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// Boost.Convert test and usage example
// Copyright (c) 2009-2020 Vladimir Batov.
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
#include "./test.hpp"
#if !defined(BOOST_CONVERT_CXX14) || defined(BOOST_NO_CXX17_HDR_CHARCONV)
int main(int, char const* []) { return 0; }
#else
#include "./prepare.hpp"
#include <boost/convert.hpp>
#include <boost/convert/stream.hpp>
#include <boost/convert/printf.hpp>
#include <boost/convert/strtol.hpp>
#include <boost/convert/spirit.hpp>
#include <boost/convert/charconv.hpp>
#include <boost/convert/lexical_cast.hpp>
#include <boost/timer/timer.hpp>
#include <boost/random/mersenne_twister.hpp>
#include <boost/random/uniform_int_distribution.hpp>
#include <array>
using std::string;
using boost::convert;
namespace cnv = boost::cnv;
namespace arg = boost::cnv::parameter;
namespace { namespace local
{
template<typename Type>
struct array
{
using type = std::array<Type, 20>;
};
template<typename T> static typename array<T>::type const& get();
int BOOST_CONSTEXPR_OR_CONST num_cycles = 1000000;
int sum = 0;
struct timer : boost::timer::cpu_timer
{
using this_type = timer;
using base_type = boost::timer::cpu_timer;
double value() const
{
boost::timer::cpu_times times = base_type::elapsed();
int const use_sum = (sum % 2) ? 0 : (sum % 2); BOOST_TEST(use_sum == 0);
return double(times.user + times.system) / 1000000000 + use_sum;
}
};
template< typename Type, typename Cnv> static double str_to (Cnv const&);
template<typename S, typename Type, typename Cnv> static double to_str (Cnv const&);
template<>
local::array<int>::type const&
get<int>()
{
static array<int>::type ints;
static bool filled;
if (!filled)
{
boost::random::mt19937 gen (::time(0));
boost::random::uniform_int_distribution<> dist (INT_MIN, INT_MAX); // INT_MAX(32) = 2,147,483,647
for (size_t k = 0; k < ints.size(); ++k)
ints[k] = dist(gen);
filled = true;
}
return ints;
}
template<>
array<long int>::type const&
get<long int>()
{
static array<long int>::type ints;
static bool filled;
if (!filled)
{
boost::random::mt19937 gen (::time(0));
boost::random::uniform_int_distribution<> dist (INT_MIN, INT_MAX); // INT_MAX(32) = 2147483647
for (size_t k = 0; k < ints.size(); ++k)
ints[k] = dist(gen);
filled = true;
}
return ints;
}
template<>
array<double>::type const&
get<double>()
{
static array<double>::type dbls;
static bool filled;
if (!filled)
{
boost::random::mt19937 gen (::time(0));
boost::random::uniform_int_distribution<> dist (INT_MIN, INT_MAX); // INT_MAX(32) = 2147483647
for (size_t k = 0; k < dbls.size(); ++k)
dbls[k] = double(dist(gen)) + 0.7654321;
filled = true;
}
return dbls;
}
}}
struct raw_str_to_int_spirit
{
int operator()(char const* str) const
{
char const* beg = str;
char const* end = beg + strlen(str);
int result;
if (boost::spirit::qi::parse(beg, end, boost::spirit::int_, result))
if (beg == end) // ensure the whole string was parsed
return result;
return (BOOST_ASSERT(0), result);
}
};
struct raw_str_to_int_lxcast
{
int operator()(char const* str) const
{
return boost::lexical_cast<int>(str);
}
};
struct raw_str_to_int_charconv
{
int operator()(char const* str) const
{
char const* beg = str;
char const* end = beg + strlen(str);
int result;
const auto [ptr, ec] = std::from_chars(beg, end, result);
if (ptr == end) // ensure the whole string was parsed
return result;
return (BOOST_ASSERT(0), result);
}
};
template<typename Type, typename Converter>
double
raw_str_to(Converter const& cnv)
{
auto strings = local::get_strs(); // Create strings on the stack
int size = strings.size();
auto timer = local::timer();
for (int t = 0; t < local::num_cycles; ++t)
for (int k = 0; k < size; ++k)
local::sum += cnv(strings[k].c_str());
return timer.value();
}
template<typename Type, typename Converter>
double
local::str_to(Converter const& try_converter)
{
auto strings = local::get_strs(); // Create strings on the stack
int size = strings.size();
auto timer = local::timer();
for (int t = 0; t < local::num_cycles; ++t)
for (int k = 0; k < size; ++k)
local::sum += boost::convert<Type>(strings[k].c_str(), try_converter).value();
return timer.value();
}
template<typename string_type, typename Type, typename Converter>
double
local::to_str(Converter const& try_converter)
{
auto values = local::get<Type>();
int size = values.size();
auto timer = local::timer();
for (int t = 0; t < local::num_cycles; ++t)
for (int k = 0; k < size; ++k)
local::sum += *boost::convert<string_type>(Type(values[k]), try_converter).value().begin();
return timer.value();
}
template<typename Converter>
double
performance_str_to_type(Converter const& try_converter)
{
char const* input[] = { "no", "up", "dn" };
local::timer timer;
for (int k = 0; k < local::num_cycles; ++k)
{
change chg = boost::convert<change>(input[k % 3], try_converter).value();
int res = chg.value();
BOOST_TEST(res == k % 3);
local::sum += res; // Make sure chg is not optimized out
}
return timer.value();
}
template<typename Converter>
double
performance_type_to_str(Converter const& try_converter)
{
std::array<change, 3> input = {{ change::no, change::up, change::dn }};
std::array<string, 3> results = {{ "no", "up", "dn" }};
local::timer timer;
for (int k = 0; k < local::num_cycles; ++k)
{
string res = boost::convert<string>(input[k % 3], try_converter).value();
BOOST_TEST(res == results[k % 3]);
local::sum += res[0]; // Make sure res is not optimized out
}
return timer.value();
}
template<typename Raw, typename Cnv>
void
performance_comparative(Raw const& raw, Cnv const& cnv, char const* txt)
{
int const num_tries = 5;
double cnv_time = 0;
double raw_time = 0;
for (int k = 0; k < num_tries; ++k) cnv_time += local::str_to<int>(cnv);
for (int k = 0; k < num_tries; ++k) raw_time += raw_str_to<int>(raw);
cnv_time /= num_tries;
raw_time /= num_tries;
double change = 100 * (1 - cnv_time / raw_time);
printf("str-to-int: %s raw/cnv=%.2f/%.2f seconds (%.2f%%).\n", txt, raw_time, cnv_time, change);
}
int
main(int, char const* [])
{
printf("Started performance tests...\n");
printf("str-to-int: spirit/strtol/lcast/scanf/stream/charconv=%7.2f/%7.2f/%7.2f/%7.2f/%7.2f/%7.2f seconds.\n",
local::str_to<int>(boost::cnv::spirit()),
local::str_to<int>(boost::cnv::strtol()),
local::str_to<int>(boost::cnv::lexical_cast()),
local::str_to<int>(boost::cnv::printf()),
local::str_to<int>(boost::cnv::cstream()),
local::str_to<int>(boost::cnv::charconv()));
printf("str-to-lng: spirit/strtol/lcast/scanf/stream/charconv=%7.2f/%7.2f/%7.2f/%7.2f/%7.2f/%7.2f seconds.\n",
local::str_to<long int>(boost::cnv::spirit()),
local::str_to<long int>(boost::cnv::strtol()),
local::str_to<long int>(boost::cnv::lexical_cast()),
local::str_to<long int>(boost::cnv::printf()),
local::str_to<long int>(boost::cnv::cstream()),
local::str_to<long int>(boost::cnv::charconv()));
printf("str-to-dbl: spirit/strtol/lcast/scanf/stream/charconv=%7.2f/%7.2f/%7.2f/%7.2f/%7.2f/%7.2f seconds.\n",
local::str_to<double>(boost::cnv::spirit()),
local::str_to<double>(boost::cnv::strtol()),
local::str_to<double>(boost::cnv::lexical_cast()),
local::str_to<double>(boost::cnv::printf()),
local::str_to<double>(boost::cnv::cstream()),
local::str_to<double>(boost::cnv::charconv()));
printf("int-to-str: spirit/strtol/lcast/prntf/stream/charconv=%7.2f/%7.2f/%7.2f/%7.2f/%7.2f/%7.2f seconds.\n",
local::to_str<std::string, int>(boost::cnv::spirit()),
local::to_str<std::string, int>(boost::cnv::strtol()),
local::to_str<std::string, int>(boost::cnv::lexical_cast()),
local::to_str<std::string, int>(boost::cnv::printf()),
local::to_str<std::string, int>(boost::cnv::cstream()),
local::to_str<std::string, int>(boost::cnv::charconv()));
printf("lng-to-str: spirit/strtol/lcast/prntf/stream/charconv=%7.2f/%7.2f/%7.2f/%7.2f/%7.2f/%7.2f seconds.\n",
local::to_str<std::string, long int>(boost::cnv::spirit()),
local::to_str<std::string, long int>(boost::cnv::strtol()),
local::to_str<std::string, long int>(boost::cnv::lexical_cast()),
local::to_str<std::string, long int>(boost::cnv::printf()),
local::to_str<std::string, long int>(boost::cnv::cstream()),
local::to_str<std::string, long int>(boost::cnv::charconv()));
printf("dbl-to-str: spirit/strtol/lcast/prntf/stream/charconv=%7.2f/%7.2f/%7.2f/%7.2f/%7.2f/%7.2f seconds.\n",
local::to_str<std::string, double>(boost::cnv::spirit()),
local::to_str<std::string, double>(boost::cnv::strtol()(arg::precision = 6)),
local::to_str<std::string, double>(boost::cnv::lexical_cast()),
local::to_str<std::string, double>(boost::cnv::printf()(arg::precision = 6)),
local::to_str<std::string, double>(boost::cnv::cstream()(arg::precision = 6)),
local::to_str<std::string, double>(boost::cnv::charconv()(arg::precision = 6)));
printf("str-to-user-type: lcast/stream/strtol/charconv=%.2f/%.2f/%.2f/%.2f seconds.\n",
performance_str_to_type(boost::cnv::lexical_cast()),
performance_str_to_type(boost::cnv::cstream()),
performance_str_to_type(boost::cnv::strtol()),
performance_str_to_type(boost::cnv::charconv()));
printf("user-type-to-str: lcast/stream/strtol/charconv=%.2f/%.2f/%.2f/%.2f seconds.\n",
performance_type_to_str(boost::cnv::lexical_cast()),
performance_type_to_str(boost::cnv::cstream()),
performance_type_to_str(boost::cnv::strtol()),
performance_type_to_str(boost::cnv::charconv()));
//[small_string_results
printf("strtol int-to std::string/small-string: %.2f/%.2f seconds.\n",
local::to_str<std::string, int>(boost::cnv::strtol()),
local::to_str< my_string, int>(boost::cnv::strtol()));
printf("spirit int-to std::string/small-string: %.2f/%.2f seconds.\n",
local::to_str<std::string, int>(boost::cnv::spirit()),
local::to_str< my_string, int>(boost::cnv::spirit()));
printf("stream int-to std::string/small-string: %.2f/%.2f seconds.\n",
local::to_str<std::string, int>(boost::cnv::cstream()),
local::to_str< my_string, int>(boost::cnv::cstream()));
printf("charconv int-to std::string/small-string: %.2f/%.2f seconds.\n",
local::to_str<std::string, int>(boost::cnv::charconv()),
local::to_str< my_string, int>(boost::cnv::charconv()));
//]
performance_comparative(raw_str_to_int_spirit(), boost::cnv::spirit(), "spirit");
performance_comparative(raw_str_to_int_lxcast(), boost::cnv::lexical_cast(), "lxcast");
performance_comparative(raw_str_to_int_charconv(), boost::cnv::charconv(), "charconv");
return boost::report_errors();
}
#endif
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