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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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