?@Colin: I learned that Objective C objects are not complete copies of the class object. In other words, only the data and certain static structures are independent for each instance of a class. The methods are kept in a central location for all objects to use.
Is there any C+ implementation for embedded systems that use this feature?
Scope Example: The Cpp new operator is used to instantiate an object and it allocates resources. The pointer to this object can then be passed outside of the method and the method returns. The compiler does not automatically delete the object when the method returns because a reference to it exists outside of the method context.
? Colin In that example of page 15, if we want to call the fun1 function from some place in our code, do we call it using "astruct.fun1(arg)"? And must the fun1() functionbe declared public in order for it to be called from all other places in the code?
Using the constructor and destructor for allocation and deallocation respectively is still not a guarantee for avoiding memory leaks. The destructor is only called when the compiler can determine if the object has gone out of scope. There are numerous cases where the compiler cannot guarantee the object is out of scope and therefore does not call the destructor leaving it up to the coder's expertise to call the destructor using the delete operator.
C+ compiler usually emits code for parameterless constructor if no other constructors are present. Otherwise, the parameterless constructor needs to be explicitly defined. The C compiler also emits copy constructor and assignment operator?
? Colin What kind of code is contained in the constructor and destructor? Does the programmer write the bodies of the constructor and destructor functions? (Or are they somehow provided by the commpiler?)
@cpu: OK mystruct is the type of the class - struct mystruct. The 2 member functions have variations of that name to indicate that they are constructor and destructor. At the bottom I declare an instance of mystruct called astruct. Any clearer?
@cpu The mystruct() and ~mystruct() elements are the constructor and destructor functions for the struct. A struct is the same as a class in C+ except for the default member access control (public vs private).
? Colin: One observable obstacle to using OO tools such as C+ seems to be the structure of objects, i.e. defining correct parent objects that child objects can be derived from and inherit useful traits. Are you going to be discussion OO in this lecture series relative to object selection?
?Colin, on slide 15, please explain again your point of using mystruct as a struct declaration, and the same name mystruct as a function. What are you trying to show there? And what is the operation peformed by ~mystruct()?
@JimmyD Try one of the Atmel kits to get started. The ARM kits will use code from Atmel Studio. TI has Code Composer -- again the TI ARM TIVA Launch Pad is cheap and the compiler free -- in all cases the compilers run on the PC.
@JimmyD look to any chip manufacturer, ANY, they all sell compilers or have partners with compiler makers. These are called "cross compilers" because they run on a PC but make code for an embeded chip.
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@LEE337 -- for TI I use their compiler Code Composer Studio. For ST I have used IAR and COOCOX (you can use CPP with COOCOX) For Atmel I use their latest Atmel Studio product. I have also used "raw" gcc under mingw and cygwin etc.
@bitbanger: I use C+ for all my projects where it is possible. You do not have to call in the unwieldy libraries unless necessary. However, those libraries used as needed can provide a lot of functionality that saves a lot of coding.
I use TI and Atmel mostly -- but am starting with ST as well.
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Noting that we now live in an era of “confusion and ill-conceived stuff,” Ammunition design studio founder Robert Brunner, speaking at Gigaom Roadmap, said that by adding connectivity to everything and its mother, we aren't necessarily doing ourselves any favors, with many ‘things’ just fine in their unconnected state.
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