#include "catch_tmp.h"
#include <traits.h>

using namespace tmp;

TEST_CASE("void_t") {}
TEST_CASE("Void") {}

TEST_CASE("ReturnType") {
	REQUIRE_SAME(void, ReturnType<void()>);
	REQUIRE_SAME(void, ReturnType<void(int)>);
	REQUIRE_SAME(bool, ReturnType<bool()>);
	REQUIRE_SAME(bool&, ReturnType<bool&()>);
	REQUIRE_SAME(bool const&, ReturnType<bool const&()>);
	REQUIRE_SAME(void*, ReturnType<void*()>);
	REQUIRE_SAME(void const*, ReturnType<void const*()>);
	REQUIRE_SAME(void const*&, ReturnType<void const*&()>);
	REQUIRE_SAME(void const* const&, ReturnType<void const* const&()>);
}

TEST_CASE("Parameters") {
	REQUIRE_SAME(Pack<>, Parameters<void()>);

	SECTION("single parameter") {
		REQUIRE_SAME(Pack<int>, Parameters<void(int)>);

		REQUIRE_SAME(Pack<int>, Parameters<void(int const)>);

		REQUIRE_SAME(Pack<int&>, Parameters<void(int&)>);
		REQUIRE_SAME(Pack<int const&>, Parameters<void(int const&)>);
		REQUIRE_SAME(Pack<int*>, Parameters<void(int*)>);
		REQUIRE_SAME(Pack<int const*>, Parameters<void(int const*)>);
	}

	SECTION("multiple parameters") {
		using Input     = void(void*, char, bool, int);
		using Result    = Parameters<Input>;
		using Expected  = Pack<void*, char, bool, int>;

		REQUIRE_SAME(Expected, Result);
	}
}

TEST_CASE("invoke_result_t") {}

TEST_CASE("FunctionCat") {
	SECTION("empty lhs and rhs") {
		using Result    = FunctionCat<void(), void()>;
		using Expected  = void();

		REQUIRE_SAME(Expected, Result);
	}

	SECTION("empty lhs") {
		using Result    = FunctionCat<void(), void(char)>;
		using Expected  = void(char);

		REQUIRE_SAME(Expected, Result);
	}

	SECTION("empty rhs") {
		using Result    = FunctionCat<void(char), void()>;
		using Expected  = void(char);

		REQUIRE_SAME(Expected, Result);
	}

	SECTION("general case") {
		using Result    = FunctionCat<void(char, int), void(bool, char)>;
		using Expected  = void(char, int, bool, char);

		REQUIRE_SAME(Expected, Result);
	}
}