Atmel CAVR-4 Manual De Usuario

CAVR-4

Part 1. Using the compiler

IAR Systems supports two levels of the C++ language: The industry-standard 

Embedded C++ and IAR Extended Embedded C++. They are described in this 

chapter.

Embedded C++ is a subset of the C++ programming language which is intended for 
embedded systems programming. It was defined by an industry consortium, the 
Embedded C++ Technical Committee. Performance and portability are particularly 
important in embedded systems development, which was considered when defining the 
language.

The following C++ features are supported:

●

Classes, which are user-defined types that incorporate both data structure and 
behavior; the essential feature of inheritance allows data structure and behavior to 
be shared among classes

●

Polymorphism, which means that an operation can behave differently on different 
classes, is provided by virtual functions

●

Overloading of operators and function names, which allows several operators or 
functions with the same name, provided that there is a sufficient difference in their 
argument lists

●

Type-safe memory management using operators 

new

 and 

delete

●

Inline functions, which are indicated as particularly suitable for inline expansion.

C++ features which have been excluded are those that introduce overhead in execution 
time or code size that are beyond the control of the programmer. Also excluded are 
recent additions to the ISO/ANSI C++ standard. This is because they represent potential 
portability problems, due to the fact that few development tools support the standard. 
Embedded C++ thus offers a subset of C++ which is efficient and fully supported by 
existing development tools.

Standard Embedded C++ lacks the following features of C++:

●

Templates 

●

Multiple and virtual inheritance 

●

Exception handling 

●

Runtime type information