pw_span: Delete unused span polyfill header
Change-Id: If567f5c969418f69898bae574cd4be6e82f37570
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/108992
Pigweed-Auto-Submit: Wyatt Hepler <hepler@google.com>
Reviewed-by: Armando Montanez <amontanez@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/pw_span/public/pw_span/internal/span_polyfill.h b/pw_span/public/pw_span/internal/span_polyfill.h
deleted file mode 100644
index 6689db3..0000000
--- a/pw_span/public/pw_span/internal/span_polyfill.h
+++ /dev/null
@@ -1,62 +0,0 @@
-// Copyright 2020 The Pigweed Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-// https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
-
-// std::span is a stand-in for C++20's std::span. Do NOT include this header
-// directly; instead, include it as <span>.
-//
-// A span is a non-owning array view class. It refers to an external array by
-// storing a pointer and length. Unlike std::array, the size does not have to be
-// a template parameter, so this class can be used to without stating its size.
-//
-// This file a modified version of base::span from Chromium:
-// https://chromium.googlesource.com/chromium/src/+/d93ae920e4309682deb9352a4637cfc2941c1d1f/base/containers/span.h
-//
-// In order to minimize changes from the original, this file does NOT fully
-// adhere to Pigweed's style guide.
-//
-// A few changes were made to the Chromium version of span. These include:
-// - Use std::data and std::size instead of base::* versions.
-// - Rename base namespace to std.
-// - Rename internal namespace to pw_span_internal.
-// - Remove uses of checked_iterators.h and CHECK.
-// - Replace make_span functions with C++17 class template deduction guides.
-// - Use std::byte instead of uint8_t for compatibility with std::span.
-//
-#pragma once
-
-#include "pw_polyfill/standard_library/namespace.h"
-
-#ifndef __cpp_lib_span
-
-// When polyfilling std::span, set __cpp_lib_span to the standard value of
-// 202002L. When std::span is not polyfilled, this header should not be used. To
-// support testing non-polyfilled std::span alongside pw::span, set
-// __cpp_lib_span to 202001L (lower than the standard value) so that pw::span is
-// not aliased to std::span.
-#ifdef _PW_SPAN_POLYFILL_ENABLED
-#undef _PW_SPAN_POLYFILL_ENABLED
-#define __cpp_lib_span 202002L
-#else
-#define __cpp_lib_span 202001L
-#endif // _PW_SPAN_POLYFILL_ENABLED
-
-#define _PW_SPAN_COMMON_NAMEPACE_BEGIN _PW_POLYFILL_BEGIN_NAMESPACE_STD
-#define _PW_SPAN_COMMON_NAMEPACE_END _PW_POLYFILL_END_NAMESPACE_STD
-
-#include "pw_span/internal/span_common.inc"
-
-#undef _PW_SPAN_COMMON_NAMEPACE_BEGIN
-#undef _PW_SPAN_COMMON_NAMEPACE_END
-
-#endif // __cpp_lib_span
