UI Code Quality: Ghost C++ Coding-Style #74430
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UI Code Quality: Ghost C++ Coding-Style
NOTE: This is a proposal, not an agreed on plan.
Ghost probably wouldn't benefit too greatly from modern C++ usage, but there are a few features that might be handy. Changes proposed here should move us closer to following the C++ guidelines: http://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines.
We should not spend big amounts of time on this, especially since there are no major benefits to expect. It is however a nice, isolated place to introduce more modern C++ features to the UI code, for experimenting with it and to get developers familiar with the rather different coding style.
If this works well for us and we add more C++ to our UI code, we should follow the same rules.
blender::ghost
namespace (see style guide ).blender::
containers rather thanstd::
ones (see style guide ).override
,virtual
andfinal
keywords: Explicit usage of these terms in class hierarchies may prevent some errors. Especiallyoverride
andfinal
since they lead to a compile error on function signature mismatch (C.128).std::unique_ptr
: It's considered good practise to use smart pointers (esp.std::unique_ptr
) to manage lifetimes of C++ objects. They make object ownership explicit and enforce static sanity checks. ([R.1]], http:*isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rr-newdelete , [http://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rr-owner | R.20). We may want to add our ownmake_unique()
too, which is only available in C++17.default
anddelete
constructors and destructors: Using these may help catch some errors at compile time, make classes more compatible withstd
containers and allows optimizations for trivial operation (e.g. a= default
copy constructor makes a type "trivially copyable", which some containers and compilers optimize for) ([C.43]], http:*isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rc-eqdefault , [http://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rc-delete | C.81).std
containers in a few places. C++11 range-based for loops make iterating them far less verbose (ES.71).auto
to avoid verbosity/redundancy: While there are good reasons to be sceptical aboutauto
, there are few cases where they are definitely useful. For example in case of long type names (likestd::vector<std::unique_ptr<SomeType>>::const_iterator
). (ES.11)using
overtypedef
: Theusing
syntax to create aliases is often considered more readable. (T.43).nullptr
: More on the esthetical side of things (although may avoid some nasty surprises!), but we should use standardnullptr
instead ofNULL
. We can avoid includingstddef.h
everywhere then. (ES.47)Other, similar improvements are possible. These are just a few examples of low hanging fruits.
Added subscriber: @JulianEisel