Mpusz Units Versions Save

• (!) feat: inverse() support added for dimensions, quantity_spec, units, and references (1 / s will now create quantity and not a Unit)
• (!) feat: quantity_point does not provide zero() anymore
• (!) feat: quantity_spec and its kind should not compare equal
• (!) feat: mutating interface removed from fixed_string
• (!) feat: common_type with a raw value is not needed anymore as for a long time now raw values are not convertible to the dimensionless quantities
• (!) feat: symbol_text definition simplified
• (!) feat: users are now allowed to inherit their own types from absolute point origins
• (!) feat: interoperability with other libraries redesigned
• feat: basic_fixed_string(const CharT*, std::integral_constant<std::size_t, N>) constructor added
• feat: isq::activity added and becquerel definition updated to benefit from it
• feat: gray and sievert now have correct associated quantity kinds
• feat: UnitCompatibleWith concept added and applied to in(U) and force_in(U) functions
• feat: quantities can now be multiplied and divided by units (no parenthesis needed anymore)
• feat: Magnitude / Unit operator added
• feat: equality for dimensions now will allow derived classes as well (but not from derived_dimension)
• feat: zero_Fahrenheit point origin added
• feat: equivalent point origins handling improved
• feat(example): unit symbols added to the currency example
• (!) refactor: unit_symbol<fmt>(U) signature refactored and the resulting text can now also be used at runtime
• (!) refactor: make_xxx factory functions replaced with two-parameter constructors
• (!) refactor: unit_symbol changed to consteval
• refactor: in(U) and force_in(U) now return auto to provide better diagnostics on clang
• refactor: quantity operators constraints refactored
• refactor: more type members added to fixed_string definition
• refactor: unit_symbol_formatting enums now use std::int8_t as a representation type
• fix: symbols of named dimensionless units with the ratio = 1 were not printed
• fix: iterator is now properly updated for all cases in unit_symbol
• fix: Fahrenheit conversion ratio was inverted
• fix: CommonlyInvocableQuantities was overconstrained for the current library design
• fix: are_ingredients_convertible now mandates explicit conversion for To dimensionless quantities
• fix: quantity_point::point_for(PO) constraints fixed
• fix(example): latitude and longitude fixed to include 0 for N and E respectively
• ci: clang-17 enabled
• ci: apple-clang-15 enabled
• ci: Added C++23 builds to the CI matrix
• docs: "Getting Started" chapters updated
• docs: "Basic Concepts" and "Interface Introduction" chapters updated
• docs: "Design Overview" chapter added and "Concepts" chapter reworked
• docs: "Output stream formatting" chapter updated
• docs: "Default formatting" chapter updated
• docs: "Derived unit symbols generation" chapter added
• docs: outdated affine space chapter updated
• docs: CameCase concept identifiers FAQ added
• docs: gravitational_potential_energy equation fixed on a graph
• docs: YouTube video link updated to the C++ on Sea 2023
• docs: ISO papers reference added to docs and README
• docs: a representation type in a dimensionless quantity FAQ fixed
• docs: titles added to some important admonitions
• docs: "Terms and Definitions" slightly updated
• docs: "canonical unit" added to glossary and its documentation in code was updated
• docs: Design overview graph updated

IMPORTANT: This is a breaking release. The mp-units library got totally new look & feel with the V2 engine.

• units namespace renamed to mp_units (#317)
• header files in the <mp-units/...> rather then in <units/...> (#317)
• the downcasting facility is removed (#383, #211, #32)
• unified and simplified quantity creation (#274)
• determining the best way to create a quantity (#413)
• V2 quantity_point (#414)
• introduction of quantity_spec to store not only dimension but also additional information about quantities (#405)
• quantity now takes reference object, which aggregates quantity_spec and a unit and a representation type
• units, prefixes, dimensions, quantity specifications, and references are passed as NTTPs to templates and provide arithmetic operations and comparison
• expression templates consistently used in all derived types to increase the readability (#351, #166)
• derived dimensions are now factors of only base dimensions (#281)
• convertibility of derived quantities (#427)
• dimensions, quantity specifications, units, and references are now composable, significantly reducing the number of definitions and resulting types
• heavily simplified unit systems definitions (no need to define unnamed derived units, systems-specific dimensions, aliases for quantities, concepts, UDLs, ... anymore)
• improved definition of all systems
• support for ISO 80000 Part 3-6 quantities
• faster than lightspeed constants (#169)
• extensions to quantity formatting with fmt
• quantity_kind removed
• improved casting of unit with .in(Unit), .force_in(Unit) for quantity and quantity_spec
• numerical value accessor safety improved with .numerical_value_in(Unit) and .force_numerical_value_in(Unit)
• quantity can no longer be constructed with a raw value (#434)
• Implicit construction of quantities from a value (#410)
• quantity_point can no longer be constructed with just a quantity and an explicit PointOrigin is always needed
• ceil and floor are dangerous (#432)
• quecto, ronto, ronna, quetta new SI prefixes support
• comparison against zero added (#487)
• documentation rewritten from scratch
• many smaller changes not possible to address with the previous design (#205, #210, #134)

• (!) refactor: common_quantity, common_quantity_for, common_quantity_point, common_quantity_kind, and common_quantity_point_kind removed
• (!) refactor: named_derived_unit removed as it was not used
• (!) refactor: derived_unit renamed to derived_scaled_unit
• (!) refactor: unit renamed to derived_unit
• (!) refactor: U::is_named removed from the unit types and replaced with NamedUnit concept
• (!) refactor: PrefixFamily support removed
• (!) refactor: mi(naut) renamed to nmi
• (!) refactor: knot unit helper renamed to kn in FPS
• (!) refactor: knot text symbol changed from "knot" to "kn"
• refactor: quantity op+() and op-() reimplemented in terms of reference rather then quantity types
• refactor(example): glide_computer now use dimensionless quantities with ranged_representation as rep
• feat: HEP system support added (thanks @RalphSteinhagen)
• feat: floor(), ceil(), and round() support added (thanks @hofbi)
• feat: std::format support for compliant compilers added
• feat: conversion helpers from mp-units to std::chrono types added
• feat: math functions can now be safely used with user-defined types
• feat: conversion from quantity_point to std::chrono::time_point added
• feat: nautical_mile_per_hour and knot added to si::international system
• (!) fix: add quantity_point::origin, like std::chrono::time_point::clock
• fix: enable any prefixes for most of the named units (beside those that use prefixes already)
• fix: hectare definition fixed to be a prefixed version of are + other units
• fix: account for different dimensions in quantity_point_cast's constraint
• fix: output stream operator now properly handles state
• fix: fmt algorithms were overconstrained with forward_iterator
• fix: CTAD for aliases fixed
• fix: derived_ratio calculation
• fix: fill_t assignment operator fixed
• fix: improve downcast mode off
• fix: radioactivity header compilation fixed
• fix: si::hep::dim_momentum duplicated definition fixed
• fix: fps can now coexist with international system
• fix: public headers fixed to be standalone
• test: standalone public headers tests added
• (!) build: CMake generator in Conan is no longer obtained from an environment variable
• (!) build: Required Conan version bumped to 1.48
• (!) build: Conan 1.48 does not set CMAKE_BUILD_TYPE in the conan_toolchain.cmake anymore
• build: AppleClang 13 support added (thanks @fdischner)
• build: most of the conanfile.py refactored to be Conan 2.0 ready
• build: validate() replaced with configure() to raise errors during conan install in Conan 1.X
• build: minimum Conan version changed to 1.40
• build: linear-algebra Conan repo is no needed anymore
• build: Gitpod support added
• build: clang-format-15 support added
• build: export config to local build (#322)
• build: fix export name of mp-units-system
• build: fmt updated to 8.0.1
• build: gsl-lite updated to 0.40.0
• build: catch2 updated to 2.13.9
• build: doxygen updated to 1.9.4
• build: linear_algebra/0.7.0 switched to wg21-linear_algebra/0.7.2
• ci: VS2022, gcc-11, clang-13, clang-14, and AppleClang 13 support added
• ci: pre-commit support added (thanks @hofbi)
• docs: Project documentation updated
• docs: CITATION.cff file added
• docs: CONTRIBUTING.md updated

• (!) refactor: ScalableNumber renamed to Representation
• (!) refactor: output stream operators moved to the units/quantity_io.h header file
• (!) refactor: Refactored the library file tree
• (!) refactor: quantity::count() renamed to quantity::number()
• (!) refactor: data system renamed to isq::iec80000 (quantity names renamed too)
• (!) refactor: *deduced_unit renamed to *derived_unit
• (!) refactor: got rid of a noble_derived_unit
• refactor: quantity (kind) point updated to reflect latest changes to quantity
• refactor: basic concepts, quantity and quantity_cast refactored
• refactor: abs() definition refactored to be more explicit about the return type
• feat: quantity (point) kind support added (thanks @johelegp)
• feat: quantity references support added (thanks @johelegp)
• feat: quantity aliases support addded
• feat: interoperability with std::chrono::duration and other units libraries
• feat: CTAD for dimensionless quantity added
• feat: modulation_rate support added (thanks @go2sh)
• feat: SI prefixes for isq::iec80000 support added (thanks @go2sh)
• feat: a possibility to disable quantity UDLs support with UNITS_NO_LITERALS preprocessor define
• feat: a support to define ISQ derived dimensions in terms of different number or order of components
• perf: preconditions check do not influence the runtime performance of a Release build
• perf: quantity_cast() generates less assembly instructions
• perf: temporary string creation removed from quantity::op<<()
• perf: value initialization for quantity value removed (left with a default initialization)
• perf: limited the equivalent trait usage
• perf: limited the C++ Standard Library headers usage
• perf: rvalue references support added for constructors and getters
• (!) fix: exp() has sense only for dimensionless quantities
• (!) fix: dim_torque now properly divides by an angle (instead of multiply) + default unit name change
• fix: quantity's operators fixed to behave like the underlying types do
• fix: quantity_cast() fixed to work correctly with representation types not convertible from std::intmax_t
• fix: ambiguous case for empty type list resolved
• fix: downcasting facility for non-default-constructible types
• fix: restore user-warnings within the library implementation
• fix: the text symbol of foot_pound_force and foot_pound_force_per_second
• fix: quantity modulo arithmetics fixed
• (!) build: Conan testing version is now hosted on Artifactory
• (!) build: Linear Algebra is now hosted on its Artifactory
• (!) build: BUILD_DOCS CMake option renamed to UNITS_BUILD_DOCS
• build: doxygen updated to 1.8.20
• build: catch2 updated to 2.13.4
• build: fmt updated to 7.1.3
• build: ms-gsl replaced with gsl-lite/0.38.0
• build: Conan generator switched to cmake_find_package_multi
• build: Conan CMakeToolchain support added
• build: CMake scripts cleanup
• build: ccache support added
• ci: CI switched from Travis CI to GitHub Actions

• feat: quantity_point support added (thanks @johelegp)
• feat: Added angle as SI base dimension (thanks @kwikius)
• feat: si::angular_velocity support added (thanks @mikeford3)
• feat: FPS system added (thanks @mikeford3)
• feat: Added support for mathematical function exp(quantity)
• feat: Localization support for text output added (thanks @rbrugo)
• feat: Added STL random number distribution wrappers (thanks @yasamoka)
• (!) refactor: Refactored and cleaned up the library file tree
• (!) refactor: q_* UDL renamed to _q_*
• (!) refactor: UDLs with "per" in name renamed from *p* to *_per_*
• (!) refactor: ratio changed to the NTTP kind
• (!) refactor: exp and Exp renamed to exponent and Exponent
• (!) refactor: Scalar concept renamed to ScalableNumber
• (!) refactor: Dimensionless quantities redesigned to be of a quantity type
• refactor: math.h function signatures refactored to use a Quantity concept (thanks @kwikius)
• refactor: [[nodiscard]] added to many functions
• fix: si::day unit symbol fixed to d (thanks @komputerwiz)
• fix: si::mole unit symbol fixed to mol (thanks @mikeford3)
• (!) build: gcc-9 is no longer supported (at least gcc-10 is required)
• build: Visual Studio 16.7 support added
• build: linear_algebra updated to 0.7.0/stable
• build: fmt updated to 7.0.3
• build: range-v3 updated to 0.11.0
• build: catch2 updated to 2.13.0
• build: doxygen updated to 1.8.18
• build: ms-gsl 3.1.0 dependency added
• build: Removed the dependency on a git submodule with common CMake scripts

• Major refactoring and rewrite of the library
• Units are now independent from dimensions
• Dimensions now depend on units (base or coherent units are provided in a class template)
• Quantity gets a Dimension template parameter again (as unit does not provide information about its dimension anymore)
• Spaceship operator support added
• Added official CGS system support
• Added official data information system support
• Repository file tree cleanup
• ratio refactored to contain Exp template parameter (thanks a lot @oschonrock!)
• SI fundamental constants added
• q_ prefix applied to all the UDLs (thanks @kwikius)
• unknown_unit renamed to unknown_coherent_unit
• Project documentation greatly extended and switched to Sphinx
• A few more usage examples added
• ASCII-only output support added (thanks @yasamoka)
• Representation values formatting extended (thanks @rbrugo)
• Output streams formatting support added
• Linear algebra from std::experimental::math support added
• Named SI units and their dimensions added (thanks @rbrugo
• libfmt updated to 6.2.0
• Added absolute functions and epsilon to math.h (thanks @mikeford3)
• Added a lot of prefixes to named units and introduced alias_unit (thanks @yasamoka)
• Linking with Conan targets only when they exists (#98)
• All physical dimensions and units put into physical namespace
• CMake improvements
• Velocity renamed to speed

Many thanks to GitHub users @oschonrock, @kwikius, and @i-ky for their support in drafting a new library design.

• Support for derived dimensions in exp added
• Added pow() and sqrt() operations on quantities
• units removed from a std::experimental namespace
• Downcasting facility refactored so the user does not have to write the boilerplate code anymore
• From now on base dimensions should inherit from base_dimension class template
• Added unit symbols definitions to base_dimension and derived units
• Added support for operator<< on quantity
• fmt support added
• Derived unit factory helpers refactored
• Refactored the way prefixed units are defined

• cmcstl2 dependency changed to range-v3 0.9.1

• Initial library release
• Begin semantic versioning
• The last version to work with gcc-8

• The design as described on C++Now 2019 talk (https://youtu.be/wKchCktZPHU)
• Added C++20 features supported by gcc-9.1 (std::remove_cvref_t, down with typename, std::type_identity)
• Compile-time performance optimizations (type_list, common_ratio, ratio, conditional_t)