From 7d4e17224a4b5d87ebf72bfe3241b424381fd3e7 Mon Sep 17 00:00:00 2001
From: Michael Carroll <michael@openrobotics.org>
Date: Tue, 18 Feb 2020 12:19:56 -0600
Subject: [PATCH] Correct std::hash return type sizes (#102)

Signed-off-by: Michael Carroll <michael@openrobotics.org>
---
 rmw_cyclonedds_cpp/src/serdata.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/rmw_cyclonedds_cpp/src/serdata.cpp b/rmw_cyclonedds_cpp/src/serdata.cpp
index db3f783..c6d9b5f 100644
--- a/rmw_cyclonedds_cpp/src/serdata.cpp
+++ b/rmw_cyclonedds_cpp/src/serdata.cpp
@@ -465,8 +465,10 @@ bool sertopic_rmw_equal(
 uint32_t sertopic_rmw_hash(const struct ddsi_sertopic * tpcmn)
 {
   const struct sertopic_rmw * tp = static_cast<const struct sertopic_rmw *>(tpcmn);
-  uint32_t h2 = std::hash<bool>{} (tp->is_request_header);
-  uint32_t h1 = std::hash<std::string>{} (std::string(tp->type_support.typesupport_identifier_));
+  uint32_t h2 = static_cast<uint32_t>(std::hash<bool>{} (tp->is_request_header));
+  uint32_t h1 =
+    static_cast<uint32_t>(std::hash<std::string>{} (std::string(
+      tp->type_support.typesupport_identifier_)));
   return h1 ^ h2;
 }
 #endif