chore(3p/abseil_cpp): unvendor abseil_cpp r/3786

we weren't actually using these sources anymore, okay?

Change-Id: If701571d9716de308d3512e1eb22c35db0877a66
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5248
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
Autosubmit: tazjin <tazjin@tvl.su>

1 files changed, 0 insertions, 953 deletions

diff --git a/third_party/abseil_cpp/absl/strings/str_split_test.cc b/third_party/abseil_cpp/absl/strings/str_split_test.cc
deleted file mode 100644
index 7f7c097faee2..000000000000
--- a/third_party/abseil_cpp/absl/strings/str_split_test.cc
+++ /dev/null
@@ -1,953 +0,0 @@
-// Copyright 2017 The Abseil 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.
-
-#include "absl/strings/str_split.h"
-
-#include <deque>
-#include <initializer_list>
-#include <list>
-#include <map>
-#include <memory>
-#include <string>
-#include <type_traits>
-#include <unordered_map>
-#include <unordered_set>
-#include <vector>
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include "absl/base/dynamic_annotations.h"
-#include "absl/base/macros.h"
-#include "absl/container/flat_hash_map.h"
-#include "absl/container/node_hash_map.h"
-#include "absl/strings/numbers.h"
-
-namespace {
-
-using ::testing::ElementsAre;
-using ::testing::Pair;
-using ::testing::UnorderedElementsAre;
-
-TEST(Split, TraitsTest) {
-  static_assert(!absl::strings_internal::SplitterIsConvertibleTo<int>::value,
-                "");
-  static_assert(
-      !absl::strings_internal::SplitterIsConvertibleTo<std::string>::value, "");
-  static_assert(absl::strings_internal::SplitterIsConvertibleTo<
-                    std::vector<std::string>>::value,
-                "");
-  static_assert(
-      !absl::strings_internal::SplitterIsConvertibleTo<std::vector<int>>::value,
-      "");
-  static_assert(absl::strings_internal::SplitterIsConvertibleTo<
-                    std::vector<absl::string_view>>::value,
-                "");
-  static_assert(absl::strings_internal::SplitterIsConvertibleTo<
-                    std::map<std::string, std::string>>::value,
-                "");
-  static_assert(absl::strings_internal::SplitterIsConvertibleTo<
-                    std::map<absl::string_view, absl::string_view>>::value,
-                "");
-  static_assert(!absl::strings_internal::SplitterIsConvertibleTo<
-                    std::map<int, std::string>>::value,
-                "");
-  static_assert(!absl::strings_internal::SplitterIsConvertibleTo<
-                    std::map<std::string, int>>::value,
-                "");
-}
-
-// This tests the overall split API, which is made up of the absl::StrSplit()
-// function and the Delimiter objects in the absl:: namespace.
-// This TEST macro is outside of any namespace to require full specification of
-// namespaces just like callers will need to use.
-TEST(Split, APIExamples) {
-  {
-    // Passes string delimiter. Assumes the default of ByString.
-    std::vector<std::string> v = absl::StrSplit("a,b,c", ",");  // NOLINT
-    EXPECT_THAT(v, ElementsAre("a", "b", "c"));
-
-    // Equivalent to...
-    using absl::ByString;
-    v = absl::StrSplit("a,b,c", ByString(","));
-    EXPECT_THAT(v, ElementsAre("a", "b", "c"));
-
-    // Equivalent to...
-    EXPECT_THAT(absl::StrSplit("a,b,c", ByString(",")),
-                ElementsAre("a", "b", "c"));
-  }
-
-  {
-    // Same as above, but using a single character as the delimiter.
-    std::vector<std::string> v = absl::StrSplit("a,b,c", ',');
-    EXPECT_THAT(v, ElementsAre("a", "b", "c"));
-
-    // Equivalent to...
-    using absl::ByChar;
-    v = absl::StrSplit("a,b,c", ByChar(','));
-    EXPECT_THAT(v, ElementsAre("a", "b", "c"));
-  }
-
-  {
-    // Uses the Literal string "=>" as the delimiter.
-    const std::vector<std::string> v = absl::StrSplit("a=>b=>c", "=>");
-    EXPECT_THAT(v, ElementsAre("a", "b", "c"));
-  }
-
-  {
-    // The substrings are returned as string_views, eliminating copying.
-    std::vector<absl::string_view> v = absl::StrSplit("a,b,c", ',');
-    EXPECT_THAT(v, ElementsAre("a", "b", "c"));
-  }
-
-  {
-    // Leading and trailing empty substrings.
-    std::vector<std::string> v = absl::StrSplit(",a,b,c,", ',');
-    EXPECT_THAT(v, ElementsAre("", "a", "b", "c", ""));
-  }
-
-  {
-    // Splits on a delimiter that is not found.
-    std::vector<std::string> v = absl::StrSplit("abc", ',');
-    EXPECT_THAT(v, ElementsAre("abc"));
-  }
-
-  {
-    // Splits the input string into individual characters by using an empty
-    // string as the delimiter.
-    std::vector<std::string> v = absl::StrSplit("abc", "");
-    EXPECT_THAT(v, ElementsAre("a", "b", "c"));
-  }
-
-  {
-    // Splits string data with embedded NUL characters, using NUL as the
-    // delimiter. A simple delimiter of "\0" doesn't work because strlen() will
-    // say that's the empty string when constructing the absl::string_view
-    // delimiter. Instead, a non-empty string containing NUL can be used as the
-    // delimiter.
-    std::string embedded_nulls("a\0b\0c", 5);
-    std::string null_delim("\0", 1);
-    std::vector<std::string> v = absl::StrSplit(embedded_nulls, null_delim);
-    EXPECT_THAT(v, ElementsAre("a", "b", "c"));
-  }
-
-  {
-    // Stores first two split strings as the members in a std::pair.
-    std::pair<std::string, std::string> p = absl::StrSplit("a,b,c", ',');
-    EXPECT_EQ("a", p.first);
-    EXPECT_EQ("b", p.second);
-    // "c" is omitted because std::pair can hold only two elements.
-  }
-
-  {
-    // Results stored in std::set<std::string>
-    std::set<std::string> v = absl::StrSplit("a,b,c,a,b,c,a,b,c", ',');
-    EXPECT_THAT(v, ElementsAre("a", "b", "c"));
-  }
-
-  {
-    // Uses a non-const char* delimiter.
-    char a[] = ",";
-    char* d = a + 0;
-    std::vector<std::string> v = absl::StrSplit("a,b,c", d);
-    EXPECT_THAT(v, ElementsAre("a", "b", "c"));
-  }
-
-  {
-    // Results split using either of , or ;
-    using absl::ByAnyChar;
-    std::vector<std::string> v = absl::StrSplit("a,b;c", ByAnyChar(",;"));
-    EXPECT_THAT(v, ElementsAre("a", "b", "c"));
-  }
-
-  {
-    // Uses the SkipWhitespace predicate.
-    using absl::SkipWhitespace;
-    std::vector<std::string> v =
-        absl::StrSplit(" a , ,,b,", ',', SkipWhitespace());
-    EXPECT_THAT(v, ElementsAre(" a ", "b"));
-  }
-
-  {
-    // Uses the ByLength delimiter.
-    using absl::ByLength;
-    std::vector<std::string> v = absl::StrSplit("abcdefg", ByLength(3));
-    EXPECT_THAT(v, ElementsAre("abc", "def", "g"));
-  }
-
-  {
-    // Different forms of initialization / conversion.
-    std::vector<std::string> v1 = absl::StrSplit("a,b,c", ',');
-    EXPECT_THAT(v1, ElementsAre("a", "b", "c"));
-    std::vector<std::string> v2(absl::StrSplit("a,b,c", ','));
-    EXPECT_THAT(v2, ElementsAre("a", "b", "c"));
-    auto v3 = std::vector<std::string>(absl::StrSplit("a,b,c", ','));
-    EXPECT_THAT(v3, ElementsAre("a", "b", "c"));
-    v3 = absl::StrSplit("a,b,c", ',');
-    EXPECT_THAT(v3, ElementsAre("a", "b", "c"));
-  }
-
-  {
-    // Results stored in a std::map.
-    std::map<std::string, std::string> m = absl::StrSplit("a,1,b,2,a,3", ',');
-    EXPECT_EQ(2, m.size());
-    EXPECT_EQ("3", m["a"]);
-    EXPECT_EQ("2", m["b"]);
-  }
-
-  {
-    // Results stored in a std::multimap.
-    std::multimap<std::string, std::string> m =
-        absl::StrSplit("a,1,b,2,a,3", ',');
-    EXPECT_EQ(3, m.size());
-    auto it = m.find("a");
-    EXPECT_EQ("1", it->second);
-    ++it;
-    EXPECT_EQ("3", it->second);
-    it = m.find("b");
-    EXPECT_EQ("2", it->second);
-  }
-
-  {
-    // Demonstrates use in a range-based for loop in C++11.
-    std::string s = "x,x,x,x,x,x,x";
-    for (absl::string_view sp : absl::StrSplit(s, ',')) {
-      EXPECT_EQ("x", sp);
-    }
-  }
-
-  {
-    // Demonstrates use with a Predicate in a range-based for loop.
-    using absl::SkipWhitespace;
-    std::string s = " ,x,,x,,x,x,x,,";
-    for (absl::string_view sp : absl::StrSplit(s, ',', SkipWhitespace())) {
-      EXPECT_EQ("x", sp);
-    }
-  }
-
-  {
-    // Demonstrates a "smart" split to std::map using two separate calls to
-    // absl::StrSplit. One call to split the records, and another call to split
-    // the keys and values. This also uses the Limit delimiter so that the
-    // std::string "a=b=c" will split to "a" -> "b=c".
-    std::map<std::string, std::string> m;
-    for (absl::string_view sp : absl::StrSplit("a=b=c,d=e,f=,g", ',')) {
-      m.insert(absl::StrSplit(sp, absl::MaxSplits('=', 1)));
-    }
-    EXPECT_EQ("b=c", m.find("a")->second);
-    EXPECT_EQ("e", m.find("d")->second);
-    EXPECT_EQ("", m.find("f")->second);
-    EXPECT_EQ("", m.find("g")->second);
-  }
-}
-
-//
-// Tests for SplitIterator
-//
-
-TEST(SplitIterator, Basics) {
-  auto splitter = absl::StrSplit("a,b", ',');
-  auto it = splitter.begin();
-  auto end = splitter.end();
-
-  EXPECT_NE(it, end);
-  EXPECT_EQ("a", *it);  // tests dereference
-  ++it;                 // tests preincrement
-  EXPECT_NE(it, end);
-  EXPECT_EQ("b",
-            std::string(it->data(), it->size()));  // tests dereference as ptr
-  it++;                                            // tests postincrement
-  EXPECT_EQ(it, end);
-}
-
-// Simple Predicate to skip a particular string.
-class Skip {
- public:
-  explicit Skip(const std::string& s) : s_(s) {}
-  bool operator()(absl::string_view sp) { return sp != s_; }
-
- private:
-  std::string s_;
-};
-
-TEST(SplitIterator, Predicate) {
-  auto splitter = absl::StrSplit("a,b,c", ',', Skip("b"));
-  auto it = splitter.begin();
-  auto end = splitter.end();
-
-  EXPECT_NE(it, end);
-  EXPECT_EQ("a", *it);  // tests dereference
-  ++it;                 // tests preincrement -- "b" should be skipped here.
-  EXPECT_NE(it, end);
-  EXPECT_EQ("c",
-            std::string(it->data(), it->size()));  // tests dereference as ptr
-  it++;                                            // tests postincrement
-  EXPECT_EQ(it, end);
-}
-
-TEST(SplitIterator, EdgeCases) {
-  // Expected input and output, assuming a delimiter of ','
-  struct {
-    std::string in;
-    std::vector<std::string> expect;
-  } specs[] = {
-      {"", {""}},
-      {"foo", {"foo"}},
-      {",", {"", ""}},
-      {",foo", {"", "foo"}},
-      {"foo,", {"foo", ""}},
-      {",foo,", {"", "foo", ""}},
-      {"foo,bar", {"foo", "bar"}},
-  };
-
-  for (const auto& spec : specs) {
-    SCOPED_TRACE(spec.in);
-    auto splitter = absl::StrSplit(spec.in, ',');
-    auto it = splitter.begin();
-    auto end = splitter.end();
-    for (const auto& expected : spec.expect) {
-      EXPECT_NE(it, end);
-      EXPECT_EQ(expected, *it++);
-    }
-    EXPECT_EQ(it, end);
-  }
-}
-
-TEST(Splitter, Const) {
-  const auto splitter = absl::StrSplit("a,b,c", ',');
-  EXPECT_THAT(splitter, ElementsAre("a", "b", "c"));
-}
-
-TEST(Split, EmptyAndNull) {
-  // Attention: Splitting a null absl::string_view is different than splitting
-  // an empty absl::string_view even though both string_views are considered
-  // equal. This behavior is likely surprising and undesirable. However, to
-  // maintain backward compatibility, there is a small "hack" in
-  // str_split_internal.h that preserves this behavior. If that behavior is ever
-  // changed/fixed, this test will need to be updated.
-  EXPECT_THAT(absl::StrSplit(absl::string_view(""), '-'), ElementsAre(""));
-  EXPECT_THAT(absl::StrSplit(absl::string_view(), '-'), ElementsAre());
-}
-
-TEST(SplitIterator, EqualityAsEndCondition) {
-  auto splitter = absl::StrSplit("a,b,c", ',');
-  auto it = splitter.begin();
-  auto it2 = it;
-
-  // Increments it2 twice to point to "c" in the input text.
-  ++it2;
-  ++it2;
-  EXPECT_EQ("c", *it2);
-
-  // This test uses a non-end SplitIterator as the terminating condition in a
-  // for loop. This relies on SplitIterator equality for non-end SplitIterators
-  // working correctly. At this point it2 points to "c", and we use that as the
-  // "end" condition in this test.
-  std::vector<absl::string_view> v;
-  for (; it != it2; ++it) {
-    v.push_back(*it);
-  }
-  EXPECT_THAT(v, ElementsAre("a", "b"));
-}
-
-//
-// Tests for Splitter
-//
-
-TEST(Splitter, RangeIterators) {
-  auto splitter = absl::StrSplit("a,b,c", ',');
-  std::vector<absl::string_view> output;
-  for (const absl::string_view& p : splitter) {
-    output.push_back(p);
-  }
-  EXPECT_THAT(output, ElementsAre("a", "b", "c"));
-}
-
-// Some template functions for use in testing conversion operators
-template <typename ContainerType, typename Splitter>
-void TestConversionOperator(const Splitter& splitter) {
-  ContainerType output = splitter;
-  EXPECT_THAT(output, UnorderedElementsAre("a", "b", "c", "d"));
-}
-
-template <typename MapType, typename Splitter>
-void TestMapConversionOperator(const Splitter& splitter) {
-  MapType m = splitter;
-  EXPECT_THAT(m, UnorderedElementsAre(Pair("a", "b"), Pair("c", "d")));
-}
-
-template <typename FirstType, typename SecondType, typename Splitter>
-void TestPairConversionOperator(const Splitter& splitter) {
-  std::pair<FirstType, SecondType> p = splitter;
-  EXPECT_EQ(p, (std::pair<FirstType, SecondType>("a", "b")));
-}
-
-TEST(Splitter, ConversionOperator) {
-  auto splitter = absl::StrSplit("a,b,c,d", ',');
-
-  TestConversionOperator<std::vector<absl::string_view>>(splitter);
-  TestConversionOperator<std::vector<std::string>>(splitter);
-  TestConversionOperator<std::list<absl::string_view>>(splitter);
-  TestConversionOperator<std::list<std::string>>(splitter);
-  TestConversionOperator<std::deque<absl::string_view>>(splitter);
-  TestConversionOperator<std::deque<std::string>>(splitter);
-  TestConversionOperator<std::set<absl::string_view>>(splitter);
-  TestConversionOperator<std::set<std::string>>(splitter);
-  TestConversionOperator<std::multiset<absl::string_view>>(splitter);
-  TestConversionOperator<std::multiset<std::string>>(splitter);
-  TestConversionOperator<std::unordered_set<std::string>>(splitter);
-
-  // Tests conversion to map-like objects.
-
-  TestMapConversionOperator<std::map<absl::string_view, absl::string_view>>(
-      splitter);
-  TestMapConversionOperator<std::map<absl::string_view, std::string>>(splitter);
-  TestMapConversionOperator<std::map<std::string, absl::string_view>>(splitter);
-  TestMapConversionOperator<std::map<std::string, std::string>>(splitter);
-  TestMapConversionOperator<
-      std::multimap<absl::string_view, absl::string_view>>(splitter);
-  TestMapConversionOperator<std::multimap<absl::string_view, std::string>>(
-      splitter);
-  TestMapConversionOperator<std::multimap<std::string, absl::string_view>>(
-      splitter);
-  TestMapConversionOperator<std::multimap<std::string, std::string>>(splitter);
-  TestMapConversionOperator<std::unordered_map<std::string, std::string>>(
-      splitter);
-  TestMapConversionOperator<
-      absl::node_hash_map<absl::string_view, absl::string_view>>(splitter);
-  TestMapConversionOperator<
-      absl::node_hash_map<absl::string_view, std::string>>(splitter);
-  TestMapConversionOperator<
-      absl::node_hash_map<std::string, absl::string_view>>(splitter);
-  TestMapConversionOperator<
-      absl::flat_hash_map<absl::string_view, absl::string_view>>(splitter);
-  TestMapConversionOperator<
-      absl::flat_hash_map<absl::string_view, std::string>>(splitter);
-  TestMapConversionOperator<
-      absl::flat_hash_map<std::string, absl::string_view>>(splitter);
-
-  // Tests conversion to std::pair
-
-  TestPairConversionOperator<absl::string_view, absl::string_view>(splitter);
-  TestPairConversionOperator<absl::string_view, std::string>(splitter);
-  TestPairConversionOperator<std::string, absl::string_view>(splitter);
-  TestPairConversionOperator<std::string, std::string>(splitter);
-}
-
-// A few additional tests for conversion to std::pair. This conversion is
-// different from others because a std::pair always has exactly two elements:
-// .first and .second. The split has to work even when the split has
-// less-than, equal-to, and more-than 2 strings.
-TEST(Splitter, ToPair) {
-  {
-    // Empty string
-    std::pair<std::string, std::string> p = absl::StrSplit("", ',');
-    EXPECT_EQ("", p.first);
-    EXPECT_EQ("", p.second);
-  }
-
-  {
-    // Only first
-    std::pair<std::string, std::string> p = absl::StrSplit("a", ',');
-    EXPECT_EQ("a", p.first);
-    EXPECT_EQ("", p.second);
-  }
-
-  {
-    // Only second
-    std::pair<std::string, std::string> p = absl::StrSplit(",b", ',');
-    EXPECT_EQ("", p.first);
-    EXPECT_EQ("b", p.second);
-  }
-
-  {
-    // First and second.
-    std::pair<std::string, std::string> p = absl::StrSplit("a,b", ',');
-    EXPECT_EQ("a", p.first);
-    EXPECT_EQ("b", p.second);
-  }
-
-  {
-    // First and second and then more stuff that will be ignored.
-    std::pair<std::string, std::string> p = absl::StrSplit("a,b,c", ',');
-    EXPECT_EQ("a", p.first);
-    EXPECT_EQ("b", p.second);
-    // "c" is omitted.
-  }
-}
-
-TEST(Splitter, Predicates) {
-  static const char kTestChars[] = ",a, ,b,";
-  using absl::AllowEmpty;
-  using absl::SkipEmpty;
-  using absl::SkipWhitespace;
-
-  {
-    // No predicate. Does not skip empties.
-    auto splitter = absl::StrSplit(kTestChars, ',');
-    std::vector<std::string> v = splitter;
-    EXPECT_THAT(v, ElementsAre("", "a", " ", "b", ""));
-  }
-
-  {
-    // Allows empty strings. Same behavior as no predicate at all.
-    auto splitter = absl::StrSplit(kTestChars, ',', AllowEmpty());
-    std::vector<std::string> v_allowempty = splitter;
-    EXPECT_THAT(v_allowempty, ElementsAre("", "a", " ", "b", ""));
-
-    // Ensures AllowEmpty equals the behavior with no predicate.
-    auto splitter_nopredicate = absl::StrSplit(kTestChars, ',');
-    std::vector<std::string> v_nopredicate = splitter_nopredicate;
-    EXPECT_EQ(v_allowempty, v_nopredicate);
-  }
-
-  {
-    // Skips empty strings.
-    auto splitter = absl::StrSplit(kTestChars, ',', SkipEmpty());
-    std::vector<std::string> v = splitter;
-    EXPECT_THAT(v, ElementsAre("a", " ", "b"));
-  }
-
-  {
-    // Skips empty and all-whitespace strings.
-    auto splitter = absl::StrSplit(kTestChars, ',', SkipWhitespace());
-    std::vector<std::string> v = splitter;
-    EXPECT_THAT(v, ElementsAre("a", "b"));
-  }
-}
-
-//
-// Tests for StrSplit()
-//
-
-TEST(Split, Basics) {
-  {
-    // Doesn't really do anything useful because the return value is ignored,
-    // but it should work.
-    absl::StrSplit("a,b,c", ',');
-  }
-
-  {
-    std::vector<absl::string_view> v = absl::StrSplit("a,b,c", ',');
-    EXPECT_THAT(v, ElementsAre("a", "b", "c"));
-  }
-
-  {
-    std::vector<std::string> v = absl::StrSplit("a,b,c", ',');
-    EXPECT_THAT(v, ElementsAre("a", "b", "c"));
-  }
-
-  {
-    // Ensures that assignment works. This requires a little extra work with
-    // C++11 because of overloads with initializer_list.
-    std::vector<std::string> v;
-    v = absl::StrSplit("a,b,c", ',');
-
-    EXPECT_THAT(v, ElementsAre("a", "b", "c"));
-    std::map<std::string, std::string> m;
-    m = absl::StrSplit("a,b,c", ',');
-    EXPECT_EQ(2, m.size());
-    std::unordered_map<std::string, std::string> hm;
-    hm = absl::StrSplit("a,b,c", ',');
-    EXPECT_EQ(2, hm.size());
-  }
-}
-
-absl::string_view ReturnStringView() { return "Hello World"; }
-const char* ReturnConstCharP() { return "Hello World"; }
-char* ReturnCharP() { return const_cast<char*>("Hello World"); }
-
-TEST(Split, AcceptsCertainTemporaries) {
-  std::vector<std::string> v;
-  v = absl::StrSplit(ReturnStringView(), ' ');
-  EXPECT_THAT(v, ElementsAre("Hello", "World"));
-  v = absl::StrSplit(ReturnConstCharP(), ' ');
-  EXPECT_THAT(v, ElementsAre("Hello", "World"));
-  v = absl::StrSplit(ReturnCharP(), ' ');
-  EXPECT_THAT(v, ElementsAre("Hello", "World"));
-}
-
-TEST(Split, Temporary) {
-  // Use a std::string longer than the SSO length, so that when the temporary is
-  // destroyed, if the splitter keeps a reference to the string's contents,
-  // it'll reference freed memory instead of just dead on-stack memory.
-  const char input[] = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u";
-  EXPECT_LT(sizeof(std::string), ABSL_ARRAYSIZE(input))
-      << "Input should be larger than fits on the stack.";
-
-  // This happens more often in C++11 as part of a range-based for loop.
-  auto splitter = absl::StrSplit(std::string(input), ',');
-  std::string expected = "a";
-  for (absl::string_view letter : splitter) {
-    EXPECT_EQ(expected, letter);
-    ++expected[0];
-  }
-  EXPECT_EQ("v", expected);
-
-  // This happens more often in C++11 as part of a range-based for loop.
-  auto std_splitter = absl::StrSplit(std::string(input), ',');
-  expected = "a";
-  for (absl::string_view letter : std_splitter) {
-    EXPECT_EQ(expected, letter);
-    ++expected[0];
-  }
-  EXPECT_EQ("v", expected);
-}
-
-template <typename T>
-static std::unique_ptr<T> CopyToHeap(const T& value) {
-  return std::unique_ptr<T>(new T(value));
-}
-
-TEST(Split, LvalueCaptureIsCopyable) {
-  std::string input = "a,b";
-  auto heap_splitter = CopyToHeap(absl::StrSplit(input, ','));
-  auto stack_splitter = *heap_splitter;
-  heap_splitter.reset();
-  std::vector<std::string> result = stack_splitter;
-  EXPECT_THAT(result, testing::ElementsAre("a", "b"));
-}
-
-TEST(Split, TemporaryCaptureIsCopyable) {
-  auto heap_splitter = CopyToHeap(absl::StrSplit(std::string("a,b"), ','));
-  auto stack_splitter = *heap_splitter;
-  heap_splitter.reset();
-  std::vector<std::string> result = stack_splitter;
-  EXPECT_THAT(result, testing::ElementsAre("a", "b"));
-}
-
-TEST(Split, SplitterIsCopyableAndMoveable) {
-  auto a = absl::StrSplit("foo", '-');
-
-  // Ensures that the following expressions compile.
-  auto b = a;             // Copy construct
-  auto c = std::move(a);  // Move construct
-  b = c;                  // Copy assign
-  c = std::move(b);       // Move assign
-
-  EXPECT_THAT(c, ElementsAre("foo"));
-}
-
-TEST(Split, StringDelimiter) {
-  {
-    std::vector<absl::string_view> v = absl::StrSplit("a,b", ',');
-    EXPECT_THAT(v, ElementsAre("a", "b"));
-  }
-
-  {
-    std::vector<absl::string_view> v = absl::StrSplit("a,b", std::string(","));
-    EXPECT_THAT(v, ElementsAre("a", "b"));
-  }
-
-  {
-    std::vector<absl::string_view> v =
-        absl::StrSplit("a,b", absl::string_view(","));
-    EXPECT_THAT(v, ElementsAre("a", "b"));
-  }
-}
-
-#if !defined(__cpp_char8_t)
-#if defined(__clang__)
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wc++2a-compat"
-#endif
-TEST(Split, UTF8) {
-  // Tests splitting utf8 strings and utf8 delimiters.
-  std::string utf8_string = u8"\u03BA\u1F79\u03C3\u03BC\u03B5";
-  {
-    // A utf8 input string with an ascii delimiter.
-    std::string to_split = "a," + utf8_string;
-    std::vector<absl::string_view> v = absl::StrSplit(to_split, ',');
-    EXPECT_THAT(v, ElementsAre("a", utf8_string));
-  }
-
-  {
-    // A utf8 input string and a utf8 delimiter.
-    std::string to_split = "a," + utf8_string + ",b";
-    std::string unicode_delimiter = "," + utf8_string + ",";
-    std::vector<absl::string_view> v =
-        absl::StrSplit(to_split, unicode_delimiter);
-    EXPECT_THAT(v, ElementsAre("a", "b"));
-  }
-
-  {
-    // A utf8 input string and ByAnyChar with ascii chars.
-    std::vector<absl::string_view> v =
-        absl::StrSplit(u8"Foo h\u00E4llo th\u4E1Ere", absl::ByAnyChar(" \t"));
-    EXPECT_THAT(v, ElementsAre("Foo", u8"h\u00E4llo", u8"th\u4E1Ere"));
-  }
-}
-#if defined(__clang__)
-#pragma clang diagnostic pop
-#endif
-#endif  // !defined(__cpp_char8_t)
-
-TEST(Split, EmptyStringDelimiter) {
-  {
-    std::vector<std::string> v = absl::StrSplit("", "");
-    EXPECT_THAT(v, ElementsAre(""));
-  }
-
-  {
-    std::vector<std::string> v = absl::StrSplit("a", "");
-    EXPECT_THAT(v, ElementsAre("a"));
-  }
-
-  {
-    std::vector<std::string> v = absl::StrSplit("ab", "");
-    EXPECT_THAT(v, ElementsAre("a", "b"));
-  }
-
-  {
-    std::vector<std::string> v = absl::StrSplit("a b", "");
-    EXPECT_THAT(v, ElementsAre("a", " ", "b"));
-  }
-}
-
-TEST(Split, SubstrDelimiter) {
-  std::vector<absl::string_view> results;
-  absl::string_view delim("//");
-
-  results = absl::StrSplit("", delim);
-  EXPECT_THAT(results, ElementsAre(""));
-
-  results = absl::StrSplit("//", delim);
-  EXPECT_THAT(results, ElementsAre("", ""));
-
-  results = absl::StrSplit("ab", delim);
-  EXPECT_THAT(results, ElementsAre("ab"));
-
-  results = absl::StrSplit("ab//", delim);
-  EXPECT_THAT(results, ElementsAre("ab", ""));
-
-  results = absl::StrSplit("ab/", delim);
-  EXPECT_THAT(results, ElementsAre("ab/"));
-
-  results = absl::StrSplit("a/b", delim);
-  EXPECT_THAT(results, ElementsAre("a/b"));
-
-  results = absl::StrSplit("a//b", delim);
-  EXPECT_THAT(results, ElementsAre("a", "b"));
-
-  results = absl::StrSplit("a///b", delim);
-  EXPECT_THAT(results, ElementsAre("a", "/b"));
-
-  results = absl::StrSplit("a////b", delim);
-  EXPECT_THAT(results, ElementsAre("a", "", "b"));
-}
-
-TEST(Split, EmptyResults) {
-  std::vector<absl::string_view> results;
-
-  results = absl::StrSplit("", '#');
-  EXPECT_THAT(results, ElementsAre(""));
-
-  results = absl::StrSplit("#", '#');
-  EXPECT_THAT(results, ElementsAre("", ""));
-
-  results = absl::StrSplit("#cd", '#');
-  EXPECT_THAT(results, ElementsAre("", "cd"));
-
-  results = absl::StrSplit("ab#cd#", '#');
-  EXPECT_THAT(results, ElementsAre("ab", "cd", ""));
-
-  results = absl::StrSplit("ab##cd", '#');
-  EXPECT_THAT(results, ElementsAre("ab", "", "cd"));
-
-  results = absl::StrSplit("ab##", '#');
-  EXPECT_THAT(results, ElementsAre("ab", "", ""));
-
-  results = absl::StrSplit("ab#ab#", '#');
-  EXPECT_THAT(results, ElementsAre("ab", "ab", ""));
-
-  results = absl::StrSplit("aaaa", 'a');
-  EXPECT_THAT(results, ElementsAre("", "", "", "", ""));
-
-  results = absl::StrSplit("", '#', absl::SkipEmpty());
-  EXPECT_THAT(results, ElementsAre());
-}
-
-template <typename Delimiter>
-static bool IsFoundAtStartingPos(absl::string_view text, Delimiter d,
-                                 size_t starting_pos, int expected_pos) {
-  absl::string_view found = d.Find(text, starting_pos);
-  return found.data() != text.data() + text.size() &&
-         expected_pos == found.data() - text.data();
-}
-
-// Helper function for testing Delimiter objects. Returns true if the given
-// Delimiter is found in the given string at the given position. This function
-// tests two cases:
-//   1. The actual text given, staring at position 0
-//   2. The text given with leading padding that should be ignored
-template <typename Delimiter>
-static bool IsFoundAt(absl::string_view text, Delimiter d, int expected_pos) {
-  const std::string leading_text = ",x,y,z,";
-  return IsFoundAtStartingPos(text, d, 0, expected_pos) &&
-         IsFoundAtStartingPos(leading_text + std::string(text), d,
-                              leading_text.length(),
-                              expected_pos + leading_text.length());
-}
-
-//
-// Tests for ByString
-//
-
-// Tests using any delimiter that represents a single comma.
-template <typename Delimiter>
-void TestComma(Delimiter d) {
-  EXPECT_TRUE(IsFoundAt(",", d, 0));
-  EXPECT_TRUE(IsFoundAt("a,", d, 1));
-  EXPECT_TRUE(IsFoundAt(",b", d, 0));
-  EXPECT_TRUE(IsFoundAt("a,b", d, 1));
-  EXPECT_TRUE(IsFoundAt("a,b,", d, 1));
-  EXPECT_TRUE(IsFoundAt("a,b,c", d, 1));
-  EXPECT_FALSE(IsFoundAt("", d, -1));
-  EXPECT_FALSE(IsFoundAt(" ", d, -1));
-  EXPECT_FALSE(IsFoundAt("a", d, -1));
-  EXPECT_FALSE(IsFoundAt("a b c", d, -1));
-  EXPECT_FALSE(IsFoundAt("a;b;c", d, -1));
-  EXPECT_FALSE(IsFoundAt(";", d, -1));
-}
-
-TEST(Delimiter, ByString) {
-  using absl::ByString;
-  TestComma(ByString(","));
-
-  // Works as named variable.
-  ByString comma_string(",");
-  TestComma(comma_string);
-
-  // The first occurrence of empty string ("") in a string is at position 0.
-  // There is a test below that demonstrates this for absl::string_view::find().
-  // If the ByString delimiter returned position 0 for this, there would
-  // be an infinite loop in the SplitIterator code. To avoid this, empty string
-  // is a special case in that it always returns the item at position 1.
-  absl::string_view abc("abc");
-  EXPECT_EQ(0, abc.find(""));  // "" is found at position 0
-  ByString empty("");
-  EXPECT_FALSE(IsFoundAt("", empty, 0));
-  EXPECT_FALSE(IsFoundAt("a", empty, 0));
-  EXPECT_TRUE(IsFoundAt("ab", empty, 1));
-  EXPECT_TRUE(IsFoundAt("abc", empty, 1));
-}
-
-TEST(Split, ByChar) {
-  using absl::ByChar;
-  TestComma(ByChar(','));
-
-  // Works as named variable.
-  ByChar comma_char(',');
-  TestComma(comma_char);
-}
-
-//
-// Tests for ByAnyChar
-//
-
-TEST(Delimiter, ByAnyChar) {
-  using absl::ByAnyChar;
-  ByAnyChar one_delim(",");
-  // Found
-  EXPECT_TRUE(IsFoundAt(",", one_delim, 0));
-  EXPECT_TRUE(IsFoundAt("a,", one_delim, 1));
-  EXPECT_TRUE(IsFoundAt("a,b", one_delim, 1));
-  EXPECT_TRUE(IsFoundAt(",b", one_delim, 0));
-  // Not found
-  EXPECT_FALSE(IsFoundAt("", one_delim, -1));
-  EXPECT_FALSE(IsFoundAt(" ", one_delim, -1));
-  EXPECT_FALSE(IsFoundAt("a", one_delim, -1));
-  EXPECT_FALSE(IsFoundAt("a;b;c", one_delim, -1));
-  EXPECT_FALSE(IsFoundAt(";", one_delim, -1));
-
-  ByAnyChar two_delims(",;");
-  // Found
-  EXPECT_TRUE(IsFoundAt(",", two_delims, 0));
-  EXPECT_TRUE(IsFoundAt(";", two_delims, 0));
-  EXPECT_TRUE(IsFoundAt(",;", two_delims, 0));
-  EXPECT_TRUE(IsFoundAt(";,", two_delims, 0));
-  EXPECT_TRUE(IsFoundAt(",;b", two_delims, 0));
-  EXPECT_TRUE(IsFoundAt(";,b", two_delims, 0));
-  EXPECT_TRUE(IsFoundAt("a;,", two_delims, 1));
-  EXPECT_TRUE(IsFoundAt("a,;", two_delims, 1));
-  EXPECT_TRUE(IsFoundAt("a;,b", two_delims, 1));
-  EXPECT_TRUE(IsFoundAt("a,;b", two_delims, 1));
-  // Not found
-  EXPECT_FALSE(IsFoundAt("", two_delims, -1));
-  EXPECT_FALSE(IsFoundAt(" ", two_delims, -1));
-  EXPECT_FALSE(IsFoundAt("a", two_delims, -1));
-  EXPECT_FALSE(IsFoundAt("a=b=c", two_delims, -1));
-  EXPECT_FALSE(IsFoundAt("=", two_delims, -1));
-
-  // ByAnyChar behaves just like ByString when given a delimiter of empty
-  // string. That is, it always returns a zero-length absl::string_view
-  // referring to the item at position 1, not position 0.
-  ByAnyChar empty("");
-  EXPECT_FALSE(IsFoundAt("", empty, 0));
-  EXPECT_FALSE(IsFoundAt("a", empty, 0));
-  EXPECT_TRUE(IsFoundAt("ab", empty, 1));
-  EXPECT_TRUE(IsFoundAt("abc", empty, 1));
-}
-
-//
-// Tests for ByLength
-//
-
-TEST(Delimiter, ByLength) {
-  using absl::ByLength;
-
-  ByLength four_char_delim(4);
-
-  // Found
-  EXPECT_TRUE(IsFoundAt("abcde", four_char_delim, 4));
-  EXPECT_TRUE(IsFoundAt("abcdefghijklmnopqrstuvwxyz", four_char_delim, 4));
-  EXPECT_TRUE(IsFoundAt("a b,c\nd", four_char_delim, 4));
-  // Not found
-  EXPECT_FALSE(IsFoundAt("", four_char_delim, 0));
-  EXPECT_FALSE(IsFoundAt("a", four_char_delim, 0));
-  EXPECT_FALSE(IsFoundAt("ab", four_char_delim, 0));
-  EXPECT_FALSE(IsFoundAt("abc", four_char_delim, 0));
-  EXPECT_FALSE(IsFoundAt("abcd", four_char_delim, 0));
-}
-
-TEST(Split, WorksWithLargeStrings) {
-  if (sizeof(size_t) > 4) {
-    std::string s((uint32_t{1} << 31) + 1, 'x');  // 2G + 1 byte
-    s.back() = '-';
-    std::vector<absl::string_view> v = absl::StrSplit(s, '-');
-    EXPECT_EQ(2, v.size());
-    // The first element will contain 2G of 'x's.
-    // testing::StartsWith is too slow with a 2G string.
-    EXPECT_EQ('x', v[0][0]);
-    EXPECT_EQ('x', v[0][1]);
-    EXPECT_EQ('x', v[0][3]);
-    EXPECT_EQ("", v[1]);
-  }
-}
-
-TEST(SplitInternalTest, TypeTraits) {
-  EXPECT_FALSE(absl::strings_internal::HasMappedType<int>::value);
-  EXPECT_TRUE(
-      (absl::strings_internal::HasMappedType<std::map<int, int>>::value));
-  EXPECT_FALSE(absl::strings_internal::HasValueType<int>::value);
-  EXPECT_TRUE(
-      (absl::strings_internal::HasValueType<std::map<int, int>>::value));
-  EXPECT_FALSE(absl::strings_internal::HasConstIterator<int>::value);
-  EXPECT_TRUE(
-      (absl::strings_internal::HasConstIterator<std::map<int, int>>::value));
-  EXPECT_FALSE(absl::strings_internal::IsInitializerList<int>::value);
-  EXPECT_TRUE((absl::strings_internal::IsInitializerList<
-               std::initializer_list<int>>::value));
-}
-
-}  // namespace