string_view.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2017 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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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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******************************************************************************/
 
#ifndef ETL_STRING_VIEW_INCLUDED
#define ETL_STRING_VIEW_INCLUDED
 
#include "platform.h"
#include "memory.h"
#include "iterator.h"
#include "error_handler.h"
#include "exception.h"
#include "char_traits.h"
#include "integral_limits.h"
#include "hash.h"
#include "basic_string.h"
#include "algorithm.h"
#include "private/minmax_push.h"
 
#if ETL_USING_STL && ETL_USING_CPP17
  #include <string_view>
#endif
 
#if ETL_USING_STD_OSTREAM
  #include <ostream>
#endif
 
#include <stdint.h>
 
namespace etl
{
  //***************************************************************************
  //***************************************************************************
  class string_view_exception : public exception
  {
  public:
 
    string_view_exception(string_type reason_, string_type file_name_, numeric_type line_number_)
      : exception(reason_, file_name_, line_number_)
    {
    }
  };
 
  //***************************************************************************
  //***************************************************************************
  class string_view_bounds : public string_view_exception
  {
  public:
 
    string_view_bounds(string_type file_name_, numeric_type line_number_)
      : string_view_exception(ETL_ERROR_TEXT("basic_string_view:bounds", ETL_STRING_VIEW_FILE_ID"A"), file_name_, line_number_)
    {
    }
  };
 
  //***************************************************************************
  //***************************************************************************
  class string_view_uninitialised : public string_view_exception
  {
  public:
 
    string_view_uninitialised(string_type file_name_, numeric_type line_number_)
      : string_view_exception(ETL_ERROR_TEXT("basic_string_view:uninitialised", ETL_STRING_VIEW_FILE_ID"B"), file_name_, line_number_)
    {
    }
  };
 
  //***************************************************************************
  //***************************************************************************
  template <typename T, typename TTraits = etl::char_traits<T> >
  class basic_string_view
  {
  public:
 
    typedef T        value_type;
    typedef TTraits  traits_type;
    typedef size_t   size_type;
    typedef T&       reference;
    typedef const T& const_reference;
    typedef T*       pointer;
    typedef const T* const_pointer;
    typedef const T* iterator;
    typedef const T* const_iterator;
    typedef ETL_OR_STD::reverse_iterator<const_iterator> const_reverse_iterator;
 
    enum
    {
      npos = etl::integral_limits<size_t>::max
    };
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR basic_string_view() ETL_NOEXCEPT
      : mbegin(ETL_NULLPTR)
      , mend(ETL_NULLPTR)
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR basic_string_view(const etl::ibasic_string<T>& str) ETL_NOEXCEPT
      : mbegin(str.begin())
      , mend(str.end())
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14  ETL_EXPLICIT_STRING_FROM_CHAR basic_string_view(const T* begin_) ETL_NOEXCEPT
      : mbegin(begin_)
      , mend(begin_ + TTraits::length(begin_))
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR basic_string_view(const T* begin_, const T* end_) ETL_NOEXCEPT
      : mbegin(begin_)
      , mend(end_)
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR basic_string_view(const T* begin_, size_t size_) ETL_NOEXCEPT
      : mbegin(begin_)
      , mend(begin_ + size_)
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR basic_string_view(const basic_string_view& other) ETL_NOEXCEPT
      : mbegin(other.mbegin)
      , mend(other.mend)
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR const_reference front() const
    {
      return *mbegin;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR const_reference back() const
    {
      return *(mend - 1);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR const_pointer data() const ETL_NOEXCEPT
    {
      return mbegin;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR const_iterator begin() const ETL_NOEXCEPT
    {
      return mbegin;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR const_iterator cbegin() const ETL_NOEXCEPT
    {
      return mbegin;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR const_iterator end() const ETL_NOEXCEPT
    {
      return mend;
    }
 
    //*************************************************************************
    // Returns a const iterator to the end of the array.
    //*************************************************************************
    ETL_CONSTEXPR const_iterator cend() const ETL_NOEXCEPT
    {
      return mend;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR const_reverse_iterator rbegin() const ETL_NOEXCEPT
    {
      return const_reverse_iterator(mend);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR const_reverse_iterator crbegin() const ETL_NOEXCEPT
    {
      return const_reverse_iterator(mend);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR const_reverse_iterator rend() const ETL_NOEXCEPT
    {
      return const_reverse_iterator(mbegin);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR const_reverse_iterator crend() const ETL_NOEXCEPT
    {
      return const_reverse_iterator(mbegin);
    }
 
    //*************************************************************************
    // Capacity
    //*************************************************************************
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR bool empty() const ETL_NOEXCEPT
    {
      return (mbegin == mend);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR size_t size() const ETL_NOEXCEPT
    {
      return static_cast<size_t>(mend - mbegin);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR size_t length() const ETL_NOEXCEPT
    {
      return size();
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR size_t max_size() const ETL_NOEXCEPT
    {
      return size();
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 etl::basic_string_view<T, TTraits>& operator=(const etl::basic_string_view<T, TTraits>& other) ETL_NOEXCEPT
    {
      mbegin = other.mbegin;
      mend   = other.mend;
      return *this;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 void assign(const_pointer begin_, const_pointer end_) ETL_NOEXCEPT
    {
      mbegin = begin_;
      mend   = end_;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 void assign(const_pointer begin_, size_t size_) ETL_NOEXCEPT
    {
      mbegin = begin_;
      mend   = begin_ + size_;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR const_reference operator[](size_t i) const ETL_NOEXCEPT
    {
      return mbegin[i];
    }
 
    //*************************************************************************
    //*************************************************************************
    const_reference at(size_t i) const
    {
      ETL_ASSERT((mbegin != ETL_NULLPTR && mend != ETL_NULLPTR), ETL_ERROR(string_view_uninitialised));
      ETL_ASSERT(i < size(), ETL_ERROR(string_view_bounds));
      return mbegin[i];
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 void swap(basic_string_view& other) ETL_NOEXCEPT
    {
      using ETL_OR_STD::swap; // Allow ADL
 
      swap(mbegin, other.mbegin);
      swap(mend, other.mend);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 size_type copy(T* destination, size_type count, size_type position = 0) const ETL_NOEXCEPT
    {
      size_t n = 0UL;
 
      if (position < size())
      {
        n = etl::min(count, size() - position);
 
        etl::mem_copy(mbegin + position, n, destination);
      }
 
      return n;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 basic_string_view substr(size_type position = 0, size_type count = npos) const ETL_NOEXCEPT
    {
      basic_string_view view = basic_string_view();
 
      if (position < size())
      {
        size_t n = etl::min(count, size() - position);
 
        view = basic_string_view(mbegin + position, mbegin + position + n);
      }
 
      return view;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 void remove_prefix(size_type n) ETL_NOEXCEPT
    {
      mbegin += n;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 void remove_suffix(size_type n) ETL_NOEXCEPT
    {
      mend -= n;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 int compare(basic_string_view<T, TTraits> view) const ETL_NOEXCEPT
    {
      return (*this == view) ? 0 : ((*this > view) ? 1 : -1);
    }
 
    ETL_CONSTEXPR14 int compare(size_type position, size_type count, basic_string_view view) const ETL_NOEXCEPT
    {
      return substr(position, count).compare(view);
    }
 
    ETL_CONSTEXPR14 int compare(size_type position1, size_type count1,
                                basic_string_view view,
                                size_type position2, size_type count2) const ETL_NOEXCEPT
    {
      return substr(position1, count1).compare(view.substr(position2, count2));
    }
 
    ETL_CONSTEXPR14 int compare(const T* text) const ETL_NOEXCEPT
    {
      const T* view_itr = mbegin;
      const T* text_itr = text;
 
      while (view_itr != mend && *text_itr != T(0))
      {
        if (*view_itr < *text_itr)
        {
          return -1;
        }
        else if (*view_itr > *text_itr)
        {
          return 1;
        }
        ++view_itr;
        ++text_itr;
      }
 
      if ((view_itr == mend) && (*text_itr == T(0)))
      {
        return 0;
      }
      else if (view_itr == mend)
      {
        return -1;
      }
      else
      {
        return 1;
      }
    }
 
    ETL_CONSTEXPR14 int compare(size_type position, size_type count, const T* text) const ETL_NOEXCEPT
    {
      return substr(position, count).compare(text);
    }
 
    ETL_CONSTEXPR14 int compare(size_type position, size_type count1, const T* text, size_type count2) const ETL_NOEXCEPT
    {
      return substr(position, count1).compare(etl::basic_string_view<T, TTraits>(text, count2));
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 bool starts_with(etl::basic_string_view<T, TTraits> view) const ETL_NOEXCEPT
    {
      return (size() >= view.size()) &&
             (compare(0, view.size(), view) == 0);
    }
 
    ETL_CONSTEXPR14 bool starts_with(T c) const ETL_NOEXCEPT
    {
      return !empty() && (front() == c);
    }
 
    ETL_CONSTEXPR14 bool starts_with(const T* text) const ETL_NOEXCEPT
    {
      size_t lengthtext = TTraits::length(text);
 
      return (size() >= lengthtext) &&
             (compare(0, lengthtext, text) == 0);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 bool ends_with(etl::basic_string_view<T, TTraits> view) const ETL_NOEXCEPT
    {
      return (size() >= view.size()) &&
             (compare(size() - view.size(), npos, view) == 0);
    }
 
    ETL_CONSTEXPR14 bool ends_with(T c) const
    {
      return !empty() && (back() == c);
    }
 
    ETL_CONSTEXPR14 bool ends_with(const T* text) const
    {
      size_t lengthtext = TTraits::length(text);
      size_t lengthview = size();
 
      return (lengthview >= lengthtext) &&
             (compare(lengthview - lengthtext, lengthtext, text) == 0);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 size_type find(etl::basic_string_view<T, TTraits> view, size_type position = 0) const ETL_NOEXCEPT
    {
      if ((size() < view.size()))
      {
        return npos;
      }
 
      const_iterator iposition = etl::search(begin() + position, end(), view.begin(), view.end());
 
      if (iposition == end())
      {
        return npos;
      }
      else
      {
        return etl::distance(begin(), iposition);
      }
    }
 
    ETL_CONSTEXPR14 size_type find(T c, size_type position = 0) const ETL_NOEXCEPT
    {
      return find(etl::basic_string_view<T, TTraits>(&c, 1), position);
    }
 
    ETL_CONSTEXPR14 size_type find(const T* text, size_type position, size_type count) const ETL_NOEXCEPT
    {
      return find(etl::basic_string_view<T, TTraits>(text, count), position);
    }
 
    ETL_CONSTEXPR14 size_type find(const T* text, size_type position = 0) const ETL_NOEXCEPT
    {
      return find(etl::basic_string_view<T, TTraits>(text), position);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 size_type rfind(etl::basic_string_view<T, TTraits> view, size_type position = npos) const ETL_NOEXCEPT
    {
      if ((size() < view.size()))
      {
        return npos;
      }
 
      position = etl::min(position, size());
 
      const_iterator iposition = etl::find_end(begin(),
                                               begin() + position,
                                               view.begin(),
                                               view.end());
 
      if (iposition == end())
      {
        return npos;
      }
      else
      {
        return etl::distance(begin(), iposition);
      }
    }
 
    ETL_CONSTEXPR14 size_type rfind(T c, size_type position = npos) const ETL_NOEXCEPT
    {
      return rfind(etl::basic_string_view<T, TTraits>(&c, 1), position);
    }
 
    ETL_CONSTEXPR14 size_type rfind(const T* text, size_type position, size_type count) const ETL_NOEXCEPT
    {
      return rfind(etl::basic_string_view<T, TTraits>(text, count), position);
    }
 
    ETL_CONSTEXPR14 size_type rfind(const T* text, size_type position = npos) const ETL_NOEXCEPT
    {
      return rfind(etl::basic_string_view<T, TTraits>(text), position);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 size_type find_first_of(etl::basic_string_view<T, TTraits> view, size_type position = 0) const ETL_NOEXCEPT
    {
      const size_t lengthtext = size();
 
      if (position < lengthtext)
      {
        for (size_t i = position; i < lengthtext; ++i)
        {
          const size_t lengthview = view.size();
 
          for (size_t j = 0UL; j < lengthview; ++j)
          {
            if (mbegin[i] == view[j])
            {
              return i;
            }
          }
        }
      }
 
      return npos;
    }
 
    ETL_CONSTEXPR14 size_type find_first_of(T c, size_type position = 0) const ETL_NOEXCEPT
    {
      return find_first_of(etl::basic_string_view<T, TTraits>(&c, 1), position);
    }
 
    ETL_CONSTEXPR14 size_type find_first_of(const T* text, size_type position, size_type count) const ETL_NOEXCEPT
    {
      return find_first_of(etl::basic_string_view<T, TTraits>(text, count), position);
    }
 
    ETL_CONSTEXPR14 size_type find_first_of(const T* text, size_type position = 0) const ETL_NOEXCEPT
    {
      return find_first_of(etl::basic_string_view<T, TTraits>(text), position);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 size_type find_last_of(etl::basic_string_view<T, TTraits> view, size_type position = npos) const ETL_NOEXCEPT
    {
      if (empty())
      {
        return npos;
      }
 
      position = etl::min(position, size() - 1);
 
      const_reverse_iterator it = rbegin() + size() - position - 1;
 
      while (it != rend())
      {
        const size_t viewlength = view.size();
 
        for (size_t j = 0UL; j < viewlength; ++j)
        {
          if (mbegin[position] == view[j])
          {
            return position;
          }
        }
 
        ++it;
        --position;
      }
 
      return npos;
    }
 
    ETL_CONSTEXPR14 size_type find_last_of(T c, size_type position = npos) const ETL_NOEXCEPT
    {
      return find_last_of(etl::basic_string_view<T, TTraits>(&c, 1), position);
    }
 
    ETL_CONSTEXPR14 size_type find_last_of(const T* text, size_type position, size_type count) const ETL_NOEXCEPT
    {
      return find_last_of(etl::basic_string_view<T, TTraits>(text, count), position);
    }
 
    ETL_CONSTEXPR14 size_type find_last_of(const T* text, size_type position = npos) const ETL_NOEXCEPT
    {
      return find_last_of(etl::basic_string_view<T, TTraits>(text), position);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 size_type find_first_not_of(etl::basic_string_view<T, TTraits> view, size_type position = 0) const ETL_NOEXCEPT
    {
      const size_t lengthtext = size();
 
      if (position < lengthtext)
      {
        for (size_t i = position; i < lengthtext; ++i)
        {
          bool found = false;
 
          const size_t viewlength = view.size();
 
          for (size_t j = 0UL; j < viewlength; ++j)
          {
            if (mbegin[i] == view[j])
            {
              found = true;
              break;
            }
          }
 
          if (!found)
          {
            return i;
          }
        }
      }
 
      return npos;
    }
 
    ETL_CONSTEXPR14 size_type find_first_not_of(T c, size_type position = 0) const ETL_NOEXCEPT
    {
      return find_first_not_of(etl::basic_string_view<T, TTraits>(&c, 1), position);
    }
 
    ETL_CONSTEXPR14 size_type find_first_not_of(const T* text, size_type position, size_type count) const ETL_NOEXCEPT
    {
      return find_first_not_of(etl::basic_string_view<T, TTraits>(text, count), position);
    }
 
    ETL_CONSTEXPR14 size_type find_first_not_of(const T* text, size_type position = 0) const ETL_NOEXCEPT
    {
      return find_first_not_of(etl::basic_string_view<T, TTraits>(text), position);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 size_type find_last_not_of(etl::basic_string_view<T, TTraits> view, size_type position = npos) const ETL_NOEXCEPT
    {
      if (empty())
      {
        return npos;
      }
 
      position = etl::min(position, size() - 1);
 
      const_reverse_iterator it = rbegin() + size() - position - 1;
 
      while (it != rend())
      {
        bool found = false;
 
        const size_t viewlength = view.size();
 
        for (size_t j = 0UL; j < viewlength; ++j)
        {
          if (mbegin[position] == view[j])
          {
            found = true;
            break;
          }
        }
 
        if (!found)
        {
          return position;
        }
 
        ++it;
        --position;
      }
 
      return npos;
    }
 
    ETL_CONSTEXPR14 size_type find_last_not_of(T c, size_type position = npos) const ETL_NOEXCEPT
    {
      return find_last_not_of(etl::basic_string_view<T, TTraits>(&c, 1), position);
    }
 
    ETL_CONSTEXPR14 size_type find_last_not_of(const T* text, size_type position, size_type count) const ETL_NOEXCEPT
    {
      return find_last_not_of(etl::basic_string_view<T, TTraits>(text, count), position);
    }
 
    ETL_CONSTEXPR14 size_type find_last_not_of(const T* text, size_type position = npos) const ETL_NOEXCEPT
    {
      return find_last_not_of(etl::basic_string_view<T, TTraits>(text), position);
    }
 
    //*********************************************************************
    //*********************************************************************
    bool contains(const etl::basic_string_view<T, TTraits>& view) const ETL_NOEXCEPT
    {
      return find(view) != npos;
    }
 
    //*********************************************************************
    //*********************************************************************
    bool contains(const_pointer s) const ETL_NOEXCEPT
    {
      return find(s) != npos;
    }
 
    //*********************************************************************
    //*********************************************************************
    bool contains(value_type c) const ETL_NOEXCEPT
    {
      return find(c) != npos;
    }
 
    //*************************************************************************
    //*************************************************************************
    friend ETL_CONSTEXPR14 bool operator == (const etl::basic_string_view<T, TTraits>& lhs, const etl::basic_string_view<T, TTraits>& rhs)
    {
      return (lhs.size() == rhs.size()) &&
              etl::equal(lhs.begin(), lhs.end(), rhs.begin());
    }
 
    //*************************************************************************
    //*************************************************************************
    friend ETL_CONSTEXPR14 bool operator != (const etl::basic_string_view<T, TTraits>& lhs, const etl::basic_string_view<T, TTraits>& rhs)
    {
      return !(lhs == rhs);
    }
 
    //*************************************************************************
    //*************************************************************************
    friend ETL_CONSTEXPR14 bool operator < (const etl::basic_string_view<T, TTraits>& lhs, const etl::basic_string_view<T, TTraits>& rhs)
    {
      return etl::lexicographical_compare(lhs.begin(), lhs.end(), rhs.begin(), rhs.end());
    }
 
    //*************************************************************************
    //*************************************************************************
    friend ETL_CONSTEXPR14 bool operator > (const etl::basic_string_view<T, TTraits>& lhs, const etl::basic_string_view<T, TTraits>& rhs)
    {
      return rhs < lhs;
    }
 
    //*************************************************************************
    //*************************************************************************
    friend ETL_CONSTEXPR14 bool operator <= (const etl::basic_string_view<T, TTraits>& lhs, const etl::basic_string_view<T, TTraits>& rhs)
    {
      return !(lhs > rhs);
    }
 
    //*************************************************************************
    //*************************************************************************
    friend ETL_CONSTEXPR14 bool operator >= (const etl::basic_string_view<T, TTraits>& lhs, const etl::basic_string_view<T, TTraits>& rhs)
    {
      return !(lhs < rhs);
    }
 
  private:
 
    const_pointer mbegin;
    const_pointer mend;
  };
 
  typedef etl::basic_string_view<char>     string_view;
  typedef etl::basic_string_view<wchar_t>  wstring_view;
  typedef etl::basic_string_view<char8_t>  u8string_view;
  typedef etl::basic_string_view<char16_t> u16string_view;
  typedef etl::basic_string_view<char32_t> u32string_view;
 
  //*************************************************************************
  //*************************************************************************
  template<size_t Array_Size>
  ETL_CONSTEXPR14 string_view make_string_view(const char(&text)[Array_Size]) ETL_NOEXCEPT
  {
    size_t length = etl::char_traits<char>::length(text, Array_Size - 1U);
 
    return string_view(text, length);
  }
 
  //***********************************
  template<size_t Array_Size>
  ETL_CONSTEXPR14 wstring_view make_string_view(const wchar_t(&text)[Array_Size]) ETL_NOEXCEPT
  {
    size_t length = etl::char_traits<wchar_t>::length(text, Array_Size - 1U);
 
    return wstring_view(text, length);
  }
 
  //***********************************
  template<size_t Array_Size>
  ETL_CONSTEXPR14 u8string_view make_string_view(const char8_t(&text)[Array_Size]) ETL_NOEXCEPT
  {
    size_t length = etl::char_traits<char8_t>::length(text, Array_Size - 1U);
 
    return u8string_view(text, length);
  }
 
  //***********************************
  template<size_t Array_Size>
  ETL_CONSTEXPR14 u16string_view make_string_view(const char16_t(&text)[Array_Size]) ETL_NOEXCEPT
  {
    size_t length = etl::char_traits<char16_t>::length(text, Array_Size - 1U);
 
    return u16string_view(text, length);
  }
 
  //***********************************
  template<size_t Array_Size>
  ETL_CONSTEXPR14 u32string_view make_string_view(const char32_t(&text)[Array_Size]) ETL_NOEXCEPT
  {
    size_t length = etl::char_traits<char32_t>::length(text, Array_Size - 1U);
 
    return u32string_view(text, length);
  }
 
  //*************************************************************************
  //*************************************************************************
#if ETL_USING_8BIT_TYPES
  template <>
  struct hash<etl::string_view>
  {
    size_t operator()(const etl::string_view& text) const
    {
      return etl::private_hash::generic_hash<size_t>(reinterpret_cast<const uint8_t*>(text.data()),
                                                     reinterpret_cast<const uint8_t*>(text.data() + text.size()));
    }
  };
 
  template <>
  struct hash<etl::wstring_view>
  {
    size_t operator()(const etl::wstring_view& text) const
    {
      return etl::private_hash::generic_hash<size_t>(reinterpret_cast<const uint8_t*>(text.data()),
                                                     reinterpret_cast<const uint8_t*>(text.data() + text.size()));
    }
  };
 
  template <>
  struct hash<etl::u16string_view>
  {
    size_t operator()(const etl::u16string_view& text) const
    {
      return etl::private_hash::generic_hash<size_t>(reinterpret_cast<const uint8_t*>(text.data()),
                                                     reinterpret_cast<const uint8_t*>(text.data() + text.size()));
    }
  };
 
  template <>
  struct hash<etl::u32string_view>
  {
    size_t operator()(const etl::u32string_view& text) const
    {
      return etl::private_hash::generic_hash<size_t>(reinterpret_cast<const uint8_t*>(text.data()),
                                                     reinterpret_cast<const uint8_t*>(text.data() + text.size()));
    }
  };
#endif
}
 
//*************************************************************************
//*************************************************************************
template <typename T, typename TTraits >
void swap(etl::basic_string_view<T, TTraits>& lhs, etl::basic_string_view<T, TTraits>& rhs) ETL_NOEXCEPT
{
  lhs.swap(rhs);
}
 
template <typename T>
void swap(etl::basic_string_view<T, etl::char_traits<T> >& lhs, etl::basic_string_view<T, etl::char_traits<T> >& rhs) ETL_NOEXCEPT
{
  lhs.swap(rhs);
}
 
//*************************************************************************
//*************************************************************************
#if ETL_USING_STD_OSTREAM
template <typename T>
std::basic_ostream<T, std::char_traits<T> > &operator<<(std::basic_ostream<T, std::char_traits<T> > &os, 
                                                        etl::basic_string_view<T, etl::char_traits<T> > text)
{
  os.write(text.data(), text.size());
  return os;
}
#endif
 
#include "private/minmax_pop.h"
 
#endif