115 lines
3.7 KiB
C++
115 lines
3.7 KiB
C++
/*=============================================================================
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Copyright (c) 2002-2010 Hartmut Kaiser
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Copyright (c) 2002-2010 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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///////////////////////////////////////////////////////////////////////////////
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//
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// This sample demonstrates a generator formatting and printing a matrix
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// of integers taken from a simple vector of vectors. The size and the
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// contents of the printed matrix is generated randomly.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <boost/config/warning_disable.hpp>
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#include <boost/spirit/include/karma.hpp>
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#include <iostream>
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#include <string>
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#include <vector>
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#include <cstdlib>
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#include <ctime>
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namespace karma = boost::spirit::karma;
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namespace client
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{
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///////////////////////////////////////////////////////////////////////////
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// Our matrix generator
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///////////////////////////////////////////////////////////////////////////
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//[tutorial_karma_nummatrix_grammar
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template <typename OutputIterator>
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struct matrix_grammar
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: karma::grammar<OutputIterator, std::vector<std::vector<int> >()>
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{
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matrix_grammar()
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: matrix_grammar::base_type(matrix)
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{
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using karma::int_;
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using karma::right_align;
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using karma::eol;
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element = right_align(10)[int_];
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row = '|' << *element << '|';
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matrix = row % eol;
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}
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karma::rule<OutputIterator, std::vector<std::vector<int> >()> matrix;
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karma::rule<OutputIterator, std::vector<int>()> row;
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karma::rule<OutputIterator, int()> element;
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};
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//]
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//[tutorial_karma_nummatrix
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template <typename OutputIterator>
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bool generate_matrix(OutputIterator& sink
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, std::vector<std::vector<int> > const& v)
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{
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matrix_grammar<OutputIterator> matrix;
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return karma::generate(
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sink, // destination: output iterator
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matrix, // the generator
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v // the data to output
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);
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}
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//]
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}
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////////////////////////////////////////////////////////////////////////////
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// Main program
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////////////////////////////////////////////////////////////////////////////
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int
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main()
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{
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std::cout << "/////////////////////////////////////////////////////////\n\n";
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std::cout << "\tPrinting integers in a matrix using Spirit...\n\n";
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std::cout << "/////////////////////////////////////////////////////////\n\n";
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// here we put the data to generate
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std::vector<std::vector<int> > v;
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// now, generate the size and the contents for the matrix
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std::srand((unsigned int)std::time(NULL));
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std::size_t rows = std::rand() / (RAND_MAX / 10);
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std::size_t columns = std::rand() / (RAND_MAX / 10);
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v.resize(rows);
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for (std::size_t row = 0; row < rows; ++row)
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{
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v[row].resize(columns);
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std::generate(v[row].begin(), v[row].end(), std::rand);
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}
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// ok, we got the matrix, now print it out
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std::string generated;
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std::back_insert_iterator<std::string> sink(generated);
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if (!client::generate_matrix(sink, v))
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{
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std::cout << "-------------------------\n";
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std::cout << "Generating failed\n";
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std::cout << "-------------------------\n";
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}
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else
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{
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std::cout << "-------------------------\n";
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std::cout << "Generated:\n" << generated << "\n";
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std::cout << "-------------------------\n";
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}
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return 0;
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}
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