Upcoming Boost.Fit Review (September 8th-17th)

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Upcoming Boost.Fit Review (September 8th-17th)

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Hi everyone,

This coming Friday, September 8th, marks the start of review of the Fit
library by Paul Fultz II.

Source: https://github.com/pfultz2/Fit
Docs: http://fit.readthedocs.org/

This is the second time that the library will go through the review
process, with the previous time being in March of 2016. The result of the
initial review can be found here:

In this second review, those who choose to participate should be as
rigorous as they'd be in any other review, but are also encouraged to voice
whether or not the concerns from March of 2016 were addressed.

The following is a brief description of the library from its author:


Fit is a header-only C++11/C++14 library that provides utilities for
functions and function objects, which can solve many problems with much
simpler constructs than whats traditionally been done with metaprogramming.

Fit is:

   - Modern: Fit takes advantages of modern C++11/C++14 features. It
   support both constexpr initialization and constexpr evaluation of
   functions. It takes advantage of type deduction, varidiac templates, and
   perfect forwarding to provide a simple and modern interface.
   - Relevant: Fit provides utilities for functions and does not try to
   implement a functional language in C++. As such, Fit solves many problems
   relevant to C++ programmers, including initialization of function objects
   and lambdas, overloading with ordering, improved return type deduction, and
   much more.
   - Lightweight: Fit builds simple lightweight abstraction on top of
   function objects. It does not require subscribing to an entire framework.
   Just use the parts you need.

Fit is divided into three components:

   - Function Adaptors and Decorators: These enhance functions with
   additional capability.
   - Functions: These return functions that achieve a specific purpose.
   - Utilities: These are general utilities that are useful when defining
   or using functions.


This requires a C++11 compiler. There are no third-party dependencies. This
has been tested on clang 3.5-3.8, gcc 4.6-6.2, and Visual Studio 2015. Gcc
5.1 is not supported at all, however, gcc 5.4 is supported.
Contexpr support¶

Both MSVC and gcc 4.6 have limited constexpr support due to many bugs in
the implementation of constexpr. However, constexpr initialization of
functions is supported when using the FIT_STATIC_FUNCTION
<http://fit.readthedocs.io/en/latest/doc/src/FIT_STATIC_FUNCTION> and
Noexcept support¶

On older compilers such as gcc 4.6 and gcc 4.7, noexcept is not used due to
many bugs in the implementation. Also, most compilers don’t support
deducing noexcept with member function pointers. Only newer versions of
gcc(4.9 and later) support this.

Please take this time to become familiar with the Fit library before the
review takes place and feel free to respond in this thread with any
additional questions related to the library or its review. Thanks!

-Matt Calabrese

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