< 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)
Iterators library
Iterator concepts
Indirect callable concepts
Common algorithm requirements
Concept utilities
Iterator utilities and operations
Iterator traits
Iterator adaptors
Stream iterators
template < class In >

concept bool Readable =
  requires {
    typename ranges::value_type_t<In>;
    typename ranges::reference_t<In>;
    typename ranges::rvalue_reference_t<In>;
  } &&
  CommonReference<ranges::reference_t<In>&&, ranges::value_type_t<In>&> &&
  CommonReference<ranges::reference_t<In>&&, ranges::rvalue_reference_t<In>&&> &&

  CommonReference<ranges::rvalue_reference_t<In>&&, const ranges::value_type_t<In>&>;
(ranges TS)

The concept Readable is satisfied by types that are readable by applying operator*, such as pointers, smart pointers, and iterators.