73ef4ff3
 Hu Chunming
提交三方库
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// Boost.Units - A C++ library for zero-overhead dimensional analysis and
// unit/quantity manipulation and conversion
//
// Copyright (C) 2003-2008 Matthias Christian Schabel
// Copyright (C) 2008 Steven Watanabe
//
// 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)
/**
\file
\brief unit.cpp
\details
Test unit algebra.
Output:
@verbatim
//[unit_output
L = m
L+L = m
L-L = m
L/L = dimensionless
meter*meter = m^2
M*(L/T)*(L/T) = m^2 kg s^-2
M*(L/T)^2 = m^2 kg s^-2
L^3 = m^3
L^(3/2) = m^(3/2)
2vM = kg^(1/2)
(3/2)vM = kg^(2/3)
//]
@endverbatim
**/
#include <iostream>
#include "test_system.hpp"
#include <boost/units/pow.hpp>
int main()
{
using namespace boost::units;
using namespace boost::units::test;
//[unit_snippet_1
const length L;
const mass M;
// needs to be namespace-qualified because of global time definition
const boost::units::test::time T;
const energy E;
//]
std::cout << "L = " << L << std::endl
<< "L+L = " << L+L << std::endl
<< "L-L = " << L-L << std::endl
<< "L/L = " << L/L << std::endl
<< "meter*meter = " << meter*meter << std::endl
<< "M*(L/T)*(L/T) = " << M*(L/T)*(L/T) << std::endl
<< "M*(L/T)^2 = " << M*pow<2>(L/T) << std::endl
<< "L^3 = " << pow<3>(L) << std::endl
<< "L^(3/2) = " << pow<static_rational<3,2> >(L)
<< std::endl
<< "2vM = " << root<2>(M) << std::endl
<< "(3/2)vM = " << root<static_rational<3,2> >(M)
<< std::endl;
return 0;
}
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