370 lines
13 KiB
C++
370 lines
13 KiB
C++
// (C) Copyright Antony Polukhin, 2012-2019.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/config for most recent version.
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//
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// Testing lexical_cast<> performance
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//
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#define BOOST_ERROR_CODE_HEADER_ONLY
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#define BOOST_CHRONO_HEADER_ONLY
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#include <boost/lexical_cast.hpp>
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#include <boost/chrono.hpp>
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#include <fstream>
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#include <cstring>
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#include <boost/container/string.hpp>
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// File to output data
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std::fstream fout;
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namespace boost {
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inline std::istream& operator>> (std::istream& in, boost::array<char,50>& res) {
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in >> res.begin();
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return in;
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}
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}
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template <class OutT, class InT>
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static inline void test_lexical(const InT& in_val) {
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OutT out_val = boost::lexical_cast<OutT>(in_val);
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(void)out_val;
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}
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template <class OutT, class InT>
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static inline void test_ss_constr(const InT& in_val) {
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OutT out_val;
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std::stringstream ss;
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ss << in_val;
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if (ss.fail()) throw std::logic_error("descr");
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ss >> out_val;
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if (ss.fail()) throw std::logic_error("descr");
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}
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template <class OutT, class CharT, std::size_t N>
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static inline void test_ss_constr(const boost::array<CharT, N>& in_val) {
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OutT out_val;
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std::stringstream ss;
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ss << in_val.begin();
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if (ss.fail()) throw std::logic_error("descr");
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ss >> out_val;
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if (ss.fail()) throw std::logic_error("descr");
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}
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template <class OutT, class StringStreamT, class CharT, std::size_t N>
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static inline void test_ss_noconstr(StringStreamT& ss, const boost::array<CharT, N>& in_val) {
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OutT out_val;
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ss << in_val.begin(); // ss is an instance of std::stringstream
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if (ss.fail()) throw std::logic_error("descr");
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ss >> out_val;
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if (ss.fail()) throw std::logic_error("descr");
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/* reseting std::stringstream to use it again */
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ss.str(std::string());
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ss.clear();
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}
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template <class OutT, class StringStreamT, class InT>
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static inline void test_ss_noconstr(StringStreamT& ss, const InT& in_val) {
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OutT out_val;
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ss << in_val; // ss is an instance of std::stringstream
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if (ss.fail()) throw std::logic_error("descr");
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ss >> out_val;
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if (ss.fail()) throw std::logic_error("descr");
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/* reseting std::stringstream to use it again */
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ss.str(std::string());
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ss.clear();
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}
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struct structure_sprintf {
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template <class OutT, class BufferT, class InT>
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static inline void test(BufferT* buffer, const InT& in_val, const char* const conv) {
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sprintf(buffer, conv, in_val);
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OutT out_val(buffer);
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}
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template <class OutT, class BufferT>
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static inline void test(BufferT* buffer, const std::string& in_val, const char* const conv) {
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sprintf(buffer, conv, in_val.c_str());
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OutT out_val(buffer);
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}
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};
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struct structure_sscanf {
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template <class OutT, class BufferT, class CharT, std::size_t N>
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static inline void test(BufferT* /*buffer*/, const boost::array<CharT, N>& in_val, const char* const conv) {
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OutT out_val;
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sscanf(in_val.cbegin(), conv, &out_val);
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}
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template <class OutT, class BufferT, class InT>
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static inline void test(BufferT* /*buffer*/, const InT& in_val, const char* const conv) {
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OutT out_val;
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sscanf(reinterpret_cast<const char*>(in_val), conv, &out_val);
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}
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template <class OutT, class BufferT>
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static inline void test(BufferT* /*buffer*/, const std::string& in_val, const char* const conv) {
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OutT out_val;
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sscanf(in_val.c_str(), conv, &out_val);
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}
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template <class OutT, class BufferT>
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static inline void test(BufferT* /*buffer*/, const boost::iterator_range<const char*>& in_val, const char* const conv) {
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OutT out_val;
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sscanf(in_val.begin(), conv, &out_val);
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}
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};
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struct structure_fake {
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template <class OutT, class BufferT, class InT>
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static inline void test(BufferT* /*buffer*/, const InT& /*in_val*/, const char* const /*conv*/) {}
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};
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static const int fake_test_value = 9999;
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template <class T>
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static inline void min_fancy_output(T v1, T v2, T v3, T v4) {
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const char beg_mark[] = "!!! *";
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const char end_mark[] = "* !!!";
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const char no_mark[] = "";
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unsigned int res = 4;
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if (v1 < v2 && v1 < v3 && v1 < v4) res = 1;
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if (v2 < v1 && v2 < v3 && v2 < v4) res = 2;
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if (v3 < v1 && v3 < v2 && v3 < v4) res = 3;
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fout << "[ "
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<< (res == 1 ? beg_mark : no_mark)
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;
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if (v1) fout << v1;
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else fout << "<1";
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fout << (res == 1 ? end_mark : no_mark)
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<< " ][ "
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<< (res == 2 ? beg_mark : no_mark)
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;
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if (v2) fout << v2;
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else fout << "<1";
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fout << (res == 2 ? end_mark : no_mark)
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<< " ][ "
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<< (res == 3 ? beg_mark : no_mark)
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;
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if (v3) fout << v3;
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else fout << "<1";
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fout << (res == 3 ? end_mark : no_mark)
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<< " ][ "
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<< (res == 4 ? beg_mark : no_mark)
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;
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if (!v4) fout << "<1";
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else if (v4 == fake_test_value) fout << "---";
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else fout << v4;
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fout
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<< (res == 4 ? end_mark : no_mark)
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<< " ]";
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}
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template <unsigned int IetartionsCountV, class ToT, class SprintfT, class FromT>
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static inline void perf_test_impl(const FromT& in_val, const char* const conv) {
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typedef boost::chrono::steady_clock test_clock;
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test_clock::time_point start;
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typedef boost::chrono::milliseconds duration_t;
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duration_t lexical_cast_time, ss_constr_time, ss_noconstr_time, printf_time;
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start = test_clock::now();
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for (unsigned int i = 0; i < IetartionsCountV; ++i) {
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test_lexical<ToT>(in_val);
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test_lexical<ToT>(in_val);
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test_lexical<ToT>(in_val);
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test_lexical<ToT>(in_val);
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}
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lexical_cast_time = boost::chrono::duration_cast<duration_t>(test_clock::now() - start);
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start = test_clock::now();
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for (unsigned int i = 0; i < IetartionsCountV; ++i) {
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test_ss_constr<ToT>(in_val);
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test_ss_constr<ToT>(in_val);
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test_ss_constr<ToT>(in_val);
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test_ss_constr<ToT>(in_val);
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}
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ss_constr_time = boost::chrono::duration_cast<duration_t>(test_clock::now() - start);
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std::stringstream ss;
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start = test_clock::now();
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for (unsigned int i = 0; i < IetartionsCountV; ++i) {
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test_ss_noconstr<ToT>(ss, in_val);
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test_ss_noconstr<ToT>(ss, in_val);
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test_ss_noconstr<ToT>(ss, in_val);
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test_ss_noconstr<ToT>(ss, in_val);
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}
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ss_noconstr_time = boost::chrono::duration_cast<duration_t>(test_clock::now() - start);
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char buffer[128];
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start = test_clock::now();
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for (unsigned int i = 0; i < IetartionsCountV; ++i) {
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SprintfT::template test<ToT>(buffer, in_val, conv);
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SprintfT::template test<ToT>(buffer, in_val, conv);
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SprintfT::template test<ToT>(buffer, in_val, conv);
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SprintfT::template test<ToT>(buffer, in_val, conv);
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}
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printf_time = boost::chrono::duration_cast<duration_t>(test_clock::now() - start);
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min_fancy_output(
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lexical_cast_time.count(),
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ss_constr_time.count(),
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ss_noconstr_time.count(),
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boost::is_same<SprintfT, structure_fake>::value ? fake_test_value : printf_time.count()
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);
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}
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template <class ToT, class SprintfT, class FromT>
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static inline void perf_test(const std::string& test_name, const FromT& in_val, const char* const conv) {
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const unsigned int ITERATIONSCOUNT = 100000;
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fout << " [[ " << test_name << " ]";
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perf_test_impl<ITERATIONSCOUNT/4, ToT, SprintfT>(in_val, conv);
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fout << "]\n";
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}
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template <class ConverterT>
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void string_like_test_set(const std::string& from) {
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typedef structure_sscanf ssc_t;
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ConverterT conv;
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perf_test<char, ssc_t>(from + "->char", conv("c"), "%c");
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perf_test<signed char, ssc_t>(from + "->signed char", conv("c"), "%hhd");
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perf_test<unsigned char, ssc_t>(from + "->unsigned char", conv("c"), "%hhu");
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perf_test<int, ssc_t>(from + "->int", conv("100"), "%d");
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perf_test<short, ssc_t>(from + "->short", conv("100"), "%hd");
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perf_test<long int, ssc_t>(from + "->long int", conv("100"), "%ld");
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perf_test<boost::long_long_type, ssc_t>(from + "->long long", conv("100"), "%lld");
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perf_test<unsigned int, ssc_t>(from + "->unsigned int", conv("100"), "%u");
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perf_test<unsigned short, ssc_t>(from + "->unsigned short", conv("100"), "%hu");
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perf_test<unsigned long int, ssc_t>(from + "->unsigned long int", conv("100"), "%lu");
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perf_test<boost::ulong_long_type, ssc_t>(from + "->unsigned long long", conv("100"), "%llu");
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// perf_test<bool, ssc_t>(from + "->bool", conv("1"), "%");
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perf_test<float, ssc_t>(from + "->float", conv("1.123"), "%f");
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perf_test<double, ssc_t>(from + "->double", conv("1.123"), "%lf");
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perf_test<long double, ssc_t>(from + "->long double", conv("1.123"), "%Lf");
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perf_test<boost::array<char, 50>, ssc_t>(from + "->array<char, 50>", conv("1.123"), "%s");
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perf_test<std::string, structure_fake>(from + "->string", conv("string"), "%Lf");
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perf_test<boost::container::string, structure_fake>(from + "->container::string"
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, conv("string"), "%Lf");
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}
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struct to_string_conv {
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std::string operator()(const char* const c) const {
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return c;
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}
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};
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struct to_char_conv {
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const char* operator()(const char* const c) const {
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return c;
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}
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};
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struct to_uchar_conv {
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const unsigned char* operator()(const char* const c) const {
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return reinterpret_cast<const unsigned char*>(c);
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}
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};
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struct to_schar_conv {
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const signed char* operator()(const char* const c) const {
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return reinterpret_cast<const signed char*>(c);
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}
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};
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struct to_iterator_range {
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boost::iterator_range<const char*> operator()(const char* const c) const {
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return boost::make_iterator_range(c, c + std::strlen(c));
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}
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};
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struct to_array_50 {
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boost::array<char, 50> operator()(const char* const c) const {
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boost::array<char, 50> ret;
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std::strcpy(ret.begin(), c);
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return ret;
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}
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};
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int main(int argc, char** argv) {
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BOOST_ASSERT(argc >= 2);
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std::string output_path(argv[1]);
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output_path += "/results.txt";
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fout.open(output_path.c_str(), std::fstream::in | std::fstream::out | std::fstream::app);
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BOOST_ASSERT(fout);
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fout << "[section " << BOOST_COMPILER << "]\n"
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<< "[table:id Performance Table ( "<< BOOST_COMPILER << ")\n"
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<< "[[From->To] [lexical_cast] [std::stringstream with construction] "
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<< "[std::stringstream without construction][scanf/printf]]\n";
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// From std::string to ...
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string_like_test_set<to_string_conv>("string");
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// From ... to std::string
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perf_test<std::string, structure_sprintf>("string->char", 'c', "%c");
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perf_test<std::string, structure_sprintf>("string->signed char", static_cast<signed char>('c'), "%hhd");
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perf_test<std::string, structure_sprintf>("string->unsigned char", static_cast<unsigned char>('c'), "%hhu");
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perf_test<std::string, structure_sprintf>("int->string", 100, "%d");
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perf_test<std::string, structure_sprintf>("short->string", static_cast<short>(100), "%hd");
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perf_test<std::string, structure_sprintf>("long int->string", 100l, "%ld");
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perf_test<std::string, structure_sprintf>("long long->string", 100ll, "%lld");
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perf_test<std::string, structure_sprintf>("unsigned int->string", static_cast<unsigned short>(100u), "%u");
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perf_test<std::string, structure_sprintf>("unsigned short->string", 100u, "%hu");
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perf_test<std::string, structure_sprintf>("unsigned long int->string", 100ul, "%lu");
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perf_test<std::string, structure_sprintf>("unsigned long long->string", static_cast<boost::ulong_long_type>(100), "%llu");
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// perf_test<bool, structure_sscanf>("bool->string", std::string("1"), "%");
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perf_test<std::string, structure_sprintf>("float->string", 1.123f, "%f");
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perf_test<std::string, structure_sprintf>("double->string", 1.123, "%lf");
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perf_test<std::string, structure_sprintf>("long double->string", 1.123L, "%Lf");
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string_like_test_set<to_char_conv>("char*");
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string_like_test_set<to_uchar_conv>("unsigned char*");
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string_like_test_set<to_schar_conv>("signed char*");
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string_like_test_set<to_iterator_range>("iterator_range<char*>");
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string_like_test_set<to_array_50>("array<char, 50>");
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perf_test<int, structure_fake>("int->int", 100, "");
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perf_test<double, structure_fake>("float->double", 100.0f, "");
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perf_test<signed char, structure_fake>("char->signed char", 'c', "");
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fout << "]\n"
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<< "[endsect]\n\n";
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return 0;
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}
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