feedc0de/mp-units
1
0
Fork 0
forked from mpusz/mp-units
Code Pull Requests Activity

Examples with an alternate way to create quantities refactored

Browse Source 
- examples modified to provide a unified library look-and-feel
- originals moved to a dedicated subdirectory for further reference and comparison
This commit is contained in:
Mateusz Pusz
2020-03-01 14:44:45 +01:00
parent 0c5864cc87
commit 4b33c0f7c5
10 changed files with 644 additions and 259 deletions
Download Patch File Download Diff File Expand all files Collapse all files
example/conversion_factor.cpp
+11 -31
View File
@@ -16,6 +16,7 @@
*/
#include <units/physical/si/length.h>
#include <units/format.h>
#include <iostream>
/*
@@ -36,44 +37,23 @@ inline constexpr std::common_type_t<typename Target::rep, typename Source::rep>
return target{source{1}}.count();
}
// get at the units text of the quantity, without its numeric value
inline auto constexpr units_str(const units::Quantity AUTO& q)
{
typedef std::remove_cvref_t<decltype(q)> qtype;
return units::detail::unit_text<typename qtype::dimension, typename qtype::unit>();
}
} // namespace
namespace {
namespace length {
template<typename Rep = double>
using m = units::si::length<units::si::metre, Rep>;
template<typename Rep = double>
using mm = units::si::length<units::si::millimetre, Rep>;
} // namespace length
} // namespace
using namespace units::si::literals;
int main()
{
std::cout << "conversion factor in mpusz/units...\n\n";
using namespace units::si;
constexpr length::m<> lengthA = 2.0q_m;
constexpr length::mm<> lengthB = lengthA;
std::cout << "conversion factor in mp-units...\n\n";
std::cout << "lengthA( " << lengthA << " ) and lengthB( " << lengthB << " )\n"
constexpr length<metre> lengthA = 2.0q_m;
constexpr length<millimetre> lengthB = lengthA;
std::cout << fmt::format("lengthA( {} ) and lengthB( {} )\n", lengthA, lengthB)
<< "represent the same length in different units.\n\n";
std::cout << "therefore ratio lengthA / lengthB == " << lengthA / lengthB << "\n\n";
std::cout << fmt::format("therefore ratio lengthA / lengthB == {}\n\n", lengthA / lengthB);
std::cout << "conversion factor from lengthA::unit of "
<< units_str(lengthA) << " to lengthB::unit of " << units_str(lengthB) << " :\n\n"
<< "lengthB.count( " << lengthB.count() << " ) == lengthA.count( " << lengthA.count()
<< " ) * conversion_factor( " << conversion_factor(lengthB, lengthA) << " )\n";
std::cout << fmt::format("conversion factor from lengthA::unit of {:%q} to lengthB::unit of {:%q}:\n\n", lengthA, lengthB)
<< fmt::format("lengthB.count( {} ) == lengthA.count( {} ) * conversion_factor( {} )\n",
lengthB.count(), lengthA.count(), conversion_factor(lengthB, lengthA));
}