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docs: project documentation updated with the latest unit-related changes

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Mateusz Pusz
2022-05-11 16:28:14 +02:00
parent 5300caf17b
commit 01271a90b6
6 changed files with 206 additions and 208 deletions
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@@ -1,122 +1,157 @@
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package Unit <<Frame>> [[../../framework/units.html]] { package Unit <<Frame>> [[../../framework/units.html]] {
abstract prefix_family [[../../framework/units.html#prefixed-unit]]
abstract no_prefix [[../../framework/units.html#named-scaled-units]]
abstract prefix<PrefixFamily, Symbol, Ratio> [[../../framework/units.html#prefixed-unit]]
prefix_family <|- - no_prefix
prefix_family <.. prefix
' prefix_family <.. named_unit
' prefix_family <.. named_scaled_unit
' prefix_family <.. named_derived_unit
' prefix_family <.. alias_unit
' prefix <.. prefixed_unit
' prefix <.. prefixed_alias_unit
abstract scaled_unit<UnitRatio, Unit> abstract scaled_unit<UnitRatio, Unit>
abstract prefixed_alias_unit<Unit, Prefix, AliasUnit> [[../../framework/units.html#aliased-units]] abstract prefixed_alias_unit<Unit, Prefix, AliasUnit> [[../../framework/units.html#aliased-units]]
abstract alias_unit<Unit, Symbol, PrefixFamily> [[../../framework/units.html#aliased-units]] abstract alias_unit<Unit, Symbol> [[../../framework/units.html#aliased-units]]
abstract named_derived_unit<Dimension, Symbol, PrefixFamily, Unit, Unit...> [[../../framework/units.html#derived-scaled-units]] abstract derived_scaled_unit<Dimension, Unit, Unit...> [[../../framework/units.html#derived-scaled-units]]
abstract derived_unit<Dimension, Unit, Unit...> [[../../framework/units.html#derived-scaled-units]] abstract derived_unit [[../../framework/units.html#derived-unnamed-units]]
abstract prefixed_unit<Prefix, Unit> [[../../framework/units.html#prefixed-unit]] abstract prefixed_unit<Prefix, Unit> [[../../framework/units.html#prefixed-unit]]
abstract named_scaled_unit<Symbol, PrefixFamily, Ratio, Unit> [[../../framework/units.html#named-scaled-units]] abstract named_scaled_unit<Symbol, Ratio, Unit> [[../../framework/units.html#named-scaled-units]]
abstract named_unit<Symbol, PrefixFamily> [[../../framework/units.html#base-units]] abstract named_unit<Symbol> [[../../framework/units.html#base-units]]
abstract unit [[../../framework/units.html#derived-unnamed-units]]
scaled_unit <|- - unit
scaled_unit <|- - named_unit scaled_unit <|- - named_unit
scaled_unit <|- - named_scaled_unit scaled_unit <|- - named_scaled_unit
scaled_unit <|- - prefixed_unit scaled_unit <|- - prefixed_unit
scaled_unit <|- - derived_unit scaled_unit <|- - derived_unit
scaled_unit <|- - named_derived_unit scaled_unit <|- - derived_scaled_unit
scaled_unit <|- - alias_unit scaled_unit <|- - alias_unit
scaled_unit <|- - prefixed_alias_unit scaled_unit <|- - prefixed_alias_unit
} }
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package Unit <<Frame>> [[../../framework/units.html]] {
abstract prefix_family [[../../framework/units.html#prefixed-unit]]
abstract no_prefix [[../../framework/units.html#named-scaled-units]]
abstract prefix<PrefixFamily, Symbol, Ratio> [[../../framework/units.html#prefixed-unit]]
prefix_family <|- - no_prefix
prefix_family <.. prefix
abstract scaled_unit<UnitRatio, Unit>
abstract prefixed_alias_unit<Unit, Prefix, AliasUnit> [[../../framework/units.html#aliased-units]]
abstract alias_unit<Unit, Symbol, PrefixFamily> [[../../framework/units.html#aliased-units]]
abstract named_derived_unit<Dimension, Symbol, PrefixFamily, Unit, Unit...> [[../../framework/units.html#derived-scaled-units]]
abstract derived_unit<Dimension, Unit, Unit...> [[../../framework/units.html#derived-scaled-units]]
abstract prefixed_unit<Prefix, Unit> [[../../framework/units.html#prefixed-unit]]
abstract named_scaled_unit<Symbol, PrefixFamily, Ratio, Unit> [[../../framework/units.html#named-scaled-units]]
abstract named_unit<Symbol, PrefixFamily> [[../../framework/units.html#base-units]]
abstract unit [[../../framework/units.html#derived-unnamed-units]]
scaled_unit <|- - unit
scaled_unit <|- - named_unit
scaled_unit <|- - named_scaled_unit
scaled_unit <|- - prefixed_unit
scaled_unit <|- - derived_unit
scaled_unit <|- - named_derived_unit
scaled_unit <|- - alias_unit
scaled_unit <|- - prefixed_alias_unit
}
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103
docs/framework/units.rst
View File

@@ -40,38 +40,22 @@ of a `scaled_unit` class template:
left to right direction left to right direction
package Unit <<Frame>> [[../../framework/units.html]] { package Unit <<Frame>> [[../../framework/units.html]] {
abstract prefix_family [[../../framework/units.html#prefixed-unit]]
abstract no_prefix [[../../framework/units.html#named-scaled-units]]
abstract prefix<PrefixFamily, Symbol, Ratio> [[../../framework/units.html#prefixed-unit]]
prefix_family <|-- no_prefix
prefix_family <.. prefix
' prefix_family <.. named_unit
' prefix_family <.. named_scaled_unit
' prefix_family <.. named_derived_unit
' prefix_family <.. alias_unit
' prefix <.. prefixed_unit
' prefix <.. prefixed_alias_unit
abstract scaled_unit<UnitRatio, Unit> abstract scaled_unit<UnitRatio, Unit>
abstract prefixed_alias_unit<Unit, Prefix, AliasUnit> [[../../framework/units.html#aliased-units]] abstract prefixed_alias_unit<Unit, Prefix, AliasUnit> [[../../framework/units.html#aliased-units]]
abstract alias_unit<Unit, Symbol, PrefixFamily> [[../../framework/units.html#aliased-units]] abstract alias_unit<Unit, Symbol> [[../../framework/units.html#aliased-units]]
abstract named_derived_unit<Dimension, Symbol, PrefixFamily, Unit, Unit...> [[../../framework/units.html#derived-scaled-units]] abstract derived_scaled_unit<Dimension, Unit, Unit...> [[../../framework/units.html#derived-scaled-units]]
abstract derived_unit<Dimension, Unit, Unit...> [[../../framework/units.html#derived-scaled-units]] abstract derived_unit [[../../framework/units.html#derived-unnamed-units]]
abstract prefixed_unit<Prefix, Unit> [[../../framework/units.html#prefixed-unit]] abstract prefixed_unit<Prefix, Unit> [[../../framework/units.html#prefixed-unit]]
abstract named_scaled_unit<Symbol, PrefixFamily, Ratio, Unit> [[../../framework/units.html#named-scaled-units]] abstract named_scaled_unit<Symbol, Ratio, Unit> [[../../framework/units.html#named-scaled-units]]
abstract named_unit<Symbol, PrefixFamily> [[../../framework/units.html#base-units]] abstract named_unit<Symbol> [[../../framework/units.html#base-units]]
abstract unit [[../../framework/units.html#derived-unnamed-units]]
scaled_unit <|-- unit
scaled_unit <|-- named_unit scaled_unit <|-- named_unit
scaled_unit <|-- named_scaled_unit scaled_unit <|-- named_scaled_unit
scaled_unit <|-- prefixed_unit scaled_unit <|-- prefixed_unit
scaled_unit <|-- derived_unit scaled_unit <|-- derived_unit
scaled_unit <|-- named_derived_unit scaled_unit <|-- derived_scaled_unit
scaled_unit <|-- alias_unit scaled_unit <|-- alias_unit
scaled_unit <|-- prefixed_alias_unit scaled_unit <|-- prefixed_alias_unit
} }
@@ -191,14 +175,11 @@ Those units are the scaled versions of a time dimension's base unit,
namely second. Those can be defined easily in the library using namely second. Those can be defined easily in the library using
`named_scaled_unit` class template:: `named_scaled_unit` class template::
struct minute : named_scaled_unit<minute, "min", no_prefix, ratio(60), second> {}; struct minute : named_scaled_unit<minute, "min", ratio(60), second> {};
struct hour : named_scaled_unit<hour, "h", no_prefix, ratio(60), minute> {}; struct hour : named_scaled_unit<hour, "h", ratio(60), minute> {};
struct day : named_scaled_unit<day, "d", no_prefix, ratio(24), hour> {}; struct day : named_scaled_unit<day, "d", ratio(24), hour> {};
where `no_prefix` is a special tag type describing that the library should The `ratio` type used in the definition is really similar to ``std::ratio`` but it takes
not allow to define a new prefixed unit that would use this unit as a
reference ("kilohours" does not have much sense, right?). The `ratio` type
used in the definition is really similar to ``std::ratio`` but it takes
an additional ``Exponent`` template parameter that defines the exponent of the ratio. an additional ``Exponent`` template parameter that defines the exponent of the ratio.
Another important difference is the fact that the objects of that class are used Another important difference is the fact that the objects of that class are used
as class NTTPs rather then a type template parameter kind. as class NTTPs rather then a type template parameter kind.
@@ -227,28 +208,26 @@ complete list of all the :term:`SI` prefixes supported by the library::
namespace si { namespace si {
struct prefix : prefix_family {}; struct yocto : units::prefix<yocto, "y", ratio(1, 1, -24)> {};
struct zepto : units::prefix<zepto, "z", ratio(1, 1, -21)> {};
struct yocto : units::prefix<yocto, prefix, "y", ratio(1, 1, -24)> {}; struct atto : units::prefix<atto, "a", ratio(1, 1, -18)> {};
struct zepto : units::prefix<zepto, prefix, "z", ratio(1, 1, -21)> {}; struct femto : units::prefix<femto, "f", ratio(1, 1, -15)> {};
struct atto : units::prefix<atto, prefix, "a", ratio(1, 1, -18)> {}; struct pico : units::prefix<pico, "p", ratio(1, 1, -12)> {};
struct femto : units::prefix<femto, prefix, "f", ratio(1, 1, -15)> {}; struct nano : units::prefix<nano, "n", ratio(1, 1, -9)> {};
struct pico : units::prefix<pico, prefix, "p", ratio(1, 1, -12)> {}; struct micro : units::prefix<micro, "µ", ratio(1, 1, -6)> {};
struct nano : units::prefix<nano, prefix, "n", ratio(1, 1, -9)> {}; struct milli : units::prefix<milli, "m", ratio(1, 1, -3)> {};
struct micro : units::prefix<micro, prefix, "µ", ratio(1, 1, -6)> {}; struct centi : units::prefix<centi, "c", ratio(1, 1, -2)> {};
struct milli : units::prefix<milli, prefix, "m", ratio(1, 1, -3)> {}; struct deci : units::prefix<deci, "d", ratio(1, 1, -1)> {};
struct centi : units::prefix<centi, prefix, "c", ratio(1, 1, -2)> {}; struct deca : units::prefix<deca, "da",ratio(1, 1, 1)> {};
struct deci : units::prefix<deci, prefix, "d", ratio(1, 1, -1)> {}; struct hecto : units::prefix<hecto, "h", ratio(1, 1, 2)> {};
struct deca : units::prefix<deca, prefix, "da", ratio(1, 1, 1)> {}; struct kilo : units::prefix<kilo, "k", ratio(1, 1, 3)> {};
struct hecto : units::prefix<hecto, prefix, "h", ratio(1, 1, 2)> {}; struct mega : units::prefix<mega, "M", ratio(1, 1, 6)> {};
struct kilo : units::prefix<kilo, prefix, "k", ratio(1, 1, 3)> {}; struct giga : units::prefix<giga, "G", ratio(1, 1, 9)> {};
struct mega : units::prefix<mega, prefix, "M", ratio(1, 1, 6)> {}; struct tera : units::prefix<tera, "T", ratio(1, 1, 12)> {};
struct giga : units::prefix<giga, prefix, "G", ratio(1, 1, 9)> {}; struct peta : units::prefix<peta, "P", ratio(1, 1, 15)> {};
struct tera : units::prefix<tera, prefix, "T", ratio(1, 1, 12)> {}; struct exa : units::prefix<exa, "E", ratio(1, 1, 18)> {};
struct peta : units::prefix<peta, prefix, "P", ratio(1, 1, 15)> {}; struct zetta : units::prefix<zetta, "Z", ratio(1, 1, 21)> {};
struct exa : units::prefix<exa, prefix, "E", ratio(1, 1, 18)> {}; struct yotta : units::prefix<yotta, "Y", ratio(1, 1, 24)> {};
struct zetta : units::prefix<zetta, prefix, "Z", ratio(1, 1, 21)> {};
struct yotta : units::prefix<yotta, prefix, "Y", ratio(1, 1, 24)> {};
} }
@@ -257,14 +236,12 @@ domain::
namespace iec80000 { namespace iec80000 {
struct binary_prefix : prefix_family {}; struct kibi : units::prefix<kibi, "Ki", ratio( 1'024)> {};
struct mebi : units::prefix<mebi, "Mi", ratio( 1'048'576)> {};
struct kibi : units::prefix<kibi, binary_prefix, "Ki", ratio( 1'024)> {}; struct gibi : units::prefix<gibi, "Gi", ratio( 1'073'741'824)> {};
struct mebi : units::prefix<mebi, binary_prefix, "Mi", ratio( 1'048'576)> {}; struct tebi : units::prefix<tebi, "Ti", ratio( 1'099'511'627'776)> {};
struct gibi : units::prefix<gibi, binary_prefix, "Gi", ratio( 1'073'741'824)> {}; struct pebi : units::prefix<pebi, "Pi", ratio( 1'125'899'906'842'624)> {};
struct tebi : units::prefix<tebi, binary_prefix, "Ti", ratio( 1'099'511'627'776)> {}; struct exbi : units::prefix<exbi, "Ei", ratio(1'152'921'504'606'846'976)> {};
struct pebi : units::prefix<pebi, binary_prefix, "Pi", ratio( 1'125'899'906'842'624)> {};
struct exbi : units::prefix<exbi, binary_prefix, "Ei", ratio(1'152'921'504'606'846'976)> {};
} }
@@ -338,7 +315,7 @@ will result in a different unnamed unit symbol:
where ``kilogram_metre_per_second`` is defined as:: where ``kilogram_metre_per_second`` is defined as::
struct kilogram_metre_per_second : unit<kilogram_metre_per_second> {}; struct kilogram_metre_per_second : derived_unit<kilogram_metre_per_second> {};
However, the easiest way to define momentum is just to use the However, the easiest way to define momentum is just to use the
``si::dim_speed`` derived dimension in the recipe: ``si::dim_speed`` derived dimension in the recipe:
@@ -385,12 +362,12 @@ ratio in reference to the "metre per second":
Whichever, we choose there will always be someone not happy with our choice. Whichever, we choose there will always be someone not happy with our choice.
Thanks to a `derived_unit` class template provided by the library this problem Thanks to a `derived_scaled_unit` class template provided by the library this problem
does not exist at all. With it ``si::kilometre_per_hour`` can be defined as:: does not exist at all. With it ``si::kilometre_per_hour`` can be defined as::
namespace si { namespace si {
struct kilometre_per_hour : derived_unit<kilometre_per_hour, dim_speed, kilometre, hour> {}; struct kilometre_per_hour : derived_scaled_unit<kilometre_per_hour, dim_speed, kilometre, hour> {};
} }
@@ -400,7 +377,7 @@ by him/her-self::
namespace si::fps { namespace si::fps {
struct knot : named_derived_unit<knot, dim_speed, "knot", no_prefix, nautical_mile, hour> {}; struct knot : named_derived_unit<knot, dim_speed, "knot", nautical_mile, hour> {};
} }

9
docs/reference/core/concepts.rst
View File

@@ -8,10 +8,6 @@ Concepts
All names defined in this chapter reside in the :any:`units` namespace unless All names defined in this chapter reside in the :any:`units` namespace unless
specified otherwise. specified otherwise.
.. concept:: template<typename T> PrefixFamily
A concept matching a prefix family. Satisfied by all types derived from :class:`prefix_family`.
.. concept:: template<typename T> Prefix .. concept:: template<typename T> Prefix
A concept matching a symbol prefix. Satisfied by all instantiations of :struct:`prefix`. A concept matching a symbol prefix. Satisfied by all instantiations of :struct:`prefix`.
@@ -44,6 +40,11 @@ Concepts
A concept matching all unit types in the library. Satisfied by all unit types derived A concept matching all unit types in the library. Satisfied by all unit types derived
from the instantiation of :class:`scaled_unit`. from the instantiation of :class:`scaled_unit`.
.. concept:: template<typename T> NamedUnit
A concept matching all unit types that have an atomic text symbol that can be used to aggregate it with
other named units to form a final symbol of a derived unit.
.. concept:: template<typename U, typename D> UnitOf .. concept:: template<typename U, typename D> UnitOf
A concept matching only units of a specified dimension. Satisfied by all unit types that A concept matching only units of a specified dimension. Satisfied by all unit types that

6
docs/reference/core/types/prefixes.rst
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@@ -1,11 +1,5 @@
Prefixes Prefixes
======== ========
.. doxygenstruct:: units::prefix_family
:members:
.. doxygenstruct:: units::no_prefix
:members:
.. doxygenstruct:: units::prefix .. doxygenstruct:: units::prefix
:members: :members:

5
docs/reference/core/types/units.rst
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@@ -4,9 +4,6 @@ Units
.. doxygenstruct:: units::scaled_unit .. doxygenstruct:: units::scaled_unit
:members: :members:
.. doxygenstruct:: units::unit
:members:
.. doxygenstruct:: units::named_unit .. doxygenstruct:: units::named_unit
:members: :members:
@@ -19,7 +16,7 @@ Units
.. doxygenstruct:: units::derived_unit .. doxygenstruct:: units::derived_unit
:members: :members:
.. doxygenstruct:: units::named_derived_unit .. doxygenstruct:: units::derived_scaled_unit
:members: :members:
.. doxygenstruct:: units::alias_unit .. doxygenstruct:: units::alias_unit

44
docs/use_cases/extensions.rst
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@@ -22,7 +22,7 @@ Defining a New Unit
My working desk is of ``180 cm x 60 cm`` which gives an area of ``0.3 m²``. I would like to My working desk is of ``180 cm x 60 cm`` which gives an area of ``0.3 m²``. I would like to
make it a unit of area for my project:: make it a unit of area for my project::
struct desk : named_scaled_unit<desk, "desk", no_prefix, ratio(3, 10), si::square_metre> {}; struct desk : named_scaled_unit<desk, "desk", ratio(3, 10), si::square_metre> {};
With the above I can define a quantity with the area of ``2 desks``:: With the above I can define a quantity with the area of ``2 desks``::
@@ -56,28 +56,22 @@ In case I would like to check how much area ``6 desks`` take in SI units::
Enabling a Unit for Prefixing Enabling a Unit for Prefixing
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
In case I decide it is reasonable to express my desks with SI prefixes the only thing I have In case I decide it is reasonable to express my desks with SI prefixes, I can define
to change in the above code is to replace `no_prefix` with `isq::si::prefix`:: a new unit named ``kilodesk``::
struct desk : named_scaled_unit<desk, "desk", si::prefix, ratio(3, 10), si::square_metre> {};
Now I can define a new unit named ``kilodesk``::
struct kilodesk : prefixed_unit<kilodesk, si::kilo, desk> {}; struct kilodesk : prefixed_unit<kilodesk, si::kilo, desk> {};
static_assert(3_d * 1000 == si::area<kilodesk>(3)); static_assert(3_d * 1000 == si::area<kilodesk>(3));
But maybe SI prefixes are not good for me. Maybe I always pack ``6`` desks into one package But maybe SI prefixes are not good for me. Maybe I always pack ``6`` desks into one package
for shipment and ``40`` such packages fit into my lorry. To express this with prefixes a new for shipment and ``40`` such packages fit into my lorry. To express this new prefix definitions
prefix family and prefixes are needed:: are needed::
struct shipping_prefix : prefix_family {}; struct package : prefix<package, "pkg", ratio(6)> {};
struct lorry : prefix<lorry, "lorry", ratio(6 * 40)> {};
struct package : prefix<package, shipping_prefix, "pkg", ratio(6)> {};
struct lorry : prefix<lorry, shipping_prefix, "lorry", ratio(6 * 40)> {};
Now we can use it for our unit:: Now we can use it for our unit::
struct desk : named_scaled_unit<desk, "desk", shipping_prefix, ratio(3, 10), si::square_metre> {}; struct desk : named_scaled_unit<desk, "desk", ratio(3, 10), si::square_metre> {};
struct packagedesk : prefixed_unit<packagedesk, package, desk> {}; struct packagedesk : prefixed_unit<packagedesk, package, desk> {};
struct lorrydesk : prefixed_unit<lorrydesk, lorry, desk> {}; struct lorrydesk : prefixed_unit<lorrydesk, lorry, desk> {};
@@ -111,14 +105,14 @@ rate of wood during production I need to define a new derived dimension together
coherent unit:: coherent unit::
// coherent unit must apply to the system rules (in this case SI) // coherent unit must apply to the system rules (in this case SI)
struct square_metre_per_second : unit<square_metre_per_second> {}; struct square_metre_per_second : derived_unit<square_metre_per_second> {};
// new derived dimensions // new derived dimensions
struct dim_desk_rate : derived_dimension<dim_desk_rate, square_metre_per_second, struct dim_desk_rate : derived_dimension<dim_desk_rate, square_metre_per_second,
exponent<si::dim_area, 1>, exponent<si::dim_time, -1>> {}; exponent<si::dim_area, 1>, exponent<si::dim_time, -1>> {};
// our unit of interest for a new derived dimension // our unit of interest for a new derived dimension
struct desk_per_hour : derived_unit<desk_per_hour, dim_desk_rate, desk, si::hour> {}; struct desk_per_hour : derived_scaled_unit<desk_per_hour, dim_desk_rate, desk, si::hour> {};
// a quantity of our dimension // a quantity of our dimension
template<UnitOf<dim_desk_rate> U, Representation Rep = double> template<UnitOf<dim_desk_rate> U, Representation Rep = double>
@@ -147,7 +141,7 @@ a customer's office I would need a unit called ``person_per_desk`` of a new deri
dimension. However, our library does not know what a ``person`` is. For this I need to dimension. However, our library does not know what a ``person`` is. For this I need to
define a new base dimension, its units, quantity helper, concept, and UDLs:: define a new base dimension, its units, quantity helper, concept, and UDLs::
struct person : named_unit<person, "person", no_prefix> {}; struct person : named_unit<person, "person"> {};
struct dim_people : base_dimension<"people", person> {}; struct dim_people : base_dimension<"people", person> {};
template<UnitOf<dim_people> U, Representation Rep = double> template<UnitOf<dim_people> U, Representation Rep = double>
@@ -162,12 +156,12 @@ define a new base dimension, its units, quantity helper, concept, and UDLs::
With the above we can now define a new derived dimension:: With the above we can now define a new derived dimension::
struct person_per_square_metre : unit<person_per_square_metre> {}; struct person_per_square_metre : derived_unit<person_per_square_metre> {};
struct dim_occupancy_rate : derived_dimension<dim_occupancy_rate, person_per_square_metre, struct dim_occupancy_rate : derived_dimension<dim_occupancy_rate, person_per_square_metre,
exponent<dim_people, 1>, exponent<dim_people, 1>,
exponent<si::dim_area, -1>> {}; exponent<si::dim_area, -1>> {};
struct person_per_desk : derived_unit<person_per_desk, dim_occupancy_rate, person, desk> {}; struct person_per_desk : derived_scaled_unit<person_per_desk, dim_occupancy_rate, person, desk> {};
template<UnitOf<dim_occupancy_rate> U, Representation Rep = double> template<UnitOf<dim_occupancy_rate> U, Representation Rep = double>
using occupancy_rate = quantity<dim_occupancy_rate, U, Rep>; using occupancy_rate = quantity<dim_occupancy_rate, U, Rep>;
@@ -211,8 +205,8 @@ Such units do not share their references with base units of other systems:
namespace fps { namespace fps {
struct foot : named_unit<foot, "ft", no_prefix> {}; struct foot : named_unit<foot, "ft"> {};
struct yard : named_scaled_unit<yard, "yd", no_prefix, ratio(3), foot> {}; struct yard : named_scaled_unit<yard, "yd", ratio(3), foot> {};
struct dim_length : base_dimension<"L", foot> {}; struct dim_length : base_dimension<"L", foot> {};
@@ -231,7 +225,7 @@ different systems:
namespace si { namespace si {
struct metre : named_unit<metre, "m", units::isq::si::prefix> {}; struct metre : named_unit<metre, "m"> {};
struct kilometre : prefixed_unit<kilometre, units::isq::si::kilo, metre> {}; struct kilometre : prefixed_unit<kilometre, units::isq::si::kilo, metre> {};
struct dim_length : base_dimension<"L", metre> {}; struct dim_length : base_dimension<"L", metre> {};
@@ -241,8 +235,8 @@ different systems:
namespace fps { namespace fps {
struct foot : named_scaled_unit<foot, "ft", no_prefix, ratio(3'048, 1'000, -1), metre> {}; struct foot : named_scaled_unit<foot, "ft", ratio(3'048, 1'000, -1), metre> {};
struct yard : named_scaled_unit<yard, "yd", no_prefix, ratio(3), foot> {}; struct yard : named_scaled_unit<yard, "yd", ratio(3), foot> {};
struct dim_length : base_dimension<"L", foot> {}; struct dim_length : base_dimension<"L", foot> {};
@@ -300,7 +294,7 @@ the library always keeps the ratio relative to the primary reference unit
which in this case is ``si::metre``. This results in much bigger ratios which in this case is ``si::metre``. This results in much bigger ratios
and in case of some units may result with a problem of limited resolution and in case of some units may result with a problem of limited resolution
of ``std::int64_t`` used to store numerator, denominator, and exponent of ``std::int64_t`` used to store numerator, denominator, and exponent
values of ratio. For example the ``si::fps::qubic_foot`` already has the values of ratio. For example the ``si::fps::cubic_foot`` already has the
ratio of ``ratio{55306341, 1953125, -3}``. In case of more complicated ratio of ``ratio{55306341, 1953125, -3}``. In case of more complicated
conversion ratio we can overflow `ratio` and get a compile-time error. conversion ratio we can overflow `ratio` and get a compile-time error.
In such a situation the standalone system may be a better choice here. In such a situation the standalone system may be a better choice here.