Support for int128 to string type conversion.

PiperOrigin-RevId: 542269673
Change-Id: Ib6f7e9a57f83d73dd6fb9c45fc9f85ff0fdd75fe

1 files changed, 17 insertions, 0 deletions

diff --git a/absl/numeric/int128.h b/absl/numeric/int128.h
index aa0f86f7..7530a793 100644
--- a/absl/numeric/int128.h
+++ b/absl/numeric/int128.h
@@ -32,6 +32,7 @@
 #include <cstring>
 #include <iosfwd>
 #include <limits>
+#include <string>
 #include <utility>
 
 #include "absl/base/config.h"
@@ -217,9 +218,17 @@ class
     return H::combine(std::move(h), Uint128High64(v), Uint128Low64(v));
   }
 
+  // Support for absl::StrCat() etc.
+  template <typename Sink>
+  friend void AbslStringify(Sink& sink, uint128 v) {
+    sink.Append(v.ToString());
+  }
+
  private:
   constexpr uint128(uint64_t high, uint64_t low);
 
+  std::string ToString() const;
+
   // TODO(strel) Update implementation to use __int128 once all users of
   // uint128 are fixed to not depend on alignof(uint128) == 8. Also add
   // alignas(16) to class definition to keep alignment consistent across
@@ -454,9 +463,17 @@ class int128 {
     return H::combine(std::move(h), Int128High64(v), Int128Low64(v));
   }
 
+  // Support for absl::StrCat() etc.
+  template <typename Sink>
+  friend void AbslStringify(Sink& sink, int128 v) {
+    sink.Append(v.ToString());
+  }
+
  private:
   constexpr int128(int64_t high, uint64_t low);
 
+  std::string ToString() const;
+
 #if defined(ABSL_HAVE_INTRINSIC_INT128)
   __int128 v_;
 #else  // ABSL_HAVE_INTRINSIC_INT128