C++20 Features:copyright: 2020 Bartlomiej Filipek, https://www.bfilipek.com Last update January 2020New keywords: char8_t, co_await, co_return, co_yield,concept, consteval, constinit, import*, module*, requires* identifiers with a special meaningConcepts Constrains on the template parameters and meaningful compilermessages in case on an error. Can also reduce the compilation time.template concept SignedIntegral = std::is_integral_v &&std::is_signed_v;template /