Atmel CAVR-4 Manual De Usuario

CAVR-4

Part 1. Using the compiler

The namespace feature is only supported in Extended EC++. This means that you can 
use namespaces to partition your code. Note, however, that the library itself is not placed 
in the 

std

 namespace.

The 

std

 namespace is not used in either standard EC++ or in Extended EC++. If you 

have code that refers to symbols in the 

std

 namespace, simply define 

std

 as nothing; 

for example:

#define std  // Nothing here

A pointer to a member function can only contain a default function pointer, or a function 
pointer that can implicitly be casted to a default function pointer. To use a pointer to a 
member function, make sure that all functions that should be pointed to reside in the 
default memory or a memory contained in the default memory.

class X{

public:

  _ _nearfunc void f();

};

void (_ _nearfunc X::*pmf)(void) = &X::f;

If interrupts are enabled and the interrupt functions use class objects that have 
destructors, there may be problems if the program exits either by using 

exit

 or by 

returning from 

main

. If an interrupt occurs after an object has been destroyed, there is 

no guarantee that the program will work properly.

To avoid this, you must override the function 

exit(int)

.

The standard implementation of this function (located in the file 

exit.c

) looks like this:

extern void _exit(int arg);

void exit(int arg)

{

  _exit(arg);

}

_exit(int)

 is responsible for calling the destructors of global class objects before 

ending the program.