std::experimental::ranges::Readable

From cppreference.com
< cpp‎ | experimental‎ | ranges
Experimental
Technical Specification
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)
Experimental Non-TS
Pattern Matching
Linear Algebra
std::execution
Contracts
2D Graphics
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.