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extending the range of operator* for incoherent units with large num/den

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this improves the situation for #55 (doesn't solve it outright)
motivating examples which now work are:
1q_mi * 1q_mi * 1q_mi
1q_au * 1q_au
tests added and docs updated
This commit is contained in:
Oliver Schönrock
2020-02-20 22:15:05 +00:00
committed by Mateusz Pusz
parent 9fdb5822f9
commit 834d1fa09d
4 changed files with 13 additions and 7 deletions
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2
doc/DESIGN.md
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@@ -78,7 +78,7 @@ where:
```cpp
template<typename R>
concept UnitRatio = Ratio<R> && (R::num * R::den > 0);
concept UnitRatio = Ratio<R> && R::num > 0 && R::den > 0; // double negatives not allowed
```
and `Ratio` is satisfied by any instantiation of `units::ratio<Num, Den, Exp>`.

10
src/include/units/bits/external/text_tools.h vendored
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@@ -26,7 +26,7 @@
namespace units::detail {
template<int Value>
template<std::intmax_t Value>
requires (0 <= Value) && (Value < 10)
inline constexpr basic_fixed_string superscript_number = "";
@@ -43,7 +43,7 @@ template<> inline constexpr basic_fixed_string superscript_number<9> = "\u2079";
inline constexpr basic_fixed_string superscript_minus = "\u207b";
template<int Value>
template<std::intmax_t Value>
constexpr auto superscript()
{
if constexpr(Value < 0)
@@ -54,12 +54,12 @@ constexpr auto superscript()
return superscript<Value / 10>() + superscript<Value % 10>();
}
template<int Value>
template<std::intmax_t Value>
constexpr auto regular()
{
if constexpr(Value < 0)
if constexpr (Value < 0)
return basic_fixed_string("-") + superscript<-Value>();
else if constexpr(Value < 10)
else if constexpr (Value < 10)
return basic_fixed_string(static_cast<char>('0' + Value));
else
return regular<Value / 10>() + regular<Value % 10>();

2
src/include/units/concepts.h
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@@ -79,7 +79,7 @@ concept Ratio = detail::is_ratio<T>;
// UnitRatio
template<typename R>
concept UnitRatio = Ratio<R> && (R::num * R::den > 0);
concept UnitRatio = Ratio<R> && R::num > 0 && R::den > 0; // double negatives not allowed
// Unit
template<UnitRatio R, typename U>

6
test/unit_test/runtime/fmt_units_test.cpp
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@@ -175,4 +175,10 @@ TEST_CASE("fmt::format on synthesized unit symbols", "[text][fmt]")
{
CHECK(fmt::format("{}", 1q_in + 1q_yd) == "37 in");
}
SECTION("incoherent units with powers")
{
CHECK(fmt::format("{}", 1q_mi * 1q_mi * 1q_mi) == "1 [15900351812136/3814697265625 × 10⁹] m³");
CHECK(fmt::format("{}", 1q_au * 1q_au) == "1 [2237952291797391849 × 10⁴] m²");
}
}