From 66432fd04e3d62d6ebf7ab1d1049c1ff90614eb3 Mon Sep 17 00:00:00 2001
From: Konstantin Akimov <knstqq@gmail.com>
Date: Sun, 5 Nov 2023 23:36:12 +0700
Subject: [PATCH] fix: add cast to void to avoid gcc warning inside
 string_cast.cpp
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It fixes this warning:
```
bench/string_cast.cpp:85:84: warning: ignoring return value of ‘std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&) [with _CharT = char; _Traits = char_traits<char>; _Alloc = allocator<char>]’, declared with attribute ‘nodiscard’ [-Wunused-result]
```
---
 src/bench/string_cast.cpp | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/bench/string_cast.cpp b/src/bench/string_cast.cpp
index 56f929e7fb..8f08d12103 100644
--- a/src/bench/string_cast.cpp
+++ b/src/bench/string_cast.cpp
@@ -59,12 +59,12 @@ static void strings_1_tostring(benchmark::Bench& bench)
 static void strings_2_multi_lexical_cast(benchmark::Bench& bench)
 {
     int i{0};
-    bench.run([&] {
+    bench.run([&] { static_cast<void>(
         boost::lexical_cast<std::string>(i) +
         boost::lexical_cast<std::string>(i+1) +
         boost::lexical_cast<std::string>(i+2) +
         boost::lexical_cast<std::string>(i+3) +
-        boost::lexical_cast<std::string>(i+4);
+        boost::lexical_cast<std::string>(i+4));
         ++i;
     });
 }
@@ -72,8 +72,8 @@ static void strings_2_multi_lexical_cast(benchmark::Bench& bench)
 static void strings_2_multi_numberToString(benchmark::Bench& bench)
 {
     int i{0};
-    bench.run([&] {
-        NumberToString(i) + NumberToString(i+1) + NumberToString(i+2) + NumberToString(i+3) + NumberToString(i+4);
+    bench.run([&] { static_cast<void>(
+        NumberToString(i) + NumberToString(i+1) + NumberToString(i+2) + NumberToString(i+3) + NumberToString(i+4));
         ++i;
     });
 }
@@ -81,8 +81,8 @@ static void strings_2_multi_numberToString(benchmark::Bench& bench)
 static void strings_2_multi_tostring(benchmark::Bench& bench)
 {
     int i{0};
-    bench.run([&] {
-        ToString(i) + ToString(i+1) + ToString(i+2) + ToString(i+3) + ToString(i+4);
+    bench.run([&] { static_cast<void>(
+        ToString(i) + ToString(i+1) + ToString(i+2) + ToString(i+3) + ToString(i+4));
         ++i;
     });
 }