How can C++ make it possible to use dynamic container classes even in embedded s

Question

How can C++ make it possible to use dynamic container classes even in embedded systems?

Background info:

I've been working with PIC (C) and AVR (C++) processors and at the moment (PIC C) I'm trying to send a text (with undefined length) to a method that only sends this string with a HTTP POST (so it has to know the length beforehand).

Problem & question:

On C++ this could easily be achieved with a container class/dynamic array. Though, when using C, I (guess) I'm continiously overwriting memory addresses (When I use a pointer and then change the length)?

How does C++ (effici

Explanation / Answer

C++ can do it the same way C does. All C++ gives you is easier-to-use containers that wrap much of the low-level detail.

For example, a string class can (and does) hold a block of memory on the stack for short strings, only allocating a heap buffer for larger ones. This buffer is exactly like a C string buffer, if the string resizes, the string class will resize it in the same way a C programmer would by allocating a new buffer and copying the old data into it, except that possibly the string class will over-allocate the buffer size to allow for future appending to the string. Some string classes will count the length of the string using strlen, others will store the length as a member variable that it keeps up to date.

Arrays are managed in the same way, but there are specialised containers that give you things like linked lists.

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.