johnmcfarlane

//          Copyright John McFarlane 2018.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file ../LICENSE_1_0.txt or copy at
//          http://www.boost.org/LICENSE_1_0.txt)

// mechanically retrieved, single-header version of CNL library
// https://github.com/johnmcfarlane/cnl

#if ! defined(CNL_COMPLETE_H)

johnmcfarlane

//          Copyright John McFarlane 2018.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file ../LICENSE_1_0.txt or copy at
//          http://www.boost.org/LICENSE_1_0.txt)

// mechanically retrieved, single-header version of CNL library
// https://github.com/johnmcfarlane/cnl

#if ! defined(CNL_COMPLETE_H)

johnmcfarlane

//          Copyright John McFarlane 2018.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file ../LICENSE_1_0.txt or copy at
//          http://www.boost.org/LICENSE_1_0.txt)

// mechanically retrieved, single-header version of CNL library
// https://github.com/johnmcfarlane/cnl

#if ! defined(CNL_COMPLETE_H)

johnmcfarlane

begin(c++): Resources for C++ Beginners

General

• 🌏 The official ISO C++ Get Started! page

Primers

• 🎥 Herb Sutter: (Not Your Father’s) C++
• 🎥 Beginning with C++ by Jens Weller

johnmcfarlane

// code to test warning level of C++ translation unit;
// works with compilers which support `-Wpedantic` flag

// any warning level: 'extern' variable has an initializer [-Wextern-initializer]
// -Wall: "unused variable 'n' [-Wunused-variable]"
// -Wextra: "missing field 'b' initializer [-Wmissing-field-initializers]"
extern struct { int a, b; } n = {sizeof(void(*)(int))};

// -Wpedantic: "variable length arrays are a C99 feature [-Wvla-extension]"
int evoke_pedantic_warning_vla(int n) { int a[n]; return a[3]; }

johnmcfarlane

The Quest for Embedded C++

There are many problems with C++ and the embedded community which mean they don't get along so well. Here are some resources that might help explain the problems and their solutions.

The Problem

• 🎥 C++Now 2018: Michael Caisse “Modern C++ in Embedded Systems”
• 🎥 CppCon 2016: Dan Saks “extern c: Talking to C Programmers about C++” - Really great talk about embedded mindset
• 🎥 ACCU2018: Valentin Galea The Badlands of C++: Professional Game Development - Game developers feel your pain!

johnmcfarlane

// it's probably a good thing that CompilerExplorer's #include<https://> feature isn't recursive!

johnmcfarlane

/*

The MIT License (MIT)

Copyright (c) 2014-2019 Hana Dusíková ([email protected])

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of

johnmcfarlane

//          Copyright John McFarlane 2018.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file ../LICENSE_1_0.txt or copy at
//          http://www.boost.org/LICENSE_1_0.txt)

// mechanically retrieved, single-header version of CNL library
// https://github.com/johnmcfarlane/cnl

#if ! defined(CNL_COMPLETE_H)

johnmcfarlane

#include <functional>
#include <type_traits>
#include <utility>

namespace cnl2 {
  ////////////////////////////////////////////////////////////////////////////////
  // Arithmetic - is a something that supports arithmetic operators
  //
  // As well as a fundamental arithmetic type (unsigned short int, __int128, etc.)
  // a class-based type (a pack<> or a number<> instantiation) although bool is