Specifications

CAVR-4

C++ and memory types

AVR® IAR C/C++ Compiler

Reference Guide

In short:

C++ and memory types

A C++ class object is placed in one memory type, in the same way as for normal C

structures. However, the class members that are considered to be part of the object are

the non-static member variables. The static member variables can be placed individually

in any kind of memory.

Remember, in C++ there is only one instance of each static member variable, regardless

of the number of class objects.

Also note that for non-static member functions—unless class memory is used, see

Classes, page 111—the

this pointer will be of the default data pointer type. This means

that it must be possible to convert a pointer to the object to the default pointer type. The

restrictions that apply to the default pointer type also apply to the

this pointer.

int __flash * e;

A pointer stored in default memory. The pointer

points to an integer in flash memory.

int __flash * __eeprom f;

A pointer stored in eeprom memory pointing to

an integer stored in flash memory.

int __eeprom * myFunction(

int __flash *);

A declaration of a function that takes a

parameter which is a pointer to an integer stored

in flash memory. The function returns a pointer

to an integer stored in eeprom memory.

int

The basic type is an integer.

int __flash

The integer is stored in flash memory.

int __flash *

This is a pointer to the integer.

int __flash * __eeprom

The pointer is stored in eeprom memory.