types.h

// Copyright (C) 2023-2025 Garth N. Wells and Paul T. Kühner
//
// This file is part of DOLFINx (https://www.fenicsproject.org)
//
// SPDX-License-Identifier:    LGPL-3.0-or-later
 
#pragma once
 
#include <basix/mdspan.hpp>
#include <complex>
#include <concepts>
#include <type_traits>
 
namespace dolfinx
{
 
template <class T>
struct is_custom_scalar : std::false_type
{
};
 
template <class T>
concept scalar = std::floating_point<T>
                 || std::is_same_v<T, std::complex<typename T::value_type>>
                 || is_custom_scalar<T>::value;

template <scalar T, typename = void>
struct scalar_value
{
  typedef T type;
};

template <scalar T>
struct scalar_value<T, std::void_t<typename T::value_type>>
{
  typedef typename T::value_type type;
};

template <scalar T>
using scalar_value_t = typename scalar_value<T>::type;

namespace md = MDSPAN_IMPL_STANDARD_NAMESPACE;
 
} // namespace dolfinx