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 ///////////////////////////////////////////////////////////////////////////////
 //
 // Copyright (c) 2015 Microsoft Corporation. All rights reserved.
 //
 // This code is licensed under the MIT License (MIT).
 //
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 //
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef GSL_SPAN_EXT_H
 #define GSL_SPAN_EXT_H
 
 ///////////////////////////////////////////////////////////////////////////////
 //
 // File: span_ext
 // Purpose: continue offering features that have been cut from the official
 //   implementation of span.
 //   While modernizing gsl::span a number of features needed to be removed to
 //   be compliant with the design of std::span
 //
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "./assert" // GSL_KERNEL_MODE
 #include "./util"   // for narrow_cast, narrow
 
 #include <cstddef> // for ptrdiff_t, size_t
 #include <utility>
 
 #ifndef GSL_KERNEL_MODE
 #include <algorithm> // for lexicographical_compare
 #endif               // GSL_KERNEL_MODE
 
 namespace gsl
 {
 
 // [span.views.constants], constants
 GSL_INLINE constexpr const std::size_t dynamic_extent = narrow_cast<std::size_t>(-1);
 
 template <class ElementType, std::size_t Extent = dynamic_extent>
 class span;
 
 // std::equal and std::lexicographical_compare are not /kernel compatible
 // so all comparison operators must be removed for kernel mode.
 #ifndef GSL_KERNEL_MODE
 
 // [span.comparison], span comparison operators
 template <class ElementType, std::size_t FirstExtent, std::size_t SecondExtent>
 constexpr bool operator==(span<ElementType, FirstExtent> l, span<ElementType, SecondExtent> r)
 {
     return std::equal(l.begin(), l.end(), r.begin(), r.end());
 }
 
 template <class ElementType, std::size_t Extent>
 constexpr bool operator!=(span<ElementType, Extent> l, span<ElementType, Extent> r)
 {
     return !(l == r);
 }
 
 template <class ElementType, std::size_t Extent>
 constexpr bool operator<(span<ElementType, Extent> l, span<ElementType, Extent> r)
 {
     return std::lexicographical_compare(l.begin(), l.end(), r.begin(), r.end());
 }
 
 template <class ElementType, std::size_t Extent>
 constexpr bool operator<=(span<ElementType, Extent> l, span<ElementType, Extent> r)
 {
     return !(l > r);
 }
 
 template <class ElementType, std::size_t Extent>
 constexpr bool operator>(span<ElementType, Extent> l, span<ElementType, Extent> r)
 {
     return r < l;
 }
 
 template <class ElementType, std::size_t Extent>
 constexpr bool operator>=(span<ElementType, Extent> l, span<ElementType, Extent> r)
 {
     return !(l < r);
 }
 
 #endif // GSL_KERNEL_MODE
 
 //
 // make_span() - Utility functions for creating spans
 //
 template <class ElementType>
 constexpr span<ElementType> make_span(ElementType* ptr, typename span<ElementType>::size_type count)
 {
     return span<ElementType>(ptr, count);
 }
 
 template <class ElementType>
 constexpr span<ElementType> make_span(ElementType* firstElem, ElementType* lastElem)
 {
     return span<ElementType>(firstElem, lastElem);
 }
 
 template <class ElementType, std::size_t N>
 constexpr span<ElementType, N> make_span(ElementType (&arr)[N]) noexcept
 {
     return span<ElementType, N>(arr);
 }
 
 template <class Container>
 constexpr span<typename Container::value_type> make_span(Container& cont)
 {
     return span<typename Container::value_type>(cont);
 }
 
 template <class Container>
 constexpr span<const typename Container::value_type> make_span(const Container& cont)
 {
     return span<const typename Container::value_type>(cont);
 }
 
 template <class Ptr>
 GSL_DEPRECATED("This function is deprecated. See GSL issue #1092.")
 constexpr span<typename Ptr::element_type> make_span(Ptr& cont, std::size_t count)
 {
     return span<typename Ptr::element_type>(cont, count);
 }
 
 template <class Ptr>
 GSL_DEPRECATED("This function is deprecated. See GSL issue #1092.")
 constexpr span<typename Ptr::element_type> make_span(Ptr& cont)
 {
     return span<typename Ptr::element_type>(cont);
 }
 
 // Specialization of gsl::at for span
 template <class ElementType, std::size_t Extent>
 constexpr ElementType& at(span<ElementType, Extent> s, index i)
 {
     // No bounds checking here because it is done in span::operator[] called below
     Ensures(i >= 0);
     return s[narrow_cast<std::size_t>(i)];
 }
 
 // [span.obs] Free observer functions
 template <class ElementType, std::size_t Extent>
 constexpr std::ptrdiff_t ssize(const span<ElementType, Extent>& s) noexcept
 {
     return static_cast<std::ptrdiff_t>(s.size());
 }
 
 // [span.iter] Free functions for begin/end functions
 template <class ElementType, std::size_t Extent>
 constexpr typename span<ElementType, Extent>::iterator
 begin(const span<ElementType, Extent>& s) noexcept
 {
     return s.begin();
 }
 
 template <class ElementType, std::size_t Extent = dynamic_extent>
 constexpr typename span<ElementType, Extent>::iterator
 end(const span<ElementType, Extent>& s) noexcept
 {
     return s.end();
 }
 
 template <class ElementType, std::size_t Extent>
 constexpr typename span<ElementType, Extent>::reverse_iterator
 rbegin(const span<ElementType, Extent>& s) noexcept
 {
     return s.rbegin();
 }
 
 template <class ElementType, std::size_t Extent>
 constexpr typename span<ElementType, Extent>::reverse_iterator
 rend(const span<ElementType, Extent>& s) noexcept
 {
     return s.rend();
 }
 
 template <class ElementType, std::size_t Extent>
 constexpr typename span<ElementType, Extent>::iterator
 cbegin(const span<ElementType, Extent>& s) noexcept
 {
     return s.begin();
 }
 
 template <class ElementType, std::size_t Extent = dynamic_extent>
 constexpr typename span<ElementType, Extent>::iterator
 cend(const span<ElementType, Extent>& s) noexcept
 {
     return s.end();
 }
 
 template <class ElementType, std::size_t Extent>
 constexpr typename span<ElementType, Extent>::reverse_iterator
 crbegin(const span<ElementType, Extent>& s) noexcept
 {
     return s.rbegin();
 }
 
 template <class ElementType, std::size_t Extent>
 constexpr typename span<ElementType, Extent>::reverse_iterator
 crend(const span<ElementType, Extent>& s) noexcept
 {
     return s.rend();
 }
 
 } // namespace gsl
 
 #endif // GSL_SPAN_EXT_H

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