feat: alternative litre unit symbol L added to prevent ambiguities …

…with `1`
mpusz · Oct 6, 2024 · dd55a52 · dd55a52
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diff --git a/docs/users_guide/framework_basics/text_output.md b/docs/users_guide/framework_basics/text_output.md
@@ -275,15 +275,15 @@ In most cases [scaled units are hidden behind named units](systems_of_units.md#s
 However, there are a few real-life where a user directly faces a scaled unit. For example:
 
 ```cpp
-constexpr Unit auto l_per_100km = l / (mag<100> * km);
+constexpr Unit auto L_per_100km = L / (mag<100> * km);
 ```
 
 The above is a derived unit of litre divided by a scaled unit of 100 kilometers. As we can
 see a scaled unit has a magnitude and a reference unit. To denote the scope of such
 a unit, we enclose it in `[...]`. For example, the following:
 
 ```cpp
-std::cout << 6.7 * l_per_100km << "\n";
+std::cout << 6.7 * L_per_100km << "\n";
 ```
 
 prints:

diff --git a/src/systems/include/mp-units/systems/si/unit_symbols.h b/src/systems/include/mp-units/systems/si/unit_symbols.h
@@ -791,6 +791,7 @@ inline constexpr auto arcsec = arcsecond;
 inline constexpr auto a = are;
 inline constexpr auto ha = hectare;
 inline constexpr auto l = litre;
+inline constexpr auto L = litre;  // both versions of litre are allowed
 inline constexpr auto t = tonne;
 inline constexpr auto Da = dalton;
 inline constexpr auto eV = electronvolt;