8f43927575
examples/ is based on KasperskyLab/knp at 55470ed6 with local changes to the mnist-learn altai/blifat models, cuda-backend CMake and model_loader. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
120 lines
3.2 KiB
C++
120 lines
3.2 KiB
C++
/**
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* @file variant_helpers.h
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* @brief Some useful routines for working with `std::variant`.
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* @kaspersky_support Artiom N.
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* @date 09.08.2023
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* @license Apache 2.0
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* @copyright © 2024 AO Kaspersky Lab
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <stdexcept>
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#include <string>
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#include <variant>
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#include <vector>
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#include <boost/mp11.hpp>
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/**
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* @brief Metaprogramming library namespace.
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*/
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namespace knp::meta
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{
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/**
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* @brief Load elements from one container of all variants to another container that contains a subset of all
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* variants.
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*
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* @tparam SupportedTypes subset of variants.
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* @tparam AllVariants all supported variants.
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* @tparam ToContainer target container.
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*
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* @param from_container source container.
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* @param to_container target container.
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*/
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template <typename SupportedTypes, typename AllVariants, typename ToContainer>
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void load_from_container(const std::vector<AllVariants> &from_container, ToContainer &to_container)
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{
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to_container.clear();
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to_container.reserve(from_container.size());
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for (const auto &p : from_container)
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{
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std::visit(
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[&to_container](auto &arg)
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{
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using T = std::decay_t<decltype(arg)>;
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if constexpr (boost::mp11::mp_find<SupportedTypes, T>{} != boost::mp11::mp_size<SupportedTypes>{})
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{
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to_container.push_back(typename ToContainer::value_type{arg});
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}
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else
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{
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throw std::runtime_error("Type is not supported.");
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}
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},
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p);
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}
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}
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/**
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* @brief Convert from one set of arguments to another.
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*
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* @tparam FromArgs source variant arguments.
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*
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* @note This is is a helper structure. Use `variant_cast` instead.
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*/
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template <class... FromArgs>
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struct variant_cast_proxy
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{
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/**
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* @brief Buffer variable.
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*/
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std::variant<FromArgs...> v;
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/**
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* @brief Cast operator.
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*
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* @tparam ToArgs target variant parameters.
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*
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* @return Same value as source, cast to a different variant.
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*/
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template <class... ToArgs>
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operator std::variant<ToArgs...>() const
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{
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return std::visit([](auto &&arg) -> std::variant<ToArgs...> { return arg; }, v);
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}
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};
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/**
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* @brief Cast from one variant type to another.
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*
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* @tparam Args source variant arguments
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*
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* @param v source value.
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*
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* @return Source value cast to `variant_cast_proxy`. `variant_cast_proxy` then implicitly converts the value to target
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* variant.
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*/
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template <class... Args>
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static auto variant_cast(const std::variant<Args...> &v) -> variant_cast_proxy<Args...>
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{
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return {v};
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}
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} // namespace knp::meta
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