tupl.hpp

//  Copyright (c) 2022 Lemurian Labs https://lemurianlabs.com/
//
//  Distributed under the Boost Software License, Version 1.0.
//        http://www.boost.org/LICENSE_1_0.txt
//
//  Repo: https://github.com/Lemurian-Labs/tupl

#ifndef LML_TUPL_HPP
#define LML_TUPL_HPP
/*
  tupl<T...>
  ==========
  tupl is a C++20 tuple type implemented as struct specializations
  for a variadic number of members T... up to 16 as provided.

  DO NOT EDIT the file 'tupl_impl.hpp'.
  The implementation in tupl_impl.hpp is generated by preprocessing
  the file tupl_dev/tupl_impl_pre.hpp; edit this if you need to.
  If more members are needed then follow instructions in tupl_dev
  to generate a file tupl_dev/tupl_impl.hpp
  
  Depends on <concepts> for assignable_from, ranges::swap CPO, etc.
  Depends on <compare> for three-way operator <=> comparisons, etc.
  (MSVC implementation also depends on <cstdint> for uintptr_t.)

  Depends on lml c_array_support project for generic support of array
  member comparison and assignment, alongside other regular types.
*/

#include "array_compare.hpp"
#include "array_assign.hpp"

// same_ish<T,U> concept utility (should be in some util lib or std)
template <typename T, typename U>
concept same_ish = std::same_as<U, std::remove_cvref_t<T>>;

// UNREACHABLE: platform-specific annotation for unreachable code
// till there's a portable or standardized annotation (c.f. P2390 P0627)
#ifdef __GNUC__
#define UNREACHABLE() __builtin_unreachable()
#elif defined(_MSC_VER)
#define UNREACHABLE() __assume(false)
#else
#define UNREACHABLE()
#endif

// The header "tupl_impl.hpp" as provided is limited to 'arity' 16.
// If tupl_dev/tupl_impl.hpp exists then is included instead.
//
#if __has_include("tupl_dev/tupl_impl.hpp")
#include "tupl_dev/tupl_impl.hpp"
#else
#include "tupl_impl.hpp"              
#endif

#undef UNREACHABLE

#endif