largest.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2014 John Wellbelove
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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The above copyright notice and this permission notice shall be included in all
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#if 0
#error THIS HEADER IS A GENERATOR. DO NOT INCLUDE.
#endif
 
//***************************************************************************
// THIS FILE HAS BEEN AUTO GENERATED. DO NOT EDIT THIS FILE.
//***************************************************************************
 
//***************************************************************************
// To generate to header file, run this at the command line.
// Note: You will need Python and COG installed.
//
// cog -d -e -olargest.h -DNTypes=<n> largest_generator.h
// Where <n> is the number of types to support.
//
// e.g.
// To generate handlers for up to 16 types...
// cog -d -e -olargest.h -DNTypes=16 largest_generator.h
//
// See generate.bat
//***************************************************************************
 
#ifndef ETL_LARGEST_INCLUDED
#define ETL_LARGEST_INCLUDED

 
#include "platform.h"
#include "type_traits.h"
#include "smallest.h"
#include "static_assert.h"
 
namespace etl
{
#if ETL_USING_CPP11 && !defined(ETL_LARGEST_TYPE_FORCE_CPP03_IMPLEMENTATION)
  //***************************************************************************
  //***************************************************************************
  template <typename T1, typename... TRest>
  class largest_type
  {
  private:
 
    // Define 'largest_other' as 'largest_type' with all but the first parameter.
    using largest_other = typename largest_type<TRest...>::type;
 
  public:
 
    // Set 'type' to be the largest of the first parameter and any of the others.
    // This is recursive.
    using type = typename etl::conditional<(etl::size_of<T1>::value > etl::size_of<largest_other>::value),  // Boolean
                                            T1,                                                             // TrueType
                                            largest_other>                                                  // FalseType
                                            ::type;                                                         // The largest type of the two.
 
    // The size of the largest type.
    enum
    {
      size = etl::size_of<type>::value
    };
  };
 
  //***************************************************************************
  // Specialisation for one template parameter.
  //***************************************************************************
  template <typename T1>
  class largest_type<T1>
  {
  public:
 
    using type = T1;
 
    enum
    {
      size = etl::size_of<type>::value
    };
  };
 
#if ETL_USING_CPP11
  template <typename... T>
  using largest_type_t = typename largest_type<T...>::type;
#endif
 
#if ETL_USING_CPP17
  template <typename... T>
  constexpr size_t largest_type_v = largest_type<T...>::size;
#endif
 
#else
  //***************************************************************************
  //***************************************************************************
  template <typename T1, typename T2 = void, typename T3 = void, typename T4 = void, 
            typename T5 = void, typename T6 = void, typename T7 = void, typename T8 = void, 
            typename T9 = void, typename T10 = void, typename T11 = void, typename T12 = void, 
            typename T13 = void, typename T14 = void, typename T15 = void, typename T16 = void>
  struct largest_type
  {
    // Define 'largest_other' as 'largest_type' with all but the first parameter. 
    typedef typename largest_type<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16>::type largest_other;
 
    // Set 'type' to be the largest of the first parameter and any of the others.
    // This is recursive.
    typedef typename etl::conditional<(sizeof(T1) > sizeof(largest_other)), // Boolean
                                       T1,                                  // TrueType
                                       largest_other>                       // FalseType
                                       ::type type;                         // The largest type of the two.
 
    // The size of the largest type.
    enum
    {
      size = sizeof(type)
    };
  };
 
  //***************************************************************************
  // Specialisation for one template parameter.
  //***************************************************************************
  template <typename T1>
  struct largest_type<T1,   void, void, void, void, void, void, void, 
                      void, void, void, void, void, void, void, void>
  {
    typedef T1 type;
 
    enum
    {
      size = sizeof(type)
    };
  };
#endif
 
#if ETL_USING_CPP11 && !defined(ETL_LARGEST_ALIGNMENT_FORCE_CPP03_IMPLEMENTATION)
  //***************************************************************************
  //***************************************************************************
  template <typename T1, typename... TRest>
  struct largest_alignment
  {
    // Define 'largest_other' as 'largest_type' with all but the first parameter.
    using largest_other = typename largest_alignment<TRest...>::type;
 
    // Set 'type' to be the largest of the first parameter and any of the others.
    // This is recursive.
    using type = typename etl::conditional<(etl::alignment_of<T1>::value > etl::alignment_of<largest_other>::value), // Boolean
                                            T1,                                                                      // TrueType
                                            largest_other>                                                           // FalseType
                                            ::type;                                                                  // The largest type of the two.
 
    // The largest alignment.
    enum
    {
      value = etl::alignment_of<type>::value
    };
  };
 
  //***************************************************************************
  // Specialisation for one template parameter.
  //***************************************************************************
  template <typename T1>
  struct largest_alignment<T1>
  {
    typedef T1 type;
 
    enum
    {
      value = etl::alignment_of<type>::value
    };
  };
 
#if ETL_USING_CPP17
  template <typename... T>
  inline constexpr size_t largest_alignment_v = largest_alignment<T...>::value;
#endif
 
#else
  //***************************************************************************
  //***************************************************************************
  template <typename T1, typename T2 = void, typename T3 = void, typename T4 = void, 
            typename T5 = void, typename T6 = void, typename T7 = void, typename T8 = void, 
            typename T9 = void, typename T10 = void, typename T11 = void, typename T12 = void, 
            typename T13 = void, typename T14 = void, typename T15 = void, typename T16 = void>
  struct largest_alignment
  {
    // Define 'largest_other' as 'largest_type' with all but the first parameter. 
    typedef typename largest_alignment<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16>::type largest_other;
 
    // Set 'type' to be the largest of the first parameter and any of the others.
    // This is recursive.
    typedef typename etl::conditional<(etl::alignment_of<T1>::value > etl::alignment_of<largest_other>::value), // Boolean
                                       T1,                                                                      // TrueType
                                       largest_other>                                                           // FalseType
                                       ::type type;                                                             // The largest type of the two.
 
    // The largest alignment.
    enum
    {
      value = etl::alignment_of<type>::value
    };
  };
 
  //***************************************************************************
  // Specialisation for one template parameter.
  //***************************************************************************
  template <typename T1>
  struct largest_alignment<T1,   void, void, void, void, void, void, void, 
                           void, void, void, void, void, void, void, void>
  {
    typedef T1 type;
 
    enum
    {
      value = etl::alignment_of<type>::value
    };
  };
#endif
 
  //***************************************************************************
  //***************************************************************************
  template <typename T>
  struct larger_int_type
  {
    ETL_STATIC_ASSERT(etl::is_integral<T>::value, "Must be an integral type");
 
    typedef typename etl::smallest_int_for_bits<etl::integral_limits<typename etl::make_signed<T>::type>::bits + 1>::type type;
  };
 
#if ETL_USING_CPP11
  template <typename T>
  using larger_int_type_t = typename larger_int_type<T>::type;
#endif
 
  //***************************************************************************
  //***************************************************************************
  template <typename T>
  struct larger_uint_type
  {
    ETL_STATIC_ASSERT(etl::is_integral<T>::value, "Must be an integral type");
 
    typedef typename etl::smallest_uint_for_bits<etl::integral_limits<typename etl::make_unsigned<T>::type>::bits + 1>::type type;
  };
 
#if ETL_USING_CPP11
  template <typename T>
  using larger_uint_type_t = typename larger_uint_type<T>::type;
#endif
 
  //***************************************************************************
  //***************************************************************************
  template <typename T, bool IS_SIGNED = etl::is_signed<T>::value>
  struct larger_type;
 
  template <typename T>
  struct larger_type<T, false>
  {
    ETL_STATIC_ASSERT(etl::is_integral<T>::value, "Must be an integral type");
 
    typedef typename etl::smallest_uint_for_bits<etl::integral_limits<T>::bits + 1>::type type;
  };
 
  template <typename T>
  struct larger_type<T, true>
  {
    ETL_STATIC_ASSERT(etl::is_integral<T>::value, "Must be an integral type");
 
    typedef typename etl::smallest_int_for_bits<etl::integral_limits<T>::bits + 1>::type type;
  };
 
#if ETL_USING_CPP11
  template <typename T>
  using larger_type_t = typename larger_type<T>::type;
#endif
 
#if ETL_USING_CPP11 && !defined(ETL_LARGEST_FORCE_CPP03_IMPLEMENTATION)
  //***************************************************************************
  //***************************************************************************
  template <typename... T>
  struct largest
  {
    using type = typename etl::largest_type<T...>::type;
 
    enum
    {
      size      = etl::largest_type<T...>::size,
      alignment = etl::largest_alignment<T...>::value
    };
  };
 
#if ETL_USING_CPP11
    template <typename... T>
    using largest_t = typename largest<T...>::type;
#endif
 
#if ETL_USING_CPP17
    template <typename... T>
    inline constexpr size_t largest_size = largest<T...>::size;
#endif
 
#else
  //***************************************************************************
  //***************************************************************************
  template <typename T1, typename T2 = void, typename T3 = void, typename T4 = void, 
            typename T5 = void, typename T6 = void, typename T7 = void, typename T8 = void, 
            typename T9 = void, typename T10 = void, typename T11 = void, typename T12 = void, 
            typename T13 = void, typename T14 = void, typename T15 = void, typename T16 = void>
  struct largest
  {
    typedef typename etl::largest_type<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16>::type type;
 
    enum
    {
      size      = etl::largest_type<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16>::size,
      alignment = etl::largest_alignment<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16>::value
    };
  };
#endif
}
 
#endif