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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)
- =============================================================================*/
- ///////////////////////////////////////////////////////////////////////////////
- //
- // This sample demonstrates a generator formatting and printing a matrix
- // of integers taken from a simple vector of vectors. The size and the
- // contents of the printed matrix is generated randomly.
- //
- ///////////////////////////////////////////////////////////////////////////////
- #include <boost/config/warning_disable.hpp>
- #include <boost/spirit/include/karma.hpp>
- #include <iostream>
- #include <string>
- #include <vector>
- #include <cstdlib>
- #include <ctime>
- namespace karma = boost::spirit::karma;
- namespace client
- {
- ///////////////////////////////////////////////////////////////////////////
- // Our matrix generator
- ///////////////////////////////////////////////////////////////////////////
- //[tutorial_karma_nummatrix_grammar
- template <typename OutputIterator>
- struct matrix_grammar
- : karma::grammar<OutputIterator, std::vector<std::vector<int> >()>
- {
- matrix_grammar()
- : matrix_grammar::base_type(matrix)
- {
- using karma::int_;
- using karma::right_align;
- using karma::eol;
- element = right_align(10)[int_];
- row = '|' << *element << '|';
- matrix = row % eol;
- }
- karma::rule<OutputIterator, std::vector<std::vector<int> >()> matrix;
- karma::rule<OutputIterator, std::vector<int>()> row;
- karma::rule<OutputIterator, int()> element;
- };
- //]
- //[tutorial_karma_nummatrix
- template <typename OutputIterator>
- bool generate_matrix(OutputIterator& sink
- , std::vector<std::vector<int> > const& v)
- {
- matrix_grammar<OutputIterator> matrix;
- return karma::generate(
- sink, // destination: output iterator
- matrix, // the generator
- v // the data to output
- );
- }
- //]
- }
- ////////////////////////////////////////////////////////////////////////////
- // Main program
- ////////////////////////////////////////////////////////////////////////////
- int
- main()
- {
- std::cout << "/////////////////////////////////////////////////////////\n\n";
- std::cout << "\tPrinting integers in a matrix using Spirit...\n\n";
- std::cout << "/////////////////////////////////////////////////////////\n\n";
- // here we put the data to generate
- std::vector<std::vector<int> > v;
- // now, generate the size and the contents for the matrix
- std::srand((unsigned int)std::time(NULL));
- std::size_t rows = std::rand() / (RAND_MAX / 10);
- std::size_t columns = std::rand() / (RAND_MAX / 10);
- v.resize(rows);
- for (std::size_t row = 0; row < rows; ++row)
- {
- v[row].resize(columns);
- std::generate(v[row].begin(), v[row].end(), std::rand);
- }
- // ok, we got the matrix, now print it out
- std::string generated;
- std::back_insert_iterator<std::string> sink(generated);
- if (!client::generate_matrix(sink, v))
- {
- std::cout << "-------------------------\n";
- std::cout << "Generating failed\n";
- std::cout << "-------------------------\n";
- }
- else
- {
- std::cout << "-------------------------\n";
- std::cout << "Generated:\n" << generated << "\n";
- std::cout << "-------------------------\n";
- }
- return 0;
- }
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