std::experimental::ranges::Semiregular

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Technical specifications
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals TS v2)
Library fundamentals 3 (library fundamentals TS v3)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Extensions for concurrency 2 (concurrency TS v2)
Concepts (concepts TS)
Ranges (ranges TS)
Reflection (reflection TS)
Mathematical special functions (special functions TR)
 
 
Concepts library
Core language concepts
                              
Object concepts
                              
                              
Semiregular

Comparison concepts
Callable concepts
                                        
                              
URNG concept
 
template <class T>
concept bool Semiregular = Copyable<T> && DefaultConstructible<T>;
(ranges TS)

The Semiregular concept specifies that a type is both copyable and default constructible. It is satisfied by types that behave similarly to built-in types like int, except that they need not support comparison with ==.