code_snippets

Real-Time-C++ - Code Snippets

These are the code snippets from the chapters of the book C.M. Kormanyos, Real-Time C++: Efficient Object-Oriented and Template Microcontroller Programming, Fourth Edition (Springer, Heidelberg, 2021) ISBN 9783662629956.

Summary of the Code Snippets

The code snippets are organized according to chapter and section.

Each code snippet in intended to be a complete standalone C++ project that compiles and runs on a PC host using the host's compiler system such as MSVC on Win* or GCC on *nix.

The code snippets correspond to individual code samples in the book but extend these in rudimentary ways to include a main subroutine and usually some sensible short messages to the output console.

Consider, for instance, the code snippet chapter03_11-001_array.cpp.

// chapter03_11-001_array.cpp

#include <algorithm>
#include <array>
#include <cstddef>
#include <cstdint>
#include <iostream>
#include <iomanip>
#include <iterator>

using login_key_array_type = std::array<std::uint8_t, static_cast<std::size_t>(UINT8_C(3))>;

// A login key stored in an std::array.

constexpr auto login_key =
  login_key_array_type
  {
    static_cast<std::uint8_t>(UINT8_C(0x01)),
    static_cast<std::uint8_t>(UINT8_C(0x02)),
    static_cast<std::uint8_t>(UINT8_C(0x03))
  };

auto main() -> int
{
  const auto flg = std::cout.flags();

  std::cout.unsetf(std::ios::dec);
  std::cout.setf(std::ios::hex);
  std::cout.setf(std::ios::showbase);

  std::cout << "login_key is ";
  std::copy(login_key.cbegin(), login_key.cend(), std::ostream_iterator<unsigned int>(std::cout, ","));
  std::cout << std::endl;

  std::cout.flags(flg);
}

This code snippet portrays simple use of std::array. An array named login_key is created and initialized with the data bytes 1,2,3. The bytes are printed to the output console.

The expected output message text is

login_key is 0x1,0x2,0x3,

Testing and CI

The code snippets have been tested locally on GCC, clang and MSVC. CI for the code snippets runs with GCC and clang on *nix using (at the moment) build-only.

Try it at godbolt

Use this short link to godbolt in order to further explore this program.

In the afore-mentioned link, the file chapter03_11-001_array.cpp is, in fact, compiled with a modern GCC host-compiler.

This is an example of compiling, linking and running on a PC host.

To clearly reiterate: The file is actually compiled, linked and also executed. This provides keen insight into both this particular code-snippet as well as potential code and compiler exploration in your own domain(s).

In todays fast-paced, modern coding world, it is fun, educational, exciting and effective to try out and share code-snippets at godbolt