added Benchpress benchmarks

Author: nlohmann

.gitignore

@@ -2,3 +2,5 @@ json_unit
 html
 
 benchmark
+
+json_benchmarks

Makefile

@@ -9,7 +9,7 @@ all: json_unit
 
 # clean up
 clean:
-	rm -f json_unit
+	rm -f json_unit json_benchmarks
 
 # build unit tests
 json_unit: test/unit.cpp src/json.hpp test/catch.hpp
@@ -30,4 +30,9 @@ pretty:
 	   --indent-col1-comments --pad-oper --pad-header --align-pointer=type \
 	   --align-reference=type --add-brackets --convert-tabs --close-templates \
 	   --lineend=linux --preserve-date --suffix=none \
-	   src/json.hpp src/json.hpp.re2c test/unit.cpp
+	   src/json.hpp src/json.hpp.re2c test/unit.cpp benchmarks/benchmarks.cpp
+
+# benchmarks
+json_benchmarks: benchmarks/benchmarks.cpp benchmarks/benchpress.hpp benchmarks/cxxopts.hpp
+	$(CXX) -std=c++11 $(CXXFLAGS) -O3 -flto -I src -I benchmarks $< $(LDFLAGS) -o $@
+	./json_benchmarks

benchmarks/benchmarks.cpp

@@ -0,0 +1,71 @@
+#define BENCHPRESS_CONFIG_MAIN
+
+#include <fstream>
+#include <benchpress.hpp>
+#include <json.hpp>
+
+BENCHMARK("parse jeopardy.json", [](benchpress::context* ctx)
+{
+    for (size_t i = 0; i < ctx->num_iterations(); ++i)
+    {
+        std::ifstream input_file("benchmarks/files/jeopardy/jeopardy.json");
+        nlohmann::json j;
+        j << input_file;
+    }
+})
+
+BENCHMARK("parse canada.json", [](benchpress::context* ctx)
+{
+    for (size_t i = 0; i < ctx->num_iterations(); ++i)
+    {
+        std::ifstream input_file("benchmarks/files/nativejson-benchmark/canada.json");
+        nlohmann::json j;
+        j << input_file;
+    }
+})
+
+BENCHMARK("parse citm_catalog.json", [](benchpress::context* ctx)
+{
+    for (size_t i = 0; i < ctx->num_iterations(); ++i)
+    {
+        std::ifstream input_file("benchmarks/files/nativejson-benchmark/citm_catalog.json");
+        nlohmann::json j;
+        j << input_file;
+    }
+})
+
+BENCHMARK("parse twitter.json", [](benchpress::context* ctx)
+{
+    for (size_t i = 0; i < ctx->num_iterations(); ++i)
+    {
+        std::ifstream input_file("benchmarks/files/nativejson-benchmark/twitter.json");
+        nlohmann::json j;
+        j << input_file;
+    }
+})
+
+BENCHMARK("dump jeopardy.json", [](benchpress::context* ctx)
+{
+    std::ifstream input_file("benchmarks/files/jeopardy/jeopardy.json");
+    nlohmann::json j;
+    j << input_file;
+
+    ctx->reset_timer();
+    for (size_t i = 0; i < ctx->num_iterations(); ++i)
+    {
+        j.dump();
+    }
+})
+
+BENCHMARK("dump jeopardy.json with indent", [](benchpress::context* ctx)
+{
+    std::ifstream input_file("benchmarks/files/jeopardy/jeopardy.json");
+    nlohmann::json j;
+    j << input_file;
+
+    ctx->reset_timer();
+    for (size_t i = 0; i < ctx->num_iterations(); ++i)
+    {
+        j.dump(4);
+    }
+})