< Krita
Revision as of 01:52, 15 October 2015 by Miabrahams (talk | contribs) (List some features which will probably not be used)
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General links to about using C++11

There have been a few links discussing mixing C++11 with Qt, and starting with Qt 5.6 C++11 support will be default. Note: as would be expected from those interested in hot new technology, the writers of most of these links demonstrate Silicon Valley levels of extreme optimism. Take this with a grain of salt: there is no such thing as a free lunch.

Particular Features

Under "drawbacks," every item should list: "Programmers will face another feature they must learn about."

Type Inference (auto)

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Range-based for loop

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General Initializer Lists

Motivation: Member Initializers Mixed uniform initialization

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Lambdas

Motivation: Lambda expressions for slots

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constexpr

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Override and final

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<algorithm>

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enum class

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nullptr

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Deleted and default class members

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unique_ptr

Motivation:

Drawbacks: unique_ptr is unable to be copied, and therefore cannot be used inside Qt classes. For example QVector<std::unique_ptr> is invalid, because QVector requires its members can be copied. This makes converting to unique_ptr a bit slow, since QVector<T *> will have to be converted to std_array<unique_ptr<T*>>, and the owner will no.

Recommendation:

Performance-related (rvalues)

http://thbecker.net/articles/rvalue_references/section_01.html

Move Constructors

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Reference Qualifiers

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C++11 features mostly for template programming

Krita makes very light use of templates. These features are useful, coming across them in the code base will add complexity for new learners, and have not been necessary so far.

  • decltype
  • static_assert
  • std::function and std::bind
  • variadic templates

Other C++11 features that probably cannot be used

  • Threads (Qt/KDE use an incompatible threading model)
  • shared_ptr and weak_ptr (Relies on C++ threading model; use KisSharedPointer)
  • New literal types (already have QString)
  • Extended Unions (already have QVariant)

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