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+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/ostringstream.h"
+
+#include <sstream>
+#include <string>
+
+#include "benchmark/benchmark.h"
+
+namespace {
+
+enum StringType {
+ kNone,
+ kStdString,
+};
+
+// Benchmarks for std::ostringstream.
+template <StringType kOutput>
+void BM_StdStream(benchmark::State& state) {
+ const int num_writes = state.range(0);
+ const int bytes_per_write = state.range(1);
+ const std::string payload(bytes_per_write, 'x');
+ for (auto _ : state) {
+ std::ostringstream strm;
+ benchmark::DoNotOptimize(strm);
+ for (int i = 0; i != num_writes; ++i) {
+ strm << payload;
+ }
+ switch (kOutput) {
+ case kNone: {
+ break;
+ }
+ case kStdString: {
+ std::string s = strm.str();
+ benchmark::DoNotOptimize(s);
+ break;
+ }
+ }
+ }
+}
+
+// Create the stream, optionally write to it, then destroy it.
+BENCHMARK_TEMPLATE(BM_StdStream, kNone)
+ ->ArgPair(0, 0)
+ ->ArgPair(1, 16) // 16 bytes is small enough for SSO
+ ->ArgPair(1, 256) // 256 bytes requires heap allocation
+ ->ArgPair(1024, 256);
+// Create the stream, write to it, get std::string out, then destroy.
+BENCHMARK_TEMPLATE(BM_StdStream, kStdString)
+ ->ArgPair(1, 16) // 16 bytes is small enough for SSO
+ ->ArgPair(1, 256) // 256 bytes requires heap allocation
+ ->ArgPair(1024, 256);
+
+// Benchmarks for OStringStream.
+template <StringType kOutput>
+void BM_CustomStream(benchmark::State& state) {
+ const int num_writes = state.range(0);
+ const int bytes_per_write = state.range(1);
+ const std::string payload(bytes_per_write, 'x');
+ for (auto _ : state) {
+ std::string out;
+ absl::strings_internal::OStringStream strm(&out);
+ benchmark::DoNotOptimize(strm);
+ for (int i = 0; i != num_writes; ++i) {
+ strm << payload;
+ }
+ switch (kOutput) {
+ case kNone: {
+ break;
+ }
+ case kStdString: {
+ std::string s = out;
+ benchmark::DoNotOptimize(s);
+ break;
+ }
+ }
+ }
+}
+
+// Create the stream, optionally write to it, then destroy it.
+BENCHMARK_TEMPLATE(BM_CustomStream, kNone)
+ ->ArgPair(0, 0)
+ ->ArgPair(1, 16) // 16 bytes is small enough for SSO
+ ->ArgPair(1, 256) // 256 bytes requires heap allocation
+ ->ArgPair(1024, 256);
+// Create the stream, write to it, get std::string out, then destroy.
+// It's not useful in practice to extract std::string from OStringStream; we
+// measure it for completeness.
+BENCHMARK_TEMPLATE(BM_CustomStream, kStdString)
+ ->ArgPair(1, 16) // 16 bytes is small enough for SSO
+ ->ArgPair(1, 256) // 256 bytes requires heap allocation
+ ->ArgPair(1024, 256);
+
+} // namespace