make_evaluation_domain.hpp

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//---------------------------------------------------------------------------//
// Copyright (c) 2020-2021 Mikhail Komarov <nemo@nil.foundation>
// Copyright (c) 2020-2021 Nikita Kaskov <nbering@nil.foundation>
//
// MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// The above copyright notice and this permission notice shall be included in all
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//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_MATH_MAKE_EVALUATION_DOMAIN_HPP
#define CRYPTO3_MATH_MAKE_EVALUATION_DOMAIN_HPP
 
#include <nil/crypto3/math/domains/evaluation_domain.hpp>
#include <nil/crypto3/math/domains/arithmetic_sequence_domain.hpp>
#include <nil/crypto3/math/domains/basic_radix2_domain.hpp>
#include <nil/crypto3/math/domains/extended_radix2_domain.hpp>
#include <nil/crypto3/math/domains/geometric_sequence_domain.hpp>
#include <nil/crypto3/math/domains/step_radix2_domain.hpp>
 
#include <nil/crypto3/math/type_traits.hpp>
 
namespace nil {
    namespace crypto3 {
        namespace math {
 
            template<typename FieldType>
            std::shared_ptr<evaluation_domain<FieldType>> make_evaluation_domain(std::size_t m) {
                typedef std::shared_ptr<evaluation_domain<FieldType>> result_type;
 
                const std::size_t big = 1ul << (std::size_t(std::ceil(std::log2(m))) - 1);
                const std::size_t rounded_small = (1ul << std::size_t(std::ceil(std::log2(m - big))));
 
                if (detail::is_basic_radix2_domain<FieldType>(m)) {
                    result_type result;
                    result.reset(new basic_radix2_domain<FieldType>(m));
                    return result;
                }
 
                if (detail::is_extended_radix2_domain<FieldType>(m)) {
                    result_type result;
                    result.reset(new extended_radix2_domain<FieldType>(m));
                    return result;
                }
 
                if (detail::is_step_radix2_domain<FieldType>(m)) {
                    result_type result;
                    result.reset(new step_radix2_domain<FieldType>(m));
                    return result;
                }
 
                if (detail::is_basic_radix2_domain<FieldType>(big + rounded_small)) {
                    result_type result;
                    result.reset(new basic_radix2_domain<FieldType>(big + rounded_small));
                    return result;
                }
 
                if (detail::is_extended_radix2_domain<FieldType>(big + rounded_small)) {
                    result_type result;
                    result.reset(new extended_radix2_domain<FieldType>(big + rounded_small));
                    return result;
                }
 
                if (detail::is_step_radix2_domain<FieldType>(big + rounded_small)) {
                    result_type result;
                    result.reset(new step_radix2_domain<FieldType>(big + rounded_small));
                    return result;
                }
 
                if (detail::is_geometric_sequence_domain<FieldType>(m)) {
                    result_type result;
                    result.reset(new geometric_sequence_domain<FieldType>(m));
                    return result;
                }
 
                if (detail::is_arithmetic_sequence_domain<FieldType>(m)) {
                    result_type result;
                    result.reset(new arithmetic_sequence_domain<FieldType>(m));
                    return result;
                }
 
                return result_type();
            }
        }    // namespace math
    }        // namespace crypto3
}    // namespace nil
 
#endif    // CRYPTO3_MATH_MAKE_EVALUATION_DOMAIN_HPP