accessors.hpp

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// Copyright (c) 2019--present, The Simons Foundation
// This file is part of TRIQS/nda and is licensed under the Apache License, Version 2.0.
// SPDX-License-Identifier: Apache-2.0
// See LICENSE in the root of this distribution for details.

 
#pragma once
 
#include "./macros.hpp"
 
#include <cstddef>
 
namespace nda {


  struct default_accessor {
    template <typename T>
    struct accessor {
      using element_type = T;

      using pointer = T *;

      using reference = T &;

      FORCEINLINE static reference access(pointer p, std::ptrdiff_t i) noexcept {
        EXPECTS(p != nullptr);
        return p[i];
      }

      FORCEINLINE static T *offset(pointer p, std::ptrdiff_t i) noexcept { return p + i; }
    };
  };

  struct no_alias_accessor {
    template <typename T>
    struct accessor {
      using element_type = T;

      using pointer = T *__restrict;

      using reference = T &;

      FORCEINLINE static reference access(pointer p, std::ptrdiff_t i) noexcept { return p[i]; }

      FORCEINLINE static T *offset(pointer p, std::ptrdiff_t i) noexcept { return p + i; }
    };
  };

 
} // namespace nda