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feat: ppm parts per million

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Co-authored-by: Mateusz Pusz <mateusz.pusz@gmail.com>
This commit is contained in:
Nebojša Cvetković
2024-01-20 00:05:54 +00:00
committed by Nebojsa Cvetkovic
parent 1df2cc7b58
commit a62f061028
3 changed files with 5 additions and 0 deletions
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2
docs/users_guide/framework_basics/dimensionless_quantities.md
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@ -160,6 +160,8 @@ with dimensionless quantities:
```cpp
inline constexpr struct percent : named_unit<"%", mag<ratio{1, 100}> * one> {} percent;
inline constexpr struct per_mille : named_unit<basic_symbol_text{"‰", "%o"}, mag<ratio(1, 1000)> * one> {} per_mille;
inline constexpr struct parts_per_million : named_unit<"ppm", mag<ratio(1, 1'000'000)> * one> {} parts_per_million;
inline constexpr auto ppm = parts_per_million;
```

2
src/core/include/mp-units/unit.h
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@ -605,6 +605,8 @@ template<std::intmax_t Num, std::intmax_t Den = 1, Unit U>
// clang-format off
inline constexpr struct percent : named_unit<"%", mag<ratio{1, 100}> * one> {} percent;
inline constexpr struct per_mille : named_unit<basic_symbol_text{"‰", "%o"}, mag<ratio(1, 1000)> * one> {} per_mille;
inline constexpr struct parts_per_million : named_unit<"ppm", mag<ratio(1, 1'000'000)> * one> {} parts_per_million;
inline constexpr auto ppm = parts_per_million;
// clang-format on

1
test/static/unit_symbol_test.cpp
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@ -120,6 +120,7 @@ static_assert(unit_symbol(one) == "");
static_assert(unit_symbol(percent) == "%");
static_assert(unit_symbol(per_mille) == "‰");
static_assert(unit_symbol<unit_symbol_formatting{.encoding = ascii}>(per_mille) == "%o");
static_assert(unit_symbol(parts_per_million) == "ppm");
static_assert(unit_symbol(square(metre)) == "m²");
static_assert(unit_symbol<unit_symbol_formatting{.encoding = ascii}>(square(metre)) == "m^2");
static_assert(unit_symbol(cubic(metre)) == "m³");