Squashed 'third_party/boostorg/lexical_cast/' content from commit 5bfe667
Change-Id: I518d0a0b83082059176813a98b80ad92892ac745
git-subtree-dir: third_party/boostorg/lexical_cast
git-subtree-split: 5bfe6672d467ebd8de5d911c07b2a931b43156de
diff --git a/perf/performance_test.cpp b/perf/performance_test.cpp
new file mode 100644
index 0000000..7fbac4f
--- /dev/null
+++ b/perf/performance_test.cpp
@@ -0,0 +1,369 @@
+// (C) Copyright Antony Polukhin 2012.
+// Use, modification and distribution are subject to the
+// Boost Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// See http://www.boost.org/libs/config for most recent version.
+
+//
+// Testing lexical_cast<> performance
+//
+
+#define BOOST_ERROR_CODE_HEADER_ONLY
+#define BOOST_CHRONO_HEADER_ONLY
+
+#include <boost/lexical_cast.hpp>
+
+#include <boost/chrono.hpp>
+#include <fstream>
+#include <cstring>
+#include <boost/container/string.hpp>
+
+// File to output data
+std::fstream fout;
+
+namespace boost {
+inline std::istream& operator>> (std::istream& in, boost::array<char,50>& res) {
+ in >> res.begin();
+ return in;
+}
+}
+
+template <class OutT, class InT>
+static inline void test_lexical(const InT& in_val) {
+ OutT out_val = boost::lexical_cast<OutT>(in_val);
+ (void)out_val;
+}
+
+template <class OutT, class InT>
+static inline void test_ss_constr(const InT& in_val) {
+ OutT out_val;
+ std::stringstream ss;
+ ss << in_val;
+ if (ss.fail()) throw std::logic_error("descr");
+ ss >> out_val;
+ if (ss.fail()) throw std::logic_error("descr");
+}
+
+template <class OutT, class CharT, std::size_t N>
+static inline void test_ss_constr(const boost::array<CharT, N>& in_val) {
+ OutT out_val;
+ std::stringstream ss;
+ ss << in_val.begin();
+ if (ss.fail()) throw std::logic_error("descr");
+ ss >> out_val;
+ if (ss.fail()) throw std::logic_error("descr");
+}
+
+template <class OutT, class StringStreamT, class CharT, std::size_t N>
+static inline void test_ss_noconstr(StringStreamT& ss, const boost::array<CharT, N>& in_val) {
+ OutT out_val;
+ ss << in_val.begin(); // ss is an instance of std::stringstream
+ if (ss.fail()) throw std::logic_error("descr");
+ ss >> out_val;
+ if (ss.fail()) throw std::logic_error("descr");
+ /* reseting std::stringstream to use it again */
+ ss.str(std::string());
+ ss.clear();
+}
+
+template <class OutT, class StringStreamT, class InT>
+static inline void test_ss_noconstr(StringStreamT& ss, const InT& in_val) {
+ OutT out_val;
+ ss << in_val; // ss is an instance of std::stringstream
+ if (ss.fail()) throw std::logic_error("descr");
+ ss >> out_val;
+ if (ss.fail()) throw std::logic_error("descr");
+ /* reseting std::stringstream to use it again */
+ ss.str(std::string());
+ ss.clear();
+}
+
+struct structure_sprintf {
+ template <class OutT, class BufferT, class InT>
+ static inline void test(BufferT* buffer, const InT& in_val, const char* const conv) {
+ sprintf(buffer, conv, in_val);
+ OutT out_val(buffer);
+ }
+
+ template <class OutT, class BufferT>
+ static inline void test(BufferT* buffer, const std::string& in_val, const char* const conv) {
+ sprintf(buffer, conv, in_val.c_str());
+ OutT out_val(buffer);
+ }
+};
+
+struct structure_sscanf {
+ template <class OutT, class BufferT, class CharT, std::size_t N>
+ static inline void test(BufferT* /*buffer*/, const boost::array<CharT, N>& in_val, const char* const conv) {
+ OutT out_val;
+ sscanf(in_val.cbegin(), conv, &out_val);
+ }
+
+ template <class OutT, class BufferT, class InT>
+ static inline void test(BufferT* /*buffer*/, const InT& in_val, const char* const conv) {
+ OutT out_val;
+ sscanf(reinterpret_cast<const char*>(in_val), conv, &out_val);
+ }
+
+ template <class OutT, class BufferT>
+ static inline void test(BufferT* /*buffer*/, const std::string& in_val, const char* const conv) {
+ OutT out_val;
+ sscanf(in_val.c_str(), conv, &out_val);
+ }
+
+ template <class OutT, class BufferT>
+ static inline void test(BufferT* /*buffer*/, const boost::iterator_range<const char*>& in_val, const char* const conv) {
+ OutT out_val;
+ sscanf(in_val.begin(), conv, &out_val);
+ }
+};
+
+struct structure_fake {
+ template <class OutT, class BufferT, class InT>
+ static inline void test(BufferT* /*buffer*/, const InT& /*in_val*/, const char* const /*conv*/) {}
+};
+
+static const int fake_test_value = 9999;
+
+template <class T>
+static inline void min_fancy_output(T v1, T v2, T v3, T v4) {
+ const char beg_mark[] = "!!! *";
+ const char end_mark[] = "* !!!";
+ const char no_mark[] = "";
+
+ unsigned int res = 4;
+ if (v1 < v2 && v1 < v3 && v1 < v4) res = 1;
+ if (v2 < v1 && v2 < v3 && v2 < v4) res = 2;
+ if (v3 < v1 && v3 < v2 && v3 < v4) res = 3;
+
+ fout << "[ "
+ << (res == 1 ? beg_mark : no_mark)
+ ;
+
+ if (v1) fout << v1;
+ else fout << "<1";
+
+ fout << (res == 1 ? end_mark : no_mark)
+ << " ][ "
+ << (res == 2 ? beg_mark : no_mark)
+ ;
+
+ if (v2) fout << v2;
+ else fout << "<1";
+
+ fout << (res == 2 ? end_mark : no_mark)
+ << " ][ "
+ << (res == 3 ? beg_mark : no_mark)
+ ;
+
+ if (v3) fout << v3;
+ else fout << "<1";
+
+ fout << (res == 3 ? end_mark : no_mark)
+ << " ][ "
+ << (res == 4 ? beg_mark : no_mark)
+ ;
+
+ if (!v4) fout << "<1";
+ else if (v4 == fake_test_value) fout << "---";
+ else fout << v4;
+
+ fout
+ << (res == 4 ? end_mark : no_mark)
+ << " ]";
+}
+
+template <unsigned int IetartionsCountV, class ToT, class SprintfT, class FromT>
+static inline void perf_test_impl(const FromT& in_val, const char* const conv) {
+
+ typedef boost::chrono::steady_clock test_clock;
+ test_clock::time_point start;
+ typedef boost::chrono::milliseconds duration_t;
+ duration_t lexical_cast_time, ss_constr_time, ss_noconstr_time, printf_time;
+
+ start = test_clock::now();
+ for (unsigned int i = 0; i < IetartionsCountV; ++i) {
+ test_lexical<ToT>(in_val);
+ test_lexical<ToT>(in_val);
+ test_lexical<ToT>(in_val);
+ test_lexical<ToT>(in_val);
+ }
+ lexical_cast_time = boost::chrono::duration_cast<duration_t>(test_clock::now() - start);
+
+
+ start = test_clock::now();
+ for (unsigned int i = 0; i < IetartionsCountV; ++i) {
+ test_ss_constr<ToT>(in_val);
+ test_ss_constr<ToT>(in_val);
+ test_ss_constr<ToT>(in_val);
+ test_ss_constr<ToT>(in_val);
+ }
+ ss_constr_time = boost::chrono::duration_cast<duration_t>(test_clock::now() - start);
+
+ std::stringstream ss;
+ start = test_clock::now();
+ for (unsigned int i = 0; i < IetartionsCountV; ++i) {
+ test_ss_noconstr<ToT>(ss, in_val);
+ test_ss_noconstr<ToT>(ss, in_val);
+ test_ss_noconstr<ToT>(ss, in_val);
+ test_ss_noconstr<ToT>(ss, in_val);
+ }
+ ss_noconstr_time = boost::chrono::duration_cast<duration_t>(test_clock::now() - start);
+
+
+ char buffer[128];
+ start = test_clock::now();
+ for (unsigned int i = 0; i < IetartionsCountV; ++i) {
+ SprintfT::template test<ToT>(buffer, in_val, conv);
+ SprintfT::template test<ToT>(buffer, in_val, conv);
+ SprintfT::template test<ToT>(buffer, in_val, conv);
+ SprintfT::template test<ToT>(buffer, in_val, conv);
+ }
+ printf_time = boost::chrono::duration_cast<duration_t>(test_clock::now() - start);
+
+ min_fancy_output(
+ lexical_cast_time.count(),
+ ss_constr_time.count(),
+ ss_noconstr_time.count(),
+ boost::is_same<SprintfT, structure_fake>::value ? fake_test_value : printf_time.count()
+ );
+}
+
+template <class ToT, class SprintfT, class FromT>
+static inline void perf_test(const std::string& test_name, const FromT& in_val, const char* const conv) {
+ const unsigned int ITERATIONSCOUNT = 100000;
+ fout << " [[ " << test_name << " ]";
+
+ perf_test_impl<ITERATIONSCOUNT/4, ToT, SprintfT>(in_val, conv);
+
+ fout << "]\n";
+}
+
+
+template <class ConverterT>
+void string_like_test_set(const std::string& from) {
+ typedef structure_sscanf ssc_t;
+ ConverterT conv;
+
+ perf_test<char, ssc_t>(from + "->char", conv("c"), "%c");
+ perf_test<signed char, ssc_t>(from + "->signed char", conv("c"), "%hhd");
+ perf_test<unsigned char, ssc_t>(from + "->unsigned char", conv("c"), "%hhu");
+
+ perf_test<int, ssc_t>(from + "->int", conv("100"), "%d");
+ perf_test<short, ssc_t>(from + "->short", conv("100"), "%hd");
+ perf_test<long int, ssc_t>(from + "->long int", conv("100"), "%ld");
+ perf_test<boost::long_long_type, ssc_t>(from + "->long long", conv("100"), "%lld");
+
+ perf_test<unsigned int, ssc_t>(from + "->unsigned int", conv("100"), "%u");
+ perf_test<unsigned short, ssc_t>(from + "->unsigned short", conv("100"), "%hu");
+ perf_test<unsigned long int, ssc_t>(from + "->unsigned long int", conv("100"), "%lu");
+ perf_test<boost::ulong_long_type, ssc_t>(from + "->unsigned long long", conv("100"), "%llu");
+
+ // perf_test<bool, ssc_t>(from + "->bool", conv("1"), "%");
+
+ perf_test<float, ssc_t>(from + "->float", conv("1.123"), "%f");
+ perf_test<double, ssc_t>(from + "->double", conv("1.123"), "%lf");
+ perf_test<long double, ssc_t>(from + "->long double", conv("1.123"), "%Lf");
+ perf_test<boost::array<char, 50>, ssc_t>(from + "->array<char, 50>", conv("1.123"), "%s");
+
+ perf_test<std::string, structure_fake>(from + "->string", conv("string"), "%Lf");
+ perf_test<boost::container::string, structure_fake>(from + "->container::string"
+ , conv("string"), "%Lf");
+
+}
+
+struct to_string_conv {
+ std::string operator()(const char* const c) const {
+ return c;
+ }
+};
+
+struct to_char_conv {
+ const char* operator()(const char* const c) const {
+ return c;
+ }
+};
+
+struct to_uchar_conv {
+ const unsigned char* operator()(const char* const c) const {
+ return reinterpret_cast<const unsigned char*>(c);
+ }
+};
+
+
+struct to_schar_conv {
+ const signed char* operator()(const char* const c) const {
+ return reinterpret_cast<const signed char*>(c);
+ }
+};
+
+struct to_iterator_range {
+ boost::iterator_range<const char*> operator()(const char* const c) const {
+ return boost::make_iterator_range(c, c + std::strlen(c));
+ }
+};
+
+struct to_array_50 {
+ boost::array<char, 50> operator()(const char* const c) const {
+ boost::array<char, 50> ret;
+ std::strcpy(ret.begin(), c);
+ return ret;
+ }
+};
+
+int main(int argc, char** argv) {
+ BOOST_ASSERT(argc >= 2);
+ std::string output_path(argv[1]);
+ output_path += "/results.txt";
+ fout.open(output_path.c_str(), std::fstream::in | std::fstream::out | std::fstream::app);
+ BOOST_ASSERT(fout);
+
+ fout << "[section " << BOOST_COMPILER << "]\n"
+ << "[table:id Performance Table ( "<< BOOST_COMPILER << ")\n"
+ << "[[From->To] [lexical_cast] [std::stringstream with construction] "
+ << "[std::stringstream without construction][scanf/printf]]\n";
+
+
+ // From std::string to ...
+ string_like_test_set<to_string_conv>("string");
+
+ // From ... to std::string
+ perf_test<std::string, structure_sprintf>("string->char", 'c', "%c");
+ perf_test<std::string, structure_sprintf>("string->signed char", static_cast<signed char>('c'), "%hhd");
+ perf_test<std::string, structure_sprintf>("string->unsigned char", static_cast<unsigned char>('c'), "%hhu");
+
+ perf_test<std::string, structure_sprintf>("int->string", 100, "%d");
+ perf_test<std::string, structure_sprintf>("short->string", static_cast<short>(100), "%hd");
+ perf_test<std::string, structure_sprintf>("long int->string", 100l, "%ld");
+ perf_test<std::string, structure_sprintf>("long long->string", 100ll, "%lld");
+
+ perf_test<std::string, structure_sprintf>("unsigned int->string", static_cast<unsigned short>(100u), "%u");
+ perf_test<std::string, structure_sprintf>("unsigned short->string", 100u, "%hu");
+ perf_test<std::string, structure_sprintf>("unsigned long int->string", 100ul, "%lu");
+ perf_test<std::string, structure_sprintf>("unsigned long long->string", static_cast<boost::ulong_long_type>(100), "%llu");
+
+ // perf_test<bool, structure_sscanf>("bool->string", std::string("1"), "%");
+
+ perf_test<std::string, structure_sprintf>("float->string", 1.123f, "%f");
+ perf_test<std::string, structure_sprintf>("double->string", 1.123, "%lf");
+ perf_test<std::string, structure_sprintf>("long double->string", 1.123L, "%Lf");
+
+
+ string_like_test_set<to_char_conv>("char*");
+ string_like_test_set<to_uchar_conv>("unsigned char*");
+ string_like_test_set<to_schar_conv>("signed char*");
+ string_like_test_set<to_iterator_range>("iterator_range<char*>");
+ string_like_test_set<to_array_50>("array<char, 50>");
+
+ perf_test<int, structure_fake>("int->int", 100, "");
+ perf_test<double, structure_fake>("float->double", 100.0f, "");
+ perf_test<signed char, structure_fake>("char->signed char", 'c', "");
+
+
+ fout << "]\n"
+ << "[endsect]\n\n";
+ return 0;
+}
+
+