keep_n_lsb.hpp

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// === AUDIT STATUS ===
// internal:    { status: not started, auditors: [], date: YYYY-MM-DD }
// external_1:  { status: not started, auditors: [], date: YYYY-MM-DD }
// external_2:  { status: not started, auditors: [], date: YYYY-MM-DD }
// =====================
 
#pragma once
#include <cstddef>
 
namespace bb::numeric {
 
template <typename T> inline T keep_n_lsb(T const& input, size_t num_bits)
{
    return num_bits >= sizeof(T) * 8 ? input : input & ((T(1) << num_bits) - 1);
}
 
} // namespace bb::numeric