concepts.hpp

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// Copyright (c) 2020-2021 Simons Foundation
//
// 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.txt
//
// 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.
//
// Authors: Olivier Parcollet, Nils Wentzell
 
/**
 * @file
 * @brief Provides missing concepts for older compiler versions.
 */
 
#pragma once
 
#include <version>
 
// libcpp below 13 has incomplete <concepts>
#if defined(_LIBCPP_VERSION) and _LIBCPP_VERSION < 13000
 
#include <type_traits>
 
namespace std {
 
  template <class T>
  concept integral = std::is_integral_v<T>;
 
} // namespace std
 
#endif