[deal.II] Issue with parameter handlers

[Jason Sheldon]

Hello everyone,

I've come across the need to read specific values from a parameter file
before I know which values I will be reading later.  I can get the code to
compile and run, but it shoots out a lot of warnings saying parameters have
not been declared.

I've mocked up a small example of this. (attached)  I was wondering if there
was a way to prevent these warnings from occurring, or a different way I
should be calling the parameter file to avoid the issue.
-- 
-Jason Sheldon

#include <base/parsed_function.h>
#include <base/logstream.h>

using namespace dealii;
using namespace dealii::Functions;

int main (int argc, char* argv[]) 
{
    std::string         prm_file_name;
    std::string         system_type;
    bool                prm_foo;
    bool                prm_bar;
    ParameterHandler    prm;

    if(argc < 2) {
        deallog << "No Parameter File Specified!!!" << std::endl;
        deallog << "Using Default Filename: Parameters.prm" << std::endl;
        prm_file_name = "parameters.prm";
    } else {
        prm_file_name = argv[1];
        dealii::deallog << "Using Specified Parameter File: "
            << prm_file_name 
            << std::endl;
    }

    prm.declare_entry ("System Type","Error", Patterns::Anything(),"The type of system being solved: eg. foo, bar, etc.");
    prm.read_input(prm_file_name);
    system_type = prm.get("System Type");

    if (system_type == "foo")
    {
        prm.declare_entry ("prm foo","false", Patterns::Bool(),"Some Boolean: true or false");
        prm.read_input(prm_file_name);
        prm_foo = prm.get_bool("prm foo");
        deallog<<"Code reached foo case and properly set prm foo to "<<prm_foo<<"."<<std::endl;
    }

    else if (system_type == "bar")
    {
        prm.declare_entry ("prm bar","false", Patterns::Bool(),"Some other Boolean: true or false");
        prm.read_input(prm_file_name);
        prm_bar = prm.get_bool("prm bar");
        deallog<<"Code reached bar case and properly set prm bar to "<<prm_bar<<"."<<std::endl;
    }

    else //add more as relevant
    {
        std::cout <<"Error: You did not specify a valid system type."<<std::endl;
        std::exit(EXIT_FAILURE);
    }

    deallog<<"Output to show code successfully reached the end."<<std::endl;

    return 0;
}

PRMTest.prm
Description: Binary data

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