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- // Test for concepts support. Not just the language feature; also headers.
- #include <iostream>
- #include <ranges>
- #include <vector>
- template<typename T>
- concept Foo = std::ranges::input_range<T>;
- template<Foo F> auto foo(F const &r)
- {
- return std::distance(std::begin(r), std::end(r));
- }
- int main()
- {
- std::vector<int> const v{1, 2, 3};
- std::cout << foo(v) << '\n';
- }
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