boost_1_45_0/libs/spirit/optimization/karma/sequence_performance.cpp

//  Copyright (c) 2005-2010 Hartmut Kaiser
// 
//  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)

#define FUSION_MAX_TUPLE_SIZE         10
#define USE_FUSION_VECTOR

#include <climits>

#include <iostream> 
#include <boost/preprocessor/repeat.hpp>
#include <boost/preprocessor/inc.hpp>

#include <boost/spirit/include/karma.hpp>

#include "../high_resolution_timer.hpp"

///////////////////////////////////////////////////////////////////////////////
static char const* const literal_sequences[] = {
    "", "a", "ab", "abc", "abcd", "abcde", 
    "abcdef", "abcdefg", "abcdefgh", "abcdefghi", "abcdefgij"
};

///////////////////////////////////////////////////////////////////////////////
#define MAX_ITERATION         10000000
#define MAX_SEQUENCE_LENGTH   9
#define RCHAR(z, n, _)        char_((char)('a' + n)) <<

#define SEQUENCE_TEST(z, N, _)                                                \
    {                                                                         \
        util::high_resolution_timer t;                                        \
                                                                              \
        for (int i = 0; i < MAX_ITERATION; ++i)                               \
        {                                                                     \
            char *ptr = buffer;                                               \
            generate(ptr, BOOST_PP_REPEAT(N, RCHAR, _) char_('\0'));          \
        }                                                                     \
                                                                              \
        std::cout << "karma::sequence(" << BOOST_PP_INC(N) << "):\t"          \
            << std::setw(9) << t.elapsed() << "\t"                            \
            << std::flush << std::endl;                                       \
                                                                              \
        BOOST_ASSERT(std::string(buffer) == literal_sequences[N]);            \
    }                                                                         \
    /**/

//         double elapsed = t.elapsed();                                         \
//         for (int i = 0; i < MAX_ITERATION; ++i)                               \
//         {                                                                     \
//             char *ptr = buffer;                                               \
//             generate(ptr, lit(literal_sequences[N]) << char_('\0'));          \
//         }                                                                     \
//                                                                               \
//         t.restart();                                                          \
//                                                                               \
//             << std::setw(9) << elapsed << " [s]"                              \

///////////////////////////////////////////////////////////////////////////////
int main()
{
    using namespace boost::spirit::karma;
    using namespace boost::spirit::ascii;
    char buffer[512]; // we don't expect more than 512 bytes to be generated here

    std::cout << "Benchmarking sequence of different length: " << std::endl;
    BOOST_PP_REPEAT_FROM_TO(1, MAX_SEQUENCE_LENGTH, SEQUENCE_TEST, _);

    return 0;
}