Default constructors - cppreference.com
4 May 2025 · An (until C++26) Otherwise, an (since C++26) implicitly-defined default constructor has the same effect as a user-defined constructor with empty body and empty initializer list. …
Constructors and member initializer lists - cppreference.com
21 May 2025 · Delegating constructor. If the name of the class itself appears as class-or-identifier in the member initializer list, then the list must consist of that one member initializer only; such …
Move constructors - cppreference.com
26 Sep 2024 · the move constructor selected for every non-static class type (or array of class type) member of T is trivial. A trivial move constructor is a constructor that performs the same …
Default-initialization - cppreference.com
23 Apr 2024 · The effects of default-initialization are: if T is a (possibly cv-qualified) non-POD (until C++11) class type, the constructors are considered and subjected to overload resolution …
List-initialization (since C++11) - cppreference.com
6 Aug 2024 · Otherwise, if the brace-enclosed initializer list has no initializer clause, T is value-initialized. [] List-initializing std::initializer_lisAn object of type std:: initializer_list < E > is …
Struct and union initialization - cppreference.com
26 Jan 2023 · When initializing a struct, the first initializer in the list initializes the first declared member (unless a designator is specified) (since C99), and all subsequent initializers without …
std::variant<Types...>::variant - cppreference.com
25 Jun 2024 · converting constructor blindly assembles an overload set, leading to unintended conversions narrowing and boolean conversions not considered P1957R2: C++17 converting …
Copy constructors - cppreference.com
4 Jun 2024 · The implicitly-declared (or defaulted on its first declaration) copy constructor has an exception specification as described in dynamic exception specification (until C++17) noexcept …
The rule of three/five/zero - cppreference.com
10 Mar 2025 · Rule of three. If a class requires a user-defined destructor, a user-defined copy constructor, or a user-defined copy assignment operator, it almost certainly requires all three.. …
Initialization - cppreference.com
31 Dec 2024 · Syntaxes (2-4) are collectively called brace-enclosed initializer list. [] Initializer semanticIf no initializer is specified for an object, the object is default-initialized.If no initializer …