117 lines
3.2 KiB
C++
117 lines
3.2 KiB
C++
// Boost.Units - A C++ library for zero-overhead dimensional analysis and
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// unit/quantity manipulation and conversion
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//
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// Copyright (C) 2003-2008 Matthias Christian Schabel
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// Copyright (C) 2008 Steven Watanabe
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <map>
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#include <iostream>
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#include <boost/lexical_cast.hpp>
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#include <boost/units/quantity.hpp>
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#include <boost/units/cmath.hpp>
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#include <boost/units/systems/si/length.hpp>
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#include <boost/units/base_units/imperial/foot.hpp>
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//[runtime_unit_snippet_1
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namespace {
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using namespace boost::units;
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using imperial::foot_base_unit;
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std::map<std::string, quantity<si::length> > known_units;
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}
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quantity<si::length> calculate(const quantity<si::length>& t)
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{
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return(boost::units::hypot(t, 2.0 * si::meters));
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}
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int main()
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{
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known_units["meter"] = 1.0 * si::meters;
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known_units["centimeter"] = .01 * si::meters;
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known_units["foot"] =
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conversion_factor(foot_base_unit::unit_type(), si::meter) * si::meter;
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std::string output_type("meter");
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std::string input;
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while((std::cout << "> ") && (std::cin >> input))
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{
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if(!input.empty() && input[0] == '#')
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{
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std::getline(std::cin, input);
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}
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else if(input == "exit")
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{
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break;
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}
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else if(input == "help")
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{
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std::cout << "type \"exit\" to exit\n"
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"type \"return 'unit'\" to set the return units\n"
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"type \"'number' 'unit'\" to do a simple calculation"
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<< std::endl;
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}
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else if(input == "return")
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{
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if(std::cin >> input)
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{
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if(known_units.find(input) != known_units.end())
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{
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output_type = input;
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std::cout << "Done." << std::endl;
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}
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else
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{
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std::cout << "Unknown unit \"" << input << "\""
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<< std::endl;
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}
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}
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else
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{
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break;
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}
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}
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else
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{
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try
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{
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double value = boost::lexical_cast<double>(input);
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if(std::cin >> input)
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{
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if(known_units.find(input) != known_units.end())
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{
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std::cout << static_cast<double>(
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calculate(value * known_units[input]) /
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known_units[output_type])
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<< ' ' << output_type << std::endl;
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}
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else
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{
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std::cout << "Unknown unit \"" << input << "\""
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<< std::endl;
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}
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}
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else
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{
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break;
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}
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}
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catch(...)
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{
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std::cout << "Input error" << std::endl;
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}
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}
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}
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}
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//]
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