How To Use pseudoPODs:

 

The preceding section showed an example of how to use pseudoPODs for integers.  This section shows the details of using pseudoPODs for different data types, including longs, pointers, arrays, etc.

 

Integer pseudoPODs:

 

ppod(fred_c, int, name); // create the pseudoPOD

 

name.ep=this; // place in constructor()

                        // of class fred_c

 

int get_name () { // handle reads,

                   // e.g.   i = fred.name;

     // add extra code here if needed.

     return (name_value);

}

int set_name(int in) { // handle writes,

                        // e.g.   fred.name = 35;

     // add extra code here if needed.

     name_value = in;

     return (name_value);

}

 

Long pseudoPODs:

 

same as for integer, but for "int" substitute "long".

 

Other Non-Pointer Non-Array Types of pseudoPODs:

 

same as for integer, but for "int" substitute one of "unsigned int", "unsigned long", "short", "unsigned short", "char", "unsigned char", "bool", "float", "double" or "long double".

ppod() fails for 3 word data types, e.g. "unsigned long int" or "unsigned short int".  Use instead their 2 word equivalents "unsigned long" or "unsigned short".

 

Integer Pointer pseudoPODs:

 

ppod_p(fred_c, int*, name);    // create the pseudoPOD

 

name.ep=this; // place in constructor()

                             // of class fred_c

 

int *get_name () { // handle reads,

                        // e.g.   i = fred.name;

     // add extra code here if needed.

     return (name_value);

}

int *set_name(int *in) { // handle writes,

                        // e.g. fred.name = 35;

     // add extra code here if needed.

     name_value = in;

     return (name_value);

}

 

Other Pointer pseudoPODs:

 

same as for integer, but for "int*" substitute one of "unsigned int*", "unsigned long*", "short*", "unsigned short*", "char*", "unsigned char*", "bool*", "float*", "double*" or "long double*".

The pseudoPOD pointers in this article are simple ones - to explore various ways of making pointers more capable and more complex, google "smart pointers" or "auto_pointer" on the web, and see Scott Meyers' books on Effective C++.

 

Arrays of Integer pseudoPODs:

 

ppod_array(fred_c, int, name, podlen); // create the

     // pseudoPOD, an array of [podlen] elements.

     // The ppod_array() code creates

     // const static int name_array_len = podlen;

 

// place in constructor() of class fred_c

for (int i=0; i<name_array_len; ++i) {

     name[i].ep=this;

};

 

int get_name (int index) { // handle reads,

                        // e.g. i=fred.name[7];

     if ((index < 0) || (index >= name_array_len)) {

          cout << "ERROR: get_name() - array index ["

              << index << "] out of bounds\n";

          std::cin.get(); exit(1); // wait

                   // for keystroke, then exit

     }

     // add extra code here if needed.

     return (name_value[index]);

}

int set_name(int index, int in) { // handle writes,

                        // e.g. fred.name[i] = 35;

     // check for array index out of bounds.

     if ((index < 0) || (index >= name_array_len)) {

          cout << "ERROR: set_name() - array index ["

              << index << "] out of bounds\n";

          std::cin.get(); exit(1); // wait

                   // for keystroke, then exit

     }

     // add extra code here if needed.

     name_value[index] = in;

     return (name_value[index]);

}

 

Arrays of Other Non-Pointer pseudoPODs:

 

same as for integer, but for "int" substitute one of "unsigned int", "unsigned long", "short", "unsigned short", "char", "unsigned char", "bool", "float", "double" or "long double".

 

Arrays of Integer Pointer pseudoPODs:

 

ppod_array_p(fred_c, int*, name, podlen);  // create

                                  // pseudoPOD array

 

// place in constructor() of class fred_c

for (int i=0; i<name_array_len; ++i) {

     name[i].ep=this;

};

 

int *get_name (int index) { // handle reads,

                        // e.g. ip = fred.name[7];

     if ((index < 0) || (index >= name_array_len)) {

          cout << "ERROR: *get_name() - array index ["

              << index << "] out of bounds\n";

          std::cin.get(); exit(1); // wait

                        // for keystroke, then exit

     }

     // add extra code here if needed.

     return (name_value[index]);

}

int *set_name(int index, int *in) { // handle

              // writes, e.g. fred.name[i] = 35;

     // check for array index out of bounds.

     if ((index < 0) || (index >= name_array_len)) {

          cout << "ERROR: *set_name() - array index ["

              << index << "] out of bounds\n";

          std::cin.get(); exit(1); // wait

                   // for keystroke, then exit

     }

     // add extra code here if needed.

     name_value[index] = in;

     return (name_value[index]);

}

 

Arrays of Other Pointer pseudoPODs:

 

same as for integer, but for "int*" or "int *" substitute one of "unsigned int*", "unsigned long*", "short*", "unsigned short*", "char*", "unsigned char*", "bool*", "float*", "double*" or "long double*".

 

Read Only or Write Only pseudoPODs:

 

same as before, but add "_ro" or "_wo" to the ppod() call, so that: