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std::experimental::ranges::CopyConstructible

From cppreference.com
< cpp‎ | experimental‎ | ranges
 
 
Technical specifications
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals 2 TS)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Concepts (concepts TS)
Ranges (ranges TS)
Special mathematical functions (special math TR)
 
 
Concepts library
Core language concepts
                              
Object concepts
CopyConstructible
                              
                              
Comparison concepts
Callable concepts
                                        
                              
URNG concept
 
template <class T>

concept bool CopyConstructible =
  ranges::MoveConstructible<T> &&
  ranges::Constructible<T, T&> && ranges::ConvertibleTo<T&, T> &&
  ranges::Constructible<T, const T&> && ranges::ConvertibleTo<const T&, T> &&

  ranges::Constructible<T, const T> && ranges::ConvertibleTo<const T, T>;
(ranges TS)

The concept CopyConstructible is satisfied if T is an lvalue reference type, or if it is a MoveConstructible object type where an object of that type can constructed from a (possibly const) lvalue or const rvalue of that type in both direct- and copy-initialization contexts with the usual semantics (a copy is constructed with the source unchanged).

More precisely, if T is an object type, then CopyConstructible<T> is satisfied only if given

  • v, a lvalue of type (possibly const) T or an rvalue of type const T,

the following are true:

  • After the definition T u = v;, u is equal to v;
  • T{v} is equal to v.

[edit] See also

checks if a type has a copy constructor
(class template) [edit]