#include <fit/arg.hpp>
#include <fit/is_callable.hpp>
#include <type_traits>
#include "test.hpp"

FIT_TEST_CASE()
{
    FIT_STATIC_TEST_CHECK(fit::arg_c<3>(1,2,3,4,5) == 3);
    FIT_TEST_CHECK( fit::arg_c<3>(1,2,3,4,5) == 3 );
}

FIT_TEST_CASE()
{
    FIT_STATIC_TEST_CHECK(fit::arg(std::integral_constant<int, 3>())(1,2,3,4,5) == 3);
    FIT_TEST_CHECK( fit::arg(std::integral_constant<int, 3>())(1,2,3,4,5) == 3 );
}

FIT_TEST_CASE()
{
    auto at_3 = fit::arg(std::integral_constant<int, 3>());
    static_assert(fit::is_callable<decltype(at_3), int, int, int>::value, "Not SFINAE-friendly");
    static_assert(!fit::is_callable<decltype(at_3), int, int>::value, "Not SFINAE-friendly");
    static_assert(!fit::is_callable<decltype(at_3), int>::value, "Not SFINAE-friendly");
}

struct foo {};

FIT_TEST_CASE()
{
    static_assert(!fit::is_callable<decltype(fit::arg), int>::value, "Not sfinae friendly");
    static_assert(!fit::is_callable<decltype(fit::arg), foo>::value, "Not sfinae friendly");
}

struct copy_throws 
{
    copy_throws() {}
    copy_throws(copy_throws const&) {}
    copy_throws(copy_throws&&) noexcept {}
};
#if FIT_HAS_NOEXCEPT_DEDUCTION
FIT_TEST_CASE()
{
    static_assert(noexcept(fit::arg_c<3>(1,2,3,4,5)), "noexcept arg");
    static_assert(noexcept(fit::arg(std::integral_constant<int, 3>())(1,2,3,4,5)), "noexcept arg");
    static_assert(!noexcept(fit::arg(std::integral_constant<int, 3>())(1,2,copy_throws{},4,5)), "noexcept arg");
}
#endif