Use C++11 style instead of C++20

snappy_benchmark.cc

diff --git a/snappy_benchmark.cc b/snappy_benchmark.cc
index 90243a8..c76b24e 100644
--- a/snappy_benchmark.cc
+++ b/snappy_benchmark.cc
@@ -46,7 +46,7 @@
 
 void FilesAndLevels(::testing::Benchmark* benchmark) {
   for (int i = 0; i < ARRAYSIZE(kTestDataFiles); ++i) {
-    for (int level = snappy::CompressionOptions::MinCompressionLevel();
+    for (int/*level=*/snappy::CompressionOptions::MinCompressionLevel();
          level <= snappy::CompressionOptions::MaxCompressionLevel(); ++level) {
       benchmark->ArgPair(i, level);
     }
@@ -65,7 +65,7 @@
 
   std::string zcontents;
   snappy::Compress(contents.data(), contents.size(), &zcontents,
-                   snappy::CompressionOptions{.level = state.range(1)});
+                   snappy::CompressionOptions{/*level=*/state.range(1)});
   char* dst = new char[contents.size()];
 
   for (auto s : state) {
@@ -130,7 +130,7 @@
 
   std::string zcontents;
   snappy::Compress(contents.data(), contents.size(), &zcontents,
-                   snappy::CompressionOptions{.level = state.range(1)});
+                   snappy::CompressionOptions{/*level=*/state.range(1)});
 
   for (auto s : state) {
     CHECK(snappy::IsValidCompressedBuffer(zcontents.data(), zcontents.size()));
@@ -163,7 +163,7 @@
 void BM_UIOVecSource(benchmark::State& state) {
   // Pick file to process based on state.range(0).
   int file_index = state.range(0);
-  int level = state.range(1);
+  int/*level=*/state.range(1);
 
   CHECK_GE(file_index, 0);
   CHECK_LT(file_index, ARRAYSIZE(kTestDataFiles));
@@ -193,7 +193,7 @@
   size_t zsize = 0;
   for (auto s : state) {
     snappy::RawCompressFromIOVec(iov, contents.size(), dst, &zsize,
-                                 snappy::CompressionOptions{.level = level});
+                                 snappy::CompressionOptions{/*level=*/level});
     benchmark::DoNotOptimize(iov);
   }
   state.SetBytesProcessed(static_cast<int64_t>(state.iterations()) *
@@ -268,7 +268,7 @@
 
   std::string zcontents;
   snappy::Compress(contents.data(), contents.size(), &zcontents,
-                   snappy::CompressionOptions{.level = state.range(1)});
+                   snappy::CompressionOptions{/*level=*/state.range(1)});
   char* dst = new char[contents.size()];
 
   for (auto s : state) {
@@ -292,7 +292,7 @@
 void BM_ZFlat(benchmark::State& state) {
   // Pick file to process based on state.range(0).
   int file_index = state.range(0);
-  int level = state.range(1);
+  int/*level=*/state.range(1);
 
   CHECK_GE(file_index, 0);
   CHECK_LT(file_index, ARRAYSIZE(kTestDataFiles));
@@ -304,7 +304,7 @@
   size_t zsize = 0;
   for (auto s : state) {
     snappy::RawCompress(contents.data(), contents.size(), dst, &zsize,
-                        snappy::CompressionOptions{.level = level});
+                        snappy::CompressionOptions{/*level=*/level});
     benchmark::DoNotOptimize(dst);
   }
   state.SetBytesProcessed(static_cast<int64_t>(state.iterations()) *
@@ -323,7 +323,7 @@
 
 void BM_ZFlatAll(benchmark::State& state) {
   const int num_files = ARRAYSIZE(kTestDataFiles);
-  int level = state.range(0);
+  int/*level=*/state.range(0);
 
   std::vector<std::string> contents(num_files);
   std::vector<char*> dst(num_files);
@@ -340,7 +340,7 @@
   for (auto s : state) {
     for (int i = 0; i < num_files; ++i) {
       snappy::RawCompress(contents[i].data(), contents[i].size(), dst[i],
-                          &zsize, snappy::CompressionOptions{.level = level});
+                          &zsize, snappy::CompressionOptions{/*level=*/level});
       benchmark::DoNotOptimize(dst);
     }
   }
@@ -357,7 +357,7 @@
 
 void BM_ZFlatIncreasingTableSize(benchmark::State& state) {
   CHECK_GT(ARRAYSIZE(kTestDataFiles), 0);
-  int level = state.range(0);
+  int/*level=*/state.range(0);
   const std::string base_content = ReadTestDataFile(
       kTestDataFiles[0].filename, kTestDataFiles[0].size_limit);
 
@@ -377,7 +377,7 @@
   for (auto s : state) {
     for (size_t i = 0; i < contents.size(); ++i) {
       snappy::RawCompress(contents[i].data(), contents[i].size(), dst[i],
-                          &zsize, snappy::CompressionOptions{.level = level});
+                          &zsize, snappy::CompressionOptions{/*level=*/level});
       benchmark::DoNotOptimize(dst);
     }
   }

snappy_compress_fuzzer.cc

diff --git a/snappy_compress_fuzzer.cc b/snappy_compress_fuzzer.cc
index 144f438..93254a2 100644
--- a/snappy_compress_fuzzer.cc
+++ b/snappy_compress_fuzzer.cc
@@ -44,7 +44,7 @@
     std::string compressed;
     size_t compressed_size =
         snappy::Compress(input.data(), input.size(), &compressed,
-                         snappy::CompressionOptions{.level = level});
+                         snappy::CompressionOptions{/*level=*/level});
 
     (void)compressed_size;  // Variable only used in debug builds.
     assert(compressed_size == compressed.size());