mpusz/mp-units
1
0
Fork 1
mirror of https://github.com/mpusz/mp-units.git synced 2025-07-29 18:07:16 +02:00
Code Issues Packages Projects Releases Wiki Activity

refactor: References are now guarded UNITS_REFERENCES with (ON by default) + examples duplicated to subdirectories

Browse Source 
Now References can be disabled to meassure a compile time impact. Also the same examples are now provided in two subdirectories to be able to easily compare the pros and cons of every quantity construction technique.
This commit is contained in:
Mateusz Pusz
2021-04-06 15:57:28 +02:00
parent b842c3f94a
commit b982921d27
118 changed files with 2841 additions and 71 deletions
Download Patch File Download Diff File Expand all files Collapse all files

150
example/clcpp_response.cpp
View File

@ -1,150 +0,0 @@
/*
Copyright (c) 2003-2019 Andy Little.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses./
*/
#include <units/format.h>
#include <units/isq/si/area.h>
#include <units/isq/si/iau/length.h>
#include <units/isq/si/imperial/length.h>
#include <units/isq/si/international/length.h>
#include <units/isq/si/length.h>
#include <units/isq/si/time.h>
#include <units/isq/si/typographic/length.h>
#include <units/isq/si/us/length.h>
#include <units/quantity_io.h>
#include <iostream>
namespace {
void simple_quantities()
{
using namespace units::isq;
using namespace units::isq::si::references;
using namespace units::isq::si::international::references;
using distance = si::length<si::metre>;
using duration = si::time<si::second>;
constexpr distance kilometers = 1.0 * km;
constexpr distance miles = 1.0 * mi;
constexpr duration seconds = 1 * s;
constexpr duration minutes = 1 * min;
constexpr duration hours = 1 * h;
std::cout << "A physical quantities library can choose the simple\n";
std::cout << "option to provide output using a single type for each base unit:\n\n";
std::cout << kilometers << '\n';
std::cout << miles << '\n';
std::cout << seconds << '\n';
std::cout << minutes << '\n';
std::cout << hours << "\n\n";
}
void quantities_with_typed_units()
{
using namespace units::isq;
using namespace units::isq::si::references;
using namespace units::isq::si::international::references;
constexpr si::length<si::kilometre> kilometers = 1.0 * km;
constexpr si::length<si::international::mile> miles = 1.0 * mi;
std::cout.precision(6);
constexpr si::time<si::second> seconds = 1 * s;
constexpr si::time<si::minute> minutes = 1 * min;
constexpr si::time<si::hour> hours = 1 * h;
std::cout << "A more flexible option is to provide separate types for each unit,\n\n";
std::cout << kilometers << '\n';
std::cout << miles << '\n';
std::cout << seconds << '\n';
std::cout << minutes << '\n';
std::cout << hours << "\n\n";
constexpr si::length<si::metre> meter = 1 * m;
std::cout << "then a wide range of pre-defined units can be defined and converted,\n"
" for consistency and repeatability across applications:\n\n";
std::cout << meter << '\n';
std::cout << " = " << quantity_cast<si::astronomical_unit>(meter) << '\n';
std::cout << " = " << quantity_cast<si::iau::angstrom>(meter) << '\n';
std::cout << " = " << quantity_cast<si::imperial::chain>(meter) << '\n';
std::cout << " = " << quantity_cast<si::international::fathom>(meter) << '\n';
std::cout << " = " << quantity_cast<si::us::fathom>(meter) << '\n';
std::cout << " = " << quantity_cast<si::international::foot>(meter) << '\n';
std::cout << " = " << quantity_cast<si::us::foot>(meter) << '\n';
std::cout << " = " << quantity_cast<si::international::inch>(meter) << '\n';
std::cout << " = " << quantity_cast<si::iau::light_year>(meter) << '\n';
std::cout << " = " << quantity_cast<si::international::mile>(meter) << '\n';
std::cout << " = " << quantity_cast<si::international::nautical_mile>(meter) << '\n';
std::cout << " = " << quantity_cast<si::iau::parsec>(meter) << '\n';
std::cout << " = " << quantity_cast<si::typographic::pica_comp>(meter) << '\n';
std::cout << " = " << quantity_cast<si::typographic::pica_prn>(meter) << '\n';
std::cout << " = " << quantity_cast<si::typographic::point_comp>(meter) << '\n';
std::cout << " = " << quantity_cast<si::typographic::point_prn>(meter) << '\n';
std::cout << " = " << quantity_cast<si::imperial::rod>(meter) << '\n';
std::cout << " = " << quantity_cast<si::international::yard>(meter) << '\n';
}
void calcs_comparison()
{
using namespace units::isq;
using namespace units::isq::si::references;
std::cout << "\nA distinct unit for each type is efficient and accurate\n"
"when adding two values of the same very big\n"
"or very small type:\n\n";
si::length<si::femtometre, float> L1A = 2. * fm;
si::length<si::femtometre, float> L2A = 3. * fm;
si::length<si::femtometre, float> LrA = L1A + L2A;
fmt::print("{:%.30Q %q}\n + {:%.30Q %q}\n = {:%.30Q %q}\n\n", L1A, L2A, LrA);
std::cout << "The single unit method must convert large\n"
"or small values in other units to the base unit.\n"
"This is both inefficient and inaccurate\n\n";
si::length<si::metre, float> L1B = L1A;
si::length<si::metre, float> L2B = L2A;
si::length<si::metre, float> LrB = L1B + L2B;
fmt::print("{:%.30Q %q}\n + {:%.30Q %q}\n = {:%.30Q %q}\n\n", L1B, L2B, LrB);
std::cout << "In multiplication and division:\n\n";
si::area<si::square_femtometre, float> ArA = L1A * L2A;
fmt::print("{:%.30Q %q}\n * {:%.30Q %q}\n = {:%.30Q %q}\n\n", L1A, L2A, ArA);
std::cout << "similar problems arise\n\n";
si::area<si::square_metre, float> ArB = L1B * L2B;
fmt::print("{:%.30Q %q}\n * {:%.30Q %q}\n = {:%.30Q %q}\n\n", L1B, L2B, ArB);
}
} // namespace
int main()
{
std::cout << "This demo was originally posted on com.lang.c++.moderated in 2006\n";
std::cout << "http://compgroups.net/comp.lang.c++.moderated/dimensional-analysis-units/51712\n";
std::cout << "Here converted to use mp-units library.\n\n";
simple_quantities();
quantities_with_typed_units();
calcs_comparison();
}