std::ranges:: common_range

From cppreference.com
C++
Ranges library
Range adaptors
Defined in header <ranges>
template < class T >

concept common_range =

ranges:: range < T > && std:: same_as < ranges:: iterator_t < T > , ranges:: sentinel_t < T >> ;
(since C++20)

The common_range concept is a refinement of range for which std::ranges::begin() and std::ranges::end() return the same type (e.g. all standard library containers).

Example

Run this code 
#include <ranges>
 
struct A
{
    char* begin();
    char* end();
};
static_assert( std::ranges::common_range<A> );
 
struct B
{
    char* begin();
    bool end();
};  // not a common_range: begin/end have different types
static_assert( not std::ranges::common_range<B> );
 
struct C
{
    char* begin();
};  // not a common_range, not even a range: has no end()
static_assert( not std::ranges::common_range<C> );
 
int main() {}

See also

(C++20)
converts a view into a common_range
(class template) (range adaptor object)
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