From 18045c4e32cbe6217224f46261b9e2607d6e723d Mon Sep 17 00:00:00 2001
From: Abseil Team <absl-team@google.com>
Date: Tue, 25 May 2021 13:13:33 -0700
Subject: Export of internal Abseil changes

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d74f30ef0da7139c30a24eb6c1776bc0c257e642 by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 375779441

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25e33cde30d78dbafcb81ee3ce77c3d70c74db5a by Abseil Team <absl-team@google.com>:

Internal change

PiperOrigin-RevId: 375520720

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46857d17d4dbc6fbd13a27dd82e14ec814dd117a by Samuel Benzaquen <sbenza@google.com>:

Add an explicit template parameter barrier to absl::HashOf.

PiperOrigin-RevId: 375103300

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cf2bf52b9a425b0360ed1f46778f0ef1326a3658 by Abseil Team <absl-team@google.com>:

Improve string_view API compliance with C++17 std::basic_string_view.

This adds missing overloads, default values, and constexpr specifiers.

PiperOrigin-RevId: 374885658

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41e55166dc5bd3ed7bce567c400781585d55e1ce by Derek Mauro <dmauro@google.com>:

Update CI to GCC 11.1, Bazel 4.0.0, CMake 3.20.2, and
LLVM git:7bcc0a1e399d461af7ec013ff33bc330a2de6641

PiperOrigin-RevId: 374858288
GitOrigin-RevId: d74f30ef0da7139c30a24eb6c1776bc0c257e642
Change-Id: I657c815c83522b030495ff54ca327e7012ed151e
---
 absl/hash/hash.h       |  2 +-
 absl/hash/hash_test.cc | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

(limited to 'absl/hash')

diff --git a/absl/hash/hash.h b/absl/hash/hash.h
index 69c44fde..8282ea53 100644
--- a/absl/hash/hash.h
+++ b/absl/hash/hash.h
@@ -230,7 +230,7 @@ using Hash = absl::hash_internal::Hash<T>;
 // The requirement that the arguments match in both type and value is critical.
 // It means that `a == b` does not necessarily imply `HashOf(a) == HashOf(b)` if
 // `a` and `b` have different types. For example, `HashOf(2) != HashOf(2.0)`.
-template <typename... Types>
+template <int&... ExplicitArgumentBarrier, typename... Types>
 size_t HashOf(const Types&... values) {
   auto tuple = std::tie(values...);
   return absl::Hash<decltype(tuple)>{}(tuple);
diff --git a/absl/hash/hash_test.cc b/absl/hash/hash_test.cc
index 02b7733d..b3ddebdd 100644
--- a/absl/hash/hash_test.cc
+++ b/absl/hash/hash_test.cc
@@ -995,4 +995,17 @@ TEST(HashOf, MatchesHashOfTupleForMultipleArguments) {
             absl::HashOf(std::make_tuple(hello, world)));
 }
 
+template <typename T>
+std::true_type HashOfExplicitParameter(decltype(absl::HashOf<T>(0))) {
+  return {};
+}
+template <typename T>
+std::false_type HashOfExplicitParameter(size_t) {
+  return {};
+}
+
+TEST(HashOf, CantPassExplicitTemplateParameters) {
+  EXPECT_FALSE(HashOfExplicitParameter<int>(0));
+}
+
 }  // namespace
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