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// SPDX-FileCopyrightText: 2006-2025 Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2025 Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
#include <cmath>
#include <seqan3/core/debug_stream.hpp>
//![concept]
// helper concept has_foo:
template <typename T>
concept has_foo = requires (T val) {
typename T::FOO; // requirement 1
val.foo; // requirement 2
};
// concept fooger:
template <typename T>
concept fooger = has_foo<T> && std::same_as<typename T::FOO, int>;
//![concept]
struct my_type
{
using FOO = int;
char foo{}; // foo can be of any type, here it is of type `char`
};
//![main]
int main()
{
seqan3::debug_stream << fooger<my_type> << std::endl; // should print 1
}
//![main]
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