scalar_traits.hpp

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/*
 * Copyright © 2025-2026 Akreon LLC
 * SPDX-License-Identifier: Apache-2.0
 */
 
#pragma once
 
#include <complex>
#include <type_traits>
 
namespace linalg {
 
template <typename T>
using remove_cvref_t = std::remove_cvref_t<T>;
 
template <typename T>
struct scalar_traits;
 
template <std::floating_point T>
struct scalar_traits<T> {
  using scalar_type = T;
  using real_type = T;
 
  static constexpr bool is_real = true;
  static constexpr bool is_complex = false;
};
 
template <std::floating_point T>
struct scalar_traits<std::complex<T>> {
  using scalar_type = std::complex<T>;
  using real_type = T;
 
  static constexpr bool is_real = false;
  static constexpr bool is_complex = true;
};
 
template <typename T>
using scalar_traits_t = scalar_traits<remove_cvref_t<T>>;
 
template <typename T>
using scalar_type_t = typename scalar_traits_t<T>::scalar_type;
 
template <typename T>
using real_type_t = typename scalar_traits_t<T>::real_type;
 
template <typename T>
inline constexpr bool is_real_v = scalar_traits_t<T>::is_real;
 
template <typename T>
inline constexpr bool is_complex_v = scalar_traits_t<T>::is_complex;
 
} // namespace linalg