v2.3.0 RC 1

Release Candidate 1 for v2.3.0

• Adds data units (bits/bytes) and data transfer units as first-class citizens
• Adds std::cout support for units with no defined abbreviation (they show up as a combination of SI base units)
• Adds compound assignment operators: +=, -=, /=, *=.
• Adds value() member for accessing underlying type.
• Adds value_type trait, as a synonym for underlying_type.
• Adds definitions for Julian and Gregorian years.

Notes:

• Provisionally removes compiler support for MSVC2013.
• No documentation updates are included in this candidate.

v2.2.0

New Features:

• Unit types and member functions are now constexpr and noexcept wherever possible.
• Added cpow<..>(), a constexpr power function.
• Added make_unit factory function.
• Added cmath hypot() function.
• Added optional definition to disable IOStream in embedded applications.

Improvements:

• New and improved pi constant
• units::time and std::chrono are now interoperable
• eliminated warnings on gcc when using -Wall -Wextra -pedantic

v2.1.3

New features:

• Added a CMake interface project so that units can be more easily included as a git submodule or CMake subdirectory.
• Added options to disable building unit tests and documentation.

Improvements:

• Removed all GNU dependencies
• Updated google test to version 1.8.0 and simplified the build process
• improved overall units compile time.

v2.1.2

Bug fixes:

• in-lined the decibel unit literals to prevent multiple definitions.
• changed inch abbreviation from inch to in

v2.1.1

Enhancements

• Adds clang support and testing (on linux).

v2.1.0

New features:

• Literal suffixes for instantiating unit containers (c++14 compliant compiler required).

  auto area = 3.0_m * 4.0_m;    // area == square_meter_t(12.0) ==   12_sq_m;

• std::cout output now includes the unit abbreviations.

  mile_t distance(26.2);
  std::cout << distance;    // printed: 26.2 mi

• Unit-to-built-in-type conversions using to<> or unit_cast.

  mile_t distance(26.2);
  double result = unit_cast<double>(distance); // result == 26.2

• Unit definition macros.

  UNIT_ADD(length, foot, feet, ft, unit<std::ratio<381, 1250>, meters>)

• Improvements for integral unit types.

Notes:

• Due to incompatibilites with the WINAPI, the literal abbreviation for tesla units are _Te, instead of the SI standard _T.

Tested on:

• gcc-4.9.3
• gcc-5.4.0
• msvc2013
• msvc2015

v2.0.3

Added unary minus (-) operator for unit_t types.

v2.0.2

made unit_t types trivial. Default constructed unit_t types are no longer guaranteed to be zero-valued.

v2.0.1

New features:

Supports a wider range of compilers

Tested on:

gcc-4.8.5
gcc-4.9.3
msvc2013
msvc2015

v2.0.0

New features:

Compile-time unit arithmetic via unit_value_t
Unit-enabled ports of most <cmath> functions, including c++11 extensions.
Square-root manipulators for unit, unit_t, and unit_value_t
Improved documentation

Tested on:

gcc -4.9
msvc2015