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// Copyright 2019 Yan Yan
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef PARAMS_GRID_H_
#define PARAMS_GRID_H_
#include <tuple>
#include <vector>
namespace detail {
template <class scalar_t>
int getTotalSize(std::vector<scalar_t> arg) {
return arg.size();
}
template <class scalar_t, class... TArgs>
int getTotalSize(std::vector<scalar_t> arg, std::vector<TArgs>... args) {
return arg.size() * getTotalSize(args...);
}
template <typename scalar_t>
int getSize(std::vector<scalar_t> arg) {
return arg.size();
}
template <int Idx, class TT, class scalar_t>
void assigner(TT &src, std::vector<int> counter, std::vector<scalar_t> &arg) {
std::get<Idx>(src) = arg[counter[Idx]];
}
template <int Idx, class TT, class scalar_t, class... TArgs>
void assigner(TT &src, std::vector<int> counter, std::vector<scalar_t> &arg,
std::vector<TArgs> &... args) {
std::get<Idx>(src) = arg[counter[Idx]];
assigner<Idx + 1>(src, counter, args...);
}
} // namespace detail
template <class... TArgs>
std::vector<std::tuple<TArgs...>> paramsGrid(std::vector<TArgs>... args) {
int length = detail::getTotalSize(args...);
std::vector<int> sizes = {detail::getSize(args)...};
int size = sizes.size();
std::vector<std::tuple<TArgs...>> params(length);
std::vector<int> counter(size);
for (int i = 0; i < length; ++i) {
detail::assigner<0>(params[i], counter, args...);
counter[size - 1] += 1;
for (int c = size - 1; c >= 0; --c) {
if (counter[c] == sizes[c] && c > 0) {
counter[c - 1] += 1;
counter[c] = 0;
}
}
}
return params;
}
#endif
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