norm.h

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/*
 * Copyright 2021 MusicScience37 (Kenta Kabashima)
 *
 * 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.
 */
#pragma once
 
#include <cmath>
#include <complex>
 
#include "num_collect/base/concepts/dense_matrix.h"
#include "num_collect/base/concepts/real_scalar.h"
 
namespace num_collect {
inline namespace base {
 
template <concepts::dense_matrix Matrix>
auto norm(const Matrix& matrix) {
    return matrix.norm();
}
 
template <concepts::real_scalar T>
auto norm(const T& val) -> T {
    using std::abs;
    return abs(val);
}
 
template <concepts::real_scalar T>
auto norm(const std::complex<T>& val) -> T {
    return std::abs(val);
}
 
}  // namespace base
}  // namespace num_collect