ParameterHandler.declare_entry leads to a crash if entry="value"

[Denis Davydov]

Hi everyone,

I just came across a very strange behavior of 

   prm.declare_entry("value", "1e-6",

                    dealii::Patterns::Double(),

                 "bla-bla-bla");

When I try to output parameters via

   prm.print_parameters (std::cout, dealii::ParameterHandler::Text);

the library crashes with:

    # Listing of Parameters

    # ---------------------

    terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::property_tree::ptree_bad_path> >'

      what():  No such node (documentation)

    Abort trap: 6

That does not happen if the entry is something else but "value". 

I don't know if this is a problem with my installation or a bug somewhere in "print_parameters". 

I must admit i have not checked this behavior on a minimal (toy-like) example, but i assume it will be there.

Kind regards,

Denis.

[Timo Heister]

Hi Denis,

I can not reproduce that problem here. Can you try to make a small
example, please? Do you use something like
FunctionParser::declare_paramters() or something?

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[Denis Davydov]

Hi Timo,

I don't parse any functions yet, just constants. 

please find attached a striped down version of the code which crashes. 

Kind regards,

Denis.

[Matthias Maier]

There is indeed a bug. I can reproduce with:


#include <deal.II/base/parameter_handler.h>

int main()
{
dealii::ParameterHandler foo;
foo.enter_subsection("bar");
foo.declare_entry("value", "1.0", dealii::Patterns::Double(), "");
foo.leave_subsection();
foo.read_input("foo.cfg");
}


Output:

ParameterHandler::read_input: could not open file <foo.cfg> for reading.
Trying to make file <foo.cfg> with default values for you.

terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::property_tree::ptree_bad_path> >'
what(): No such node (documentation)

zsh: abort ./test

[Matthias Maier]

Hi Denis,

Am 31. Mar 2013, 11:44 schrieb Denis Davydov <davy...@gmail.com>:

> Hi Timo,

>
> please find attached a striped down version of the code which crashes.
>

Can you reduce the example to 20-50 lines of code?
I'm unable to compile the current version.

Best,
Matthias

[Matthias Maier]

Fixed in r29123. Thanks for reporting!

Best,
Matthias

[Wolfgang Bangerth]

On 03/31/2013 03:40 PM, Matthias Maier wrote:
> Fixed in r29123. Thanks for reporting!

Thanks for taking a look at this. I think the patch is strictly correct but
I've actually fixed it in a different way nonetheless -- "value" is simply a
special name in the hierarchy (see the internal documentation of the
ParameterHandler class). I'm now mangling it.

Denis -- thanks for reporting the problem!

Best
Wolfgang

--
------------------------------------------------------------------------
Wolfgang Bangerth email: bang...@math.tamu.edu
www: http://www.math.tamu.edu/~bangerth/

[Denis Davydov]

Hi Matthias and Wolfgang,

I'm glad the source of the problem was found and everything is fixed.

Kind regards,

Denis.