106 lines
3.3 KiB
C++
106 lines
3.3 KiB
C++
// Copyright (c) 2001-2010 Hartmut Kaiser
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//
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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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// The main purpose of this example is to show how a single fusion sequence
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// can be used to generate output of the elements in different sequences
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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 <boost/fusion/include/struct.hpp>
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#include <boost/fusion/include/nview.hpp>
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#include <boost/assign/std/vector.hpp>
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namespace fusion = boost::fusion;
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namespace karma = boost::spirit::karma;
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///////////////////////////////////////////////////////////////////////////////
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namespace client
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{
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// Our employee struct
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struct employee
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{
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std::string surname;
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std::string forename;
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int age;
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double salary;
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std::string department;
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};
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// define iterator type
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typedef std::back_insert_iterator<std::string> iterator_type;
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// This is the output routine taking a format description and the data to
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// print
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template <typename Generator, typename Sequence>
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void generate(Generator const& g, Sequence const& s)
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{
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std::string generated;
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iterator_type sink(generated);
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karma::generate(sink, g, s);
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std::cout << generated << std::endl;
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}
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}
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// We need to tell fusion about our employee struct to make it a first-class
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// fusion citizen. This has to be in global scope. Note that we don't need to
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// list the members of our struct in the same sequence a they are defined
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BOOST_FUSION_ADAPT_STRUCT(
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client::employee,
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(int, age)
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(std::string, surname)
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(std::string, forename)
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(std::string, department)
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(double, salary)
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)
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///////////////////////////////////////////////////////////////////////////////
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int main()
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{
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std::string str;
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// some employees
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client::employee john = { "John", "Smith", 25, 2000.50, "Sales" };
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client::employee mary = { "Mary", "Higgins", 23, 2200.36, "Marketing" };
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client::employee tom = { "Tom", "Taylor", 48, 3200.00, "Boss" };
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// print data about employees in different formats
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{
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// print forename and age
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client::generate(
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karma::string << ", " << karma::int_,
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fusion::as_nview<2, 0>(john));
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// print surname, forename, and salary
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client::generate(
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karma::string << ' ' << karma::string << ": " << karma::double_,
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fusion::as_nview<1, 2, 4>(mary));
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// print forename, age, and department
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client::generate(
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karma::string << ": " << karma::int_ << " (" << karma::string << ')',
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fusion::as_nview<2, 0, 3>(tom));
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}
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// now make a list of all employees and print them all
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std::vector<client::employee> employees;
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{
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using namespace boost::assign;
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employees += john, mary, tom;
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}
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// print surname, forename, and salary for all employees
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{
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typedef
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fusion::result_of::as_nview<client::employee const, 1, 2, 4>::type
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names_and_salary;
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karma::rule<client::iterator_type, names_and_salary()> r =
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karma::string << ' ' << karma::string << ": " << karma::double_;
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client::generate(r % karma::eol, employees);
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}
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return 0;
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}
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