Units Versions Save

What's Changed

• Fix incorrect math function output for scaled dimensionless types, v3.x edition by @ts826848 in https://github.com/nholthaus/units/pull/295
• fix locale unit test
• update gtest cmake
• add vs2019 to appveyor
• make .value() and .to<>() behave the same for scaled dimensionless units
• ensure consistency and testing of scaled dimensionless unit math functions

Full Changelog: https://github.com/nholthaus/units/compare/v3.0.0.beta...v3.0.0.beta.2

Fixes mil definition

Various fixes and improvements

• added support for nlohmann json
• NaN support
• add Gal unit of acceleration
• improved stream operators

Post name refactor

Many new features of v3.x implemeneted, including first-class support for integer units

Preview of version 3.0.0 featuring user-defined variadic dimensions.

No documentation updates yet.

New in v2.3.1

This version removes support for the Visual Studio 2013 compiler.

Features:

• units now include constexpr name() and abbreviation() member functions, which do not really on string/iostream.
• Builds with VS2017 Ninja generator out of the box
• string conversions are now locale aware
• added unary incremement and decremement operators (++,--), as well as unary + operator.

Bug fixs:

• fixed compilation error when iostream was disabled

features:

• 5x compile time improvement on MSVC.
• 1.5x compile time improvement on GCC.
• Even more dramatic reductions in compile time can be acheived if you opt-in to specific unit definitions instead of using all the library-defined types (which is the default value). Check out Enabling a subset of units to improve compilation time for instructions.
• Adds std::cout support for units with no defined abbreviation (they show up as a combination of SI base units)
• Support for std::numeric_limits of unit types.
• Assignment operators for unit types: -=, +=, /=, *=.
• Added min and max overloads for units types in units::math.
• Added to_string function and abbreviation functions:

  auto len = 3.5_m;
  auto str = units::length::to_string(len);
  auto abv = units::length::abbreviation(len);
  
  std::cout << str;  // prints "3.5 m"
  std::cout << abv;  // prints "m"
  

• Added units of data and data transfer: bits, bytes, bits_per_second, and bytes_per_second.
• Adds value() member for accessing underlying type.
• Adds value_type trait, as a synonym for underlying_type.
• Adds definitions for Julian and Gregorian years.
• Thanks to @dinocore1, units now supports cmake install and find_packages. From the pull request:

  # To have cmake install units library to a local 'install' directory:
  mkdir build
  cd build
  cmake -DCMAKE_INSTALL_PREFIX="install" ..
  cmake --build . --target install
  # The units library can then be used in some other cmake project using 
  # the standard 'find_package' command. Like so:
  find_package(units)
  

Bug fixes:

• Fixed singualr name of siemen to be siemens (Thanks @Oxyd)
• Fixed bug with cubrt operation (Thanks @PearCoding)
• fixed constexpr relational operators bug
• fixed exponential temperature conversions (Thanks @guarndt)

Improvements:

• 512% compile time improvement on MSVC.
• 165% compile time improvement on GCC.

Bug fixes:

• fixed constexpr relational operators bug (#63)

Notes:

• Retains VS2013 support
• No documentation updates are provided in this release candidate.