Fix "unsafe narrowing" warnings in absl, 3/n.

Addresses failures with the following, in some files:
-Wshorten-64-to-32
-Wimplicit-int-conversion
-Wsign-compare
-Wsign-conversion
-Wtautological-unsigned-zero-compare

(This specific CL focuses on .cc files in dirs n-t, except string.)

Bug: chromium:1292951
PiperOrigin-RevId: 465287204
Change-Id: I0fe98ff78bf3c08d86992019eb626755f8b6803e

1 files changed, 18 insertions, 12 deletions

diff --git a/absl/status/status.cc b/absl/status/status.cc
index 88e8eda9..bbf2335d 100644
--- a/absl/status/status.cc
+++ b/absl/status/status.cc
@@ -16,6 +16,7 @@
 #include <errno.h>
 
 #include <cassert>
+#include <utility>
 
 #include "absl/base/internal/raw_logging.h"
 #include "absl/base/internal/strerror.h"
@@ -77,15 +78,17 @@ std::ostream& operator<<(std::ostream& os, StatusCode code) {
 
 namespace status_internal {
 
-static int FindPayloadIndexByUrl(const Payloads* payloads,
-                                 absl::string_view type_url) {
-  if (payloads == nullptr) return -1;
+static absl::optional<size_t> FindPayloadIndexByUrl(
+    const Payloads* payloads,
+    absl::string_view type_url) {
+  if (payloads == nullptr)
+    return absl::nullopt;
 
   for (size_t i = 0; i < payloads->size(); ++i) {
     if ((*payloads)[i].type_url == type_url) return i;
   }
 
-  return -1;
+  return absl::nullopt;
 }
 
 // Convert canonical code to a value known to this binary.
@@ -119,8 +122,10 @@ absl::StatusCode MapToLocalCode(int value) {
 absl::optional<absl::Cord> Status::GetPayload(
     absl::string_view type_url) const {
   const auto* payloads = GetPayloads();
-  int index = status_internal::FindPayloadIndexByUrl(payloads, type_url);
-  if (index != -1) return (*payloads)[index].payload;
+  absl::optional<size_t> index =
+      status_internal::FindPayloadIndexByUrl(payloads, type_url);
+  if (index.has_value())
+    return (*payloads)[index.value()].payload;
 
   return absl::nullopt;
 }
@@ -135,10 +140,10 @@ void Status::SetPayload(absl::string_view type_url, absl::Cord payload) {
     rep->payloads = absl::make_unique<status_internal::Payloads>();
   }
 
-  int index =
+  absl::optional<size_t> index =
       status_internal::FindPayloadIndexByUrl(rep->payloads.get(), type_url);
-  if (index != -1) {
-    (*rep->payloads)[index].payload = std::move(payload);
+  if (index.has_value()) {
+    (*rep->payloads)[index.value()].payload = std::move(payload);
     return;
   }
 
@@ -146,10 +151,11 @@ void Status::SetPayload(absl::string_view type_url, absl::Cord payload) {
 }
 
 bool Status::ErasePayload(absl::string_view type_url) {
-  int index = status_internal::FindPayloadIndexByUrl(GetPayloads(), type_url);
-  if (index != -1) {
+  absl::optional<size_t> index =
+      status_internal::FindPayloadIndexByUrl(GetPayloads(), type_url);
+  if (index.has_value()) {
     PrepareToModify();
-    GetPayloads()->erase(GetPayloads()->begin() + index);
+    GetPayloads()->erase(GetPayloads()->begin() + index.value());
     if (GetPayloads()->empty() && message().empty()) {
       // Special case: If this can be represented inlined, it MUST be
       // inlined (EqualsSlow depends on this behavior).