https://en.cppreference.com/w/cpp/language/constexpr
https://en.cppreference.com/w/cpp/language/consteval

https://medium.com/@buckaroo.pm/a-tour-of-c-17-if-constexpr-3ea62f62ff65

2023
https://www.cppstories.com/2022/sso-cpp20-checks/

2022
https://www.cppstories.com/2022/const-options-cpp20/
https://www.cppstories.com/2018/03/ifconstexpr/
https://betterprogramming.pub/c-constexpr-what-it-really-is-d6ca81023dcd
    https://nuancesprog.ru/p/15877/

2021
https://habr.com/ru/post/579490/

2020
https://artificial-mind.net/blog/2020/11/14/cpp17-consteval

2019
Vandevoorde - Cpp Constants
    https://www.youtube.com/watch?v=m9tcmTjGeho
https://shafik.github.io/c++/undefined%20behavior/2019/05/11/explporing_undefined_behavior_using_constexpr.html
https://brevzin.github.io/c++/2019/01/15/if-constexpr-isnt-broken/

2018
https://www.hanicka.net/ctre/#/
    https://github.com/hanickadot/compile-time-regular-expressions
    https://github.com/hanickadot/compile-time-regular-expressions/tree/v2
http://www.bfilipek.com/2018/03/ifconstexpr.html
    https://habrahabr.ru/post/351970/
https://www.meetingcpp.com/blog/items/How-if-constexpr-simplifies-your-code-in-Cpp17.html

2017
Deane and Jason Turner - constexpr ALL the Things!
https://www.youtube.com/watch?v=xtf9qkDTrZE
https://www.youtube.com/watch?v=PJwd4JLYJJY
https://github.com/CppCon/CppCon2017/blob/master/Presentations/constexpr%20ALL%20the%20things/constexpr%20ALL%20the%20things%20-%20Jason%20Turner%20and%20Ben%20Deane%20-%20CppCon%202017.pdf

samples
https://github.com/arturbac/stralgo
https://github.com/foonathan/lex
https://github.com/mkitzan/constexpr-sql
    https://old.reddit.com/r/cpp/comments/g5l2nt/constexpr_sql_a_compile_time_sql_library/