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Logovod – macro-free allocation-free user-configurable logger front-end for C++

1. Features

logovod features

  1. Three styles of use — with functions, ostream left shifts, format string
  2. Automatic space insertion of functional style
  3. Automatic printing of standard containers, tuples, variants, optional
  4. Compile or run-time priority levels
  5. Compile or run-time sinks
  6. Constrained message length
  7. Support for wide-char streams
  8. Priority levels according to RFC-5424 section-6.2.1

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is_constexpr – a template to test if a function is constexpr

C++ allows declaring functions as constexpr. Such functions could be evaluated at compile time and used, for example in if constexpr(...). However, a non-constexpr function in this context is not allowed.
So, if we want to write a template, accepting a function and using it in either if constexpr(...) or old plain if(...) we need to test whether the function is constexpr, otherwise compile fails as illustrated below:
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setof – an iterable set of strongly typed enumerations

This post suggests an implementation of template class setof which facilitates features of a bit set and a forward-iterable container.

C++ switch with textual cases

C++ does not allow using string literals as case values in a switch statement. In modern C++ this restriction can be worked around with constexpr hash values.
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any_of<c1, …, c2>(v)

This simple C++17 template implements constexpr any_of for matching a value against a list of constants.
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COJSON library for Arduino

COJSON library is also available as Arduino Studio .ZIP library: cojson.zip.

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cojson tutorial for C++17

C++17 has simplified use of template parameters. Instructions, given in this tutorial, describes how to define JSON model with cojson::autos templates.
Note: GCC 7 or higher is required to compile cojson_autos.hpp !

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COJSON Code Generator

cojson v.2 offers an easy start option by using C++ code automatically generated from a JSON sample the user needs to parse or to write.
To use this option just open codegen page, load or copy-&-paste your JSON and copy-&-paste or save the generated C++ code.
And then build your application with cojson sources .

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Enabling C++ for PSoC projects

PSoCProgrammable System on Chip - is an ARM Cortex based family of MCUs (wiki) by Cypress Semiconductor. Cypress offers developers a dedicated IDE - PSoC Creator. Unfortunately, PSoC Creator, (as of version 4.2) does not support C++, despite the underlying GGC Toolchain (arm-none-eabi-gcc-5.4) has C++ support at descent level.

PSoC Creator has an option for migrating to Eclipse CDT IDE, however, migrated projects has no C++ support either

This post explains how to enable C++ for PSoC projects, imported in Eclipse CDT IDE.

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Building OpenSplice DDS for LinkIt Smart 7688 (and other OpenWRT on MIPS)

This post describes how to build OpenSplice DDS for LinkIt Smart 7688 and other OpenWRT targets