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Showing content from https://en.cppreference.com/w/cpp/language/../keyword/../ranges/common_range.html below:

std::ranges::common_range - cppreference.com

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).

#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() {}

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