initializer_list.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Documentation: https://www.etlcpp.com/initializer_list.html
 
Copyright(c) 2022 John Wellbelove
 
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#ifndef ETL_INITIALIZER_LIST_INCLUDED
#define ETL_INITIALIZER_LIST_INCLUDED
 
#include "platform.h"
 
#if ETL_HAS_INITIALIZER_LIST
 
#if (ETL_USING_CPP11 && !defined(ETL_NO_INITIALIZER_LIST))
 
#include <stddef.h>
 
// Use the compiler's std::initializer_list?
#if (ETL_USING_STL && ETL_NOT_USING_STLPORT && !defined(ETL_FORCE_ETL_INITIALIZER_LIST)) || defined(ETL_IN_UNIT_TEST) || defined(ETL_FORCE_STD_INITIALIZER_LIST)
  
    #include <initializer_list>
 
#else
 
// Use the ETL's std::initializer_list
namespace std
{
#if defined(ETL_COMPILER_MICROSOFT) 

  template <typename T>
  class initializer_list
  {
  public:
 
    using value_type      = T;
    using reference       = const T&;
    using const_reference = const T&;
    using size_type       = size_t;
    using iterator        = const T*;
    using const_iterator  = const T*;
 
    //*************************************************************************
    //*************************************************************************
    constexpr initializer_list() ETL_NOEXCEPT 
      : pfirst(nullptr), plast(nullptr)
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    constexpr initializer_list(const T* pfirst_, const T* plast_) ETL_NOEXCEPT
      : pfirst(pfirst_), plast(plast_) 
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    constexpr const T* begin() const ETL_NOEXCEPT 
    { 
      return pfirst; 
    }
 
    //*************************************************************************
    //*************************************************************************
    constexpr const T* end() const ETL_NOEXCEPT 
    { 
      return plast; 
    }
 
    //*************************************************************************
    //*************************************************************************
    constexpr size_t size() const ETL_NOEXCEPT
    {
      return static_cast<size_t>(plast - pfirst);
    }
 
  private:
 
    const T* pfirst;
    const T* plast;
  };
 
  //*************************************************************************
  //*************************************************************************
  template<typename T>
  constexpr const T* begin(initializer_list<T> init) ETL_NOEXCEPT
  {
    return init.begin();
  }
 
  //*************************************************************************
  //*************************************************************************
  template <typename T>
  constexpr const T* end(initializer_list<T> init) ETL_NOEXCEPT
  {
    return init.end();
  }
 
#elif defined(ETL_COMPILER_GCC)  || defined(ETL_COMPILER_CLANG) || defined(ETL_COMPILER_ARM6) || \
      defined(ETL_COMPILER_ARM7) || defined(ETL_COMPILER_IAR)   || defined(ETL_COMPILER_TEXAS_INSTRUMENTS) || \
      defined(ETL_COMPILER_INTEL)

  template<class T>
  class initializer_list
  {
  public:
 
    using value_type      = T;
    using reference       = const T&;
    using const_reference = const T&;
    using size_type       = size_t;
    using iterator        = const T*;
    using const_iterator  = const T*;
 
    //*************************************************************************
    //*************************************************************************
    constexpr initializer_list() ETL_NOEXCEPT 
      : pfirst(nullptr), length(0)
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    constexpr const T* begin() const ETL_NOEXCEPT 
    { 
      return pfirst; 
    }
 
    //*************************************************************************
    //*************************************************************************
    constexpr const T* end() const ETL_NOEXCEPT 
    { 
      return pfirst + length; 
    }
 
    //*************************************************************************
    //*************************************************************************
    constexpr size_t size()  const ETL_NOEXCEPT
    {
      return length;
    }
 
  private:
 
    //*************************************************************************
    //*************************************************************************
    constexpr initializer_list(const T* pfirst_, size_t length_) ETL_NOEXCEPT
      : pfirst(pfirst_)
      , length(length_)
    {
    }
 
    const T* pfirst;
    size_t   length;
  };
 
  //*************************************************************************
  //*************************************************************************
  template<class T>
  constexpr const T* begin(initializer_list<T> init) ETL_NOEXCEPT
  {
    return init.begin();
  }
 
  //*************************************************************************
  //*************************************************************************
  template<class T>
  constexpr const T* end(initializer_list<T> init) ETL_NOEXCEPT
  {
    return init.end();
  }
#else
 
  #error No definition for initializer_list is currently available for your compiler. Visit https://github.com/ETLCPP/etl/issues to request support.
 
#endif // Compiler tests
}
 
#endif // (ETL_USING_STL && ETL_NOT_USING_STLPORT && !defined(ETL_FORCE_ETL_INITIALIZER_LIST)) || defined(ETL_IN_UNIT_TEST) || defined(ETL_FORCE_STD_INITIALIZER_LIST)
#endif // ETL_USING_CPP11 && !defined(ETL_NO_INITIALIZER_LIST)
#endif // ETL_HAS_INITIALIZER_LIST
#endif // ETL_INITIALIZER_LIST_INCLUDED