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Matthias Männich authored
std::{begin,end} are part of C++11, std::{cbegin,cend} are part of C++14 and an standard compliant implementation has been introduced within the 'cm' namespace: cm::{cbegin,cend}. std::size is only part of C++17, hence exposing a compliant implementation within namespace cm (cm::size). where possible, the standard implementations are reused.
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