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// Copyright 2025 Steven Le Rouzic
//
// SPDX-License-Identifier: BSD-3-Clause
#include "asl/base/utility.hpp"
#include "asl/testing/testing.hpp"
template<typename T> static constexpr int identify(const T&) { return 1; }
template<typename T> static constexpr int identify(const T&&) { return 2; }
template<typename T> static constexpr int identify(T&) { return 3; }
template<typename T> static constexpr int identify(T&&) { return 4; }
struct IdentifySelf
{
constexpr int get(this auto&& self) { return identify(std::forward<decltype(self)>(self)); }
};
static int get_const_lref(const IdentifySelf& i) { return i.get(); }
static int get_const_rref(const IdentifySelf&& i) { return std::move(i).get(); } // NOLINT
static int get_lref(IdentifySelf& i) { return i.get(); }
static int get_rref(IdentifySelf&& i) { return std::move(i).get(); } // NOLINT
ASL_TEST(forward)
{
IdentifySelf id{};
ASL_TEST_EXPECT(get_const_lref(IdentifySelf{}) == 1);
ASL_TEST_EXPECT(get_lref(id) == 3);
ASL_TEST_EXPECT(get_const_rref(IdentifySelf{}) == 2);
ASL_TEST_EXPECT(get_rref(IdentifySelf{}) == 4);
}
ASL_TEST(move)
{
IdentifySelf id;
ASL_TEST_EXPECT(id.get() == 3);
ASL_TEST_EXPECT(IdentifySelf{}.get() == 4);
}
struct Level1
{
IdentifySelf id;
};
struct Level2
{
Level1 deeper;
};
struct Level3
{
Level2 deeper;
};
static int get_const_lref(const Level3& i) { return i.deeper.deeper.id.get(); }
static int get_const_rref(const Level3&& i) { return std::move(i).deeper.deeper.id.get(); }
static int get_lref(Level3& i) { return i.deeper.deeper.id.get(); }
static int get_rref(Level3&& i) { return std::move(i).deeper.deeper.id.get(); }
ASL_TEST(forward2)
{
Level3 id{};
ASL_TEST_EXPECT(get_const_lref(id) == 1);
ASL_TEST_EXPECT(get_lref(id) == 3);
ASL_TEST_EXPECT(get_const_rref(Level3{}) == 2);
ASL_TEST_EXPECT(get_rref(Level3{}) == 4);
}
template<typename T>
static int test_fwd_like(T) // NOLINT
{
const IdentifySelf id;
return std::forward_like<T>(id).get();
}
ASL_TEST(forward_like)
{
int x{};
ASL_TEST_EXPECT(test_fwd_like<const int&>(7) == 1);
ASL_TEST_EXPECT(test_fwd_like<int&>(x) == 3);
ASL_TEST_EXPECT(test_fwd_like<const int&&>(8) == 2);
ASL_TEST_EXPECT(test_fwd_like<int&&>(9) == 4);
}
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