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- // Copyright (c) 2002-2010 Hartmut Kaiser
- // Copyright (c) 2002-2010 Joel de Guzman
- //
- // Distributed under 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)
- #include <boost/config/warning_disable.hpp>
- #include <boost/spirit/include/karma.hpp>
- #include <boost/format.hpp>
- #include <iostream>
- #include "../high_resolution_timer.hpp"
- #define NUMITERATIONS 1000000
- ///////////////////////////////////////////////////////////////////////////////
- // policy for real_generator, which forces to output trailing zeros in the
- // fractional part
- //[karma_format_performance_definitions
- template <typename T>
- struct double3_policy : boost::spirit::karma::real_policies<T>
- {
- // we want to generate up to 3 fractional digits
- static unsigned int precision(T) { return 3; }
- };
- typedef boost::spirit::karma::real_generator<double, double3_policy<double> >
- double3_type;
- double3_type const double3 = double3_type();
- //]
- void format_performance_karma()
- {
- using boost::spirit::karma::left_align;
- using boost::spirit::karma::generate;
- //[karma_format_performance_plain
- char buffer[256];
- //<-
- util::high_resolution_timer t;
- //->
- for (int i = 0; i < NUMITERATIONS; ++i) {
- char *p = buffer;
- generate(p
- , '[' << left_align(14)[double3] << left_align(14)[double3] << ']'
- , 12345.12345, 12345.12345);
- *p = '\0';
- }
- //]
- std::cout << "karma:\t\t" << t.elapsed() << std::endl;
- // std::cout << buffer << std::endl;
- }
- void format_performance_rule()
- {
- using boost::spirit::karma::left_align;
- using boost::spirit::karma::generate;
- typedef boost::fusion::vector<double, double> rtype;
- boost::spirit::karma::rule<char*, rtype()> r;
- //[karma_format_performance_rule
- char buffer[256];
- r %= '[' << left_align(14)[double3] << left_align(14)[double3] << ']';
- //<-
- util::high_resolution_timer t;
- //->
- for (int i = 0; i < NUMITERATIONS; ++i) {
- char *p = buffer;
- generate(p, r, 12345.12345, 12345.12345);
- *p = '\0';
- }
- //]
- std::cout << "karma (rule):\t" << t.elapsed() << std::endl;
- // std::cout << buffer << std::endl;
- }
- void format_performance_string()
- {
- using boost::spirit::karma::left_align;
- using boost::spirit::karma::generate;
- //[karma_format_performance_string
- std::string generated;
- std::back_insert_iterator<std::string> sink(generated);
- //<-
- util::high_resolution_timer t;
- //->
- for (int i = 0; i < NUMITERATIONS; ++i) {
- generated.clear();
- generate(sink
- , '[' << left_align(14)[double3] << left_align(14)[double3] << ']'
- , 12345.12345, 12345.12345);
- }
- //]
- std::cout << "karma (string):\t" << t.elapsed() << std::endl;
- // std::cout << generated << std::endl;
- }
- // Boost.Format
- void format_performance_boost_format()
- {
- //[karma_format_performance_format
- std::string generated;
- boost::format outformat("[%-14.3f%-14.3f]");
- //<-
- util::high_resolution_timer t;
- //->
- for (int i = 0; i < NUMITERATIONS; ++i)
- generated = boost::str(outformat % 12345.12345 % 12345.12345);
- //]
- std::cout << "format:\t\t" << t.elapsed() << std::endl;
- // std::cout << strm.str() << std::endl;
- }
- void format_performance_sprintf()
- {
- util::high_resolution_timer t;
- //[karma_format_performance_printf
- char buffer[256];
- for (int i = 0; i < NUMITERATIONS; ++i) {
- sprintf(buffer, "[%-14.3f%-14.3f]", 12345.12345, 12345.12345);
- }
- //]
- std::cout << "sprintf:\t" << t.elapsed() << std::endl;
- // std::cout << buffer << std::endl;
- }
- void format_performance_iostreams()
- {
- //[karma_format_performance_iostreams
- std::stringstream strm;
- //<-
- util::high_resolution_timer t;
- //->
- for (int i = 0; i < NUMITERATIONS; ++i) {
- strm.str("");
- strm << '['
- << std::setiosflags(std::ios::fixed)
- << std::left
- << std::setprecision(3)
- << std::setw(14)
- << 12345.12345
- << std::setw(14)
- << 12345.12345
- << ']';
- }
- //]
- std::cout << "iostreams:\t" << t.elapsed() << std::endl;
- // std::cout << strm.str() << std::endl;
- }
- ///////////////////////////////////////////////////////////////////////////////
- int main()
- {
- format_performance_sprintf();
- format_performance_iostreams();
- format_performance_boost_format();
- format_performance_karma();
- format_performance_string();
- format_performance_rule();
- return 0;
- }
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