From config file to data structure

[Mortissus]

I need to read a configuration file and store its options in a data structure. For example:

struct ConfigurationFile{

int option1;
int option2;
double option3;

};

And the configuration file would be:

#begin of file
this is an option = value of this option
another option = some value1, some value2, ...
...
last option = final value
#end of file

What I have done so far is not even good. I have created three structures, one for each kind of option: integer, float or array of floats. Each option has a string that represent it. Three array (one of each kind of option) are created. After reading an option I iterate through the arrays and look for the one that has the string. For example:

struct OpcaoInteira{
    char opcao[50];
    int valor;
};

struct OpcaoReal{
    char opcao[50];
    double valor;
};

struct OpcaoVetor{
    char opcao[50];
    double* valores;
};


OpcaoInteira opInteiras[] = {
    {"numero aneis", 0},
    {"numero aneis concentricos", 0}
};


OpcaoReal opReais[] = {
    {"drmax", 350.e-6},
    {"posicao eletrons", 200.0}
};

OpcaoVetor opVetores[] = {
    {"ra", NULL},
    {"z0", NULL}
};

The problem is not to read the options and values from the file, but to store the options in the ConfigurationFile structure. There are many possible options, and a "if-else" approach would not suffice. Please, if I not explained correctly my problem I would be happy to give more details.

Any help is much appreciated.

[Ancient Dragon]

you might try a union. With this there is only one structure, and you can easily extend it to include other data types. You can also replace that opcao string with a numberic integer that indicates the type of data stored in the union (1 = int, 2 = double, 3 = double array, etc)

struct OpcaoInteira{
    char opcao[50];
    union
    {
         int       ival;
         double dval;
         double* darray;
    }
};

[Mortissus]

Thanks! Everything is ready now!