sutton050

When I say not working, I do not mean the function does not work, of course it works.  What I mean is that left to it's on devices the GCC compiler can actually chose to not perform a memset in certain circumstances, you can read more detail about this in the official bug list . So, what's going on?  Well, I have a piece of code which uses a common buffer, each function locks a mutex (std::lock_guard), fills out the buffer and then transmits over USB to target devices, crucially I then want to clear the common buffer. The purpose of this architecture is to keep sensitive information being transmitted through the buffer present for as little time as possible (i.e. the time between filling out and transmit, ~35ms) rather than filling out, transmitting and leaving the data in the buffer; as the time between calls may be anything up to 5 seconds, plenty of time for someone to halt the program and inspect memory dispositions. In pseudo code therefore our sequence looks something li...

What is an ignored qualifier?  Well, in a class, lets have a student class: #include <string> class Student {     public:         const std::string Name;     private:         bool m_Present;     public:         Student(const std::string& p_Name)             :             Name(p_Name),             m_Present         {         }                 void SetPresent() { m_Present = true; }         void SetAbsent() { m_Present = false; } }; Now, we may want to access the present flag, therefore provide a function to do so:     bool Present() const { return m_Present } This function is telling the user of our class quite a bit, it tells them that the return type is boolean and that the calling...

I may have wrote this post, but I'm just being lazy... Read on. I've made other Boost videos, and other codeblocks videos, and I've always assumed that the user at the other end was well aware of how to compile & build code. However, it seems there are lots of users whom are not aware of how you actual create a program from source code, at least not with C++. So I'm going to show you the absolutely most  wrong basic way of creating and using a makefile to perform a build... The first step of C++ program creation, is that trivial matter of creating the source code, easy right?... Yep, so lets skip that step, and go to when its once  and we want to pass the code through a compiler, the compiler turns the source not into a program, but into an intermediary format called an object file or object code. The compiler then leaves the process and another program takes over, this second program is known as the Linker, and it takes the object code and links it with all the sy...