Add 'tomlplusplus/' from commit '1c8b7466e4946fcc3bf20484c0e1d001202cca5a'

git-subtree-dir: tomlplusplus
git-subtree-mainline: b85e90fc3480da0e6a48da73201a0b22488cc650
git-subtree-split: 1c8b7466e4946fcc3bf20484c0e1d001202cca5a

1 files changed, 81 insertions, 0 deletions

diff --git a/tomlplusplus/examples/parse_benchmark.cpp b/tomlplusplus/examples/parse_benchmark.cpp
new file mode 100644
index 0000000000..8c2b53d92e
--- /dev/null
+++ b/tomlplusplus/examples/parse_benchmark.cpp
@@ -0,0 +1,81 @@
+// This file is a part of toml++ and is subject to the the terms of the MIT license.
+// Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
+// See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
+// SPDX-License-Identifier: MIT
+
+// This example is just a short-n-shiny benchmark.
+
+#include "examples.hpp"
+#include <toml++/toml.hpp>
+
+using namespace std::string_view_literals;
+
+static constexpr size_t iterations = 10000;
+
+int main(int argc, char** argv)
+{
+	const auto file_path = std::string(argc > 1 ? std::string_view{ argv[1] } : "benchmark_data.toml"sv);
+
+	// read the file into a string first to remove file I/O from the benchmark
+	std::string file_content;
+	{
+		std::ifstream file(file_path, std::ifstream::in | std::ifstream::binary | std::ifstream::ate);
+		if (!file)
+		{
+			std::cerr << "File '"sv << file_path << "'could not be opened for reading\n"sv;
+			return -1;
+		}
+
+		const auto file_size = file.tellg();
+		if (file_size == -1)
+		{
+			std::cerr << "File '"sv << file_path << "' could not be opened for reading\n"sv;
+			return -1;
+		}
+		file.seekg(0, std::ifstream::beg);
+
+		file_content.resize(static_cast<size_t>(file_size));
+		file.read(file_content.data(), static_cast<std::streamsize>(file_size));
+		if (!file.eof() && !file)
+		{
+			std::cerr << "Failed to read contents of file '"sv << file_path << "'\n"sv;
+			return -1;
+		}
+	}
+
+	// parse once to make sure it isn't garbage
+	{
+#if TOML_EXCEPTIONS
+		try
+		{
+			const auto result = toml::parse(file_content, file_path);
+		}
+		catch (const toml::parse_error& err)
+		{
+			std::cerr << err << "\n";
+			return 1;
+		}
+#else
+		const auto result = toml::parse(file_content, file_path);
+		if (!result)
+		{
+			std::cerr << result.error() << "\n";
+			return 1;
+		}
+#endif
+	}
+
+	// run the benchmark
+	std::cout << "Parsing '"sv << file_path << "' "sv << iterations << " times...\n"sv;
+
+	const auto start = std::chrono::steady_clock::now();
+	for (size_t i = 0; i < iterations; i++)
+		std::ignore = toml::parse(file_content, file_path);
+	const auto cumulative_sec =
+		std::chrono::duration_cast<std::chrono::duration<double>>(std::chrono::steady_clock::now() - start).count();
+	const auto mean_sec = cumulative_sec / static_cast<double>(iterations);
+	std::cout << "  total: "sv << cumulative_sec << " s\n"sv
+			  << "   mean: "sv << mean_sec << " s\n"sv;
+
+	return 0;
+}