From e945c8d98719d2cca66ef1f0b83696becfa6a880 Mon Sep 17 00:00:00 2001
From: Abseil Team <absl-team@google.com>
Date: Tue, 1 Aug 2023 15:23:59 -0700
Subject: Implement AbslStringify for crc32c_t in order to support
 absl::StrFormat natively

PiperOrigin-RevId: 552940359
Change-Id: I925764757404c0c9f2a13ed729190d51f4ac46cf
---
 absl/crc/BUILD.bazel    |  1 +
 absl/crc/CMakeLists.txt |  1 +
 absl/crc/crc32c.h       |  5 +++++
 absl/crc/crc32c_test.cc | 14 ++++++++++++++
 4 files changed, 21 insertions(+)

(limited to 'absl')

diff --git a/absl/crc/BUILD.bazel b/absl/crc/BUILD.bazel
index 29a9964f..cdbaa9b2 100644
--- a/absl/crc/BUILD.bazel
+++ b/absl/crc/BUILD.bazel
@@ -106,6 +106,7 @@ cc_test(
     deps = [
         ":crc32c",
         "//absl/strings",
+        "//absl/strings:str_format",
         "@com_google_googletest//:gtest_main",
     ],
 )
diff --git a/absl/crc/CMakeLists.txt b/absl/crc/CMakeLists.txt
index f49b4b0b..21247160 100644
--- a/absl/crc/CMakeLists.txt
+++ b/absl/crc/CMakeLists.txt
@@ -91,6 +91,7 @@ absl_cc_test(
   DEPS
     absl::crc32c
     absl::strings
+    absl::str_format
     GTest::gtest_main
 )
 
diff --git a/absl/crc/crc32c.h b/absl/crc/crc32c.h
index 69799c8b..362861e4 100644
--- a/absl/crc/crc32c.h
+++ b/absl/crc/crc32c.h
@@ -62,6 +62,11 @@ class crc32c_t final {
 
   friend bool operator!=(crc32c_t lhs, crc32c_t rhs) { return !(lhs == rhs); }
 
+  template <typename Sink>
+  friend void AbslStringify(Sink& sink, crc32c_t crc) {
+    absl::Format(&sink, "%08x", static_cast<uint32_t>(crc));
+  }
+
  private:
   uint32_t crc_;
 };
diff --git a/absl/crc/crc32c_test.cc b/absl/crc/crc32c_test.cc
index 635424aa..df0afb3e 100644
--- a/absl/crc/crc32c_test.cc
+++ b/absl/crc/crc32c_test.cc
@@ -24,6 +24,7 @@
 #include "gtest/gtest.h"
 #include "absl/crc/internal/crc32c.h"
 #include "absl/strings/str_cat.h"
+#include "absl/strings/str_format.h"
 #include "absl/strings/string_view.h"
 
 namespace {
@@ -210,4 +211,17 @@ TEST(CRC32C, InsertionOperator) {
     EXPECT_EQ(buf.str(), "00000011");
   }
 }
+
+TEST(CRC32C, AbslStringify) {
+  // StrFormat
+  EXPECT_EQ(absl::StrFormat("%v", absl::crc32c_t{0xc99465aa}), "c99465aa");
+  EXPECT_EQ(absl::StrFormat("%v", absl::crc32c_t{0}), "00000000");
+  EXPECT_EQ(absl::StrFormat("%v", absl::crc32c_t{17}), "00000011");
+
+  // StrCat
+  EXPECT_EQ(absl::StrCat(absl::crc32c_t{0xc99465aa}), "c99465aa");
+  EXPECT_EQ(absl::StrCat(absl::crc32c_t{0}), "00000000");
+  EXPECT_EQ(absl::StrCat(absl::crc32c_t{17}), "00000011");
+}
+
 }  // namespace
-- 
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