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By Adrien Hamelin | Jul 20, 2020 09:30 AM | Tags: basics
Quick A: there is no guarantee for a container to work with incomplete types.
Recently on SO:
Recursive unordered_map
STL containers are not required to work with incomplete types. If you don't mind extra indirection, then the workaround is
std::map<int, std::unique_ptr<Node>>.
By Meeting C++ | Jul 17, 2020 04:53 AM | Tags: meetingcpp community
8 years ago in 2012, Meeting C++ got started!
8 years of Meeting C++
by Jens Weller
From the article:
In 2012 Meeting C++ got started in July. Planned first to be a one off conference, now it is a successfull international conference and a platform for C++ on the internet.
By Adrien Hamelin | Jul 16, 2020 12:06 PM | Tags: c++20
The series continue.
Two new Keywords in C++20: consteval and constinit
by Rainer Grimm
From the article:
With C++20 we get two new keywords: consteval and constinit. consteval produces a function that is executed at compile-time and constinit guarantees that a variable is initialized at compile-time...
By Adrien Hamelin | Jul 16, 2020 12:03 PM | Tags: basics
Quick A: Do you need it?
Recently on SO:
Is it possible to make template specialization for zero template arguments?
If T is used only for the constructor, you don't need to template the whole class;
By Hitesh Kumar | Jul 11, 2020 01:26 PM | Tags: c++11
C++11 scoped enums deep dive and comparison with C++98 unscoped enums.
Scoped (class) enums: fundamentals and examples
by Hitesh Kumar
From the article:
Scoped enums (enum class/struct) are strongly typed enumerations introduced in C++11. They address several shortcomings of the old C-style (C++98) enums, mainly associated with type-safety and name collisions.
By Adrien Hamelin | Jul 8, 2020 01:31 PM | Tags: c++20
The series continue.
Designated Initializers
by Rainer Grimm
From the article:
Designated initialization is an extension of aggregate initialization and empowers you to directly initialize the members of a class type using their names...
By Adrien Hamelin | Jun 30, 2020 10:05 AM | Tags: c++17
Did you know them?
Polymorphic Allocators, std::vector Growth and Hacking
by Bartlomiej Filipek
From the article:
The concept of a polymorphic allocator from C++17 is an enhancement to standard allocators from the Standard Library.
It’s much easier to use than a regular allocator and allows containers to have the same type while having a different allocator, or even a possibility to change allocators at runtime.
Let’s see how we can use it and hack to see the growth of std::vector containers...
By Adrien Hamelin | Jun 30, 2020 10:03 AM | Tags: c++11
The series continue.
Stupid std::tuple tricks: Finding a type in a tuple
by Raymond Chen
From the article:
Given a tuple, you can extract the type of the Nth element in the tuple with the help of std::tuple_element_t<N, Tuple>...
By Adrien Hamelin | Jun 29, 2020 08:35 AM | Tags: c++11
The series continue.
Stupid std::tuple tricks: Creating more interesting index sequences
by Raymond Chen
From the article:
Last time, we wrote offset_sequence_t, which takes an existing sequence and adds a fixed value to each element. This is the sort of index manipulation you may want to generalize. So let’s generalize it...
By Adrien Hamelin | Jun 29, 2020 08:34 AM | Tags: c++11
The series continue.
Stupid std::tuple tricks: Creating interesting index sequences
by Raymond Chen
From the article:
We saw last time that manipulating tuples boils down to the index_sequence. The problem is that the C++ standard library doesn’t provide very much in the way of helpers to manipulate these index sequences...