*** Interpreter error recovered ***

I tried several methods but the best I reached was to print the output exiting from Root (as if CINT flushes the output buffer while exits)!!!
My question is:
is it possible to use cin and cout for booleans (for other types there are no problems)?
Thanks!
Bye…

2

Hi,

I can not reproduce this problem with the latest version of root.
However the latest version of cint does not properly execute cint>>mybool;
So instead use an int or compile (with ACLiC for example) your macro.

Cheers,
Philippe.

3

Hi,

The problem with cint >> boolvar; not updating the variable will be fix in the next release.

Cheers,
Philippe.

4

And what about cout?
Is there the same problem?
It prints the output (for the bool) but only after “.q”!
Bye…

5

Have you used endofline (endl) ?

cout<<mybool<<endl;

Antonio

6

Yes but this does not solve my problem!!!
Bye…

7

Hi,

I can reproduce any problem with cout and bool:

[quote]bash-2.05b$ root.exe

  •                                     *

  •    W E L C O M E  to  R O O T       *

  •                                     *
  • Version 4.01/05 15 December 2004 *
  •                                     *
  • You are welcome to visit our Web site *
  •      [root.cern.ch](http://root.cern.ch)            *

  •                                     *

Compiled for win32 with thread support.

CINT/ROOT C/C++ Interpreter version 5.15.159, Nov 14 2004
Type ? for help. Commands must be C++ statements.
Enclose multiple statements between { }.
root [0] bool a = true
root [1] cout << a << endl;
1
root [2] .q
[/quote]

Philippe.

8

Thanks!!!