0.5.0

• 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.

0.4.0

• 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

0.3.1

• cmcstl2 dependency changed to range-v3 0.9.1

CppCon 2019 design

• The design as described on CppCon 2019 talk (https://youtu.be/0YW6yxkdhlU)
• Applied the feedback from the Cologne evening session
  • upcasting_traits renamed to downcasting_traits
  • Dimension template parameter removed from quantity
• units moved to a std::experimental namespace
• Leading underscore prefix removed from UDLs
• Added a few more derived dimensions
• meter renamed to metre
• Missing operator* added
• Predefined dimensions moved to a dedicated directory
• dimension_ prefix removed from names of derived dimensions
• cmcstl2 library updated to 2019.09.19
• base_dimension is a value provided as const& to the exp type
• integrated with Compiler Explorer
• gsl-lite dependency removed
• Fractional dimension exponents support added
• QuantityOf concept introduced
• quantity_cast<U, Rep>() support added

C++Now 2019 design

• 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)

0.1.0

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