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/*
@copyright Louis Dionne 2014
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#include <boost/hana/functional.hpp>
#include <boost/hana/assert.hpp>
#include <boost/hana/detail/constexpr.hpp>
#include <test/injection.hpp>
#include <utility>
using namespace boost::hana;
template <int i>
struct _nonpod { virtual ~_nonpod() { } };
template <int i = 0>
_nonpod<i> nonpod{};
template <int i>
struct _undefined { };
template <int i = 0>
constexpr _undefined<i> undefined{};
struct move_only {
move_only(move_only&&) = default;
move_only(move_only const&) = delete;
};
int main() {
BOOST_HANA_CONSTEXPR_LAMBDA auto f = test::injection([]{});
BOOST_HANA_CONSTEXPR_LAMBDA auto g = test::injection([]{});
BOOST_HANA_CONSTEXPR_LAMBDA auto h = test::injection([]{});
BOOST_HANA_CONSTEXPR_LAMBDA auto i = test::injection([]{});
using test::x;
// always
{
auto z = x<0>;
BOOST_HANA_CONSTANT_CHECK(equal(
always(z)(), z
));
BOOST_HANA_CONSTANT_CHECK(equal(
always(z)(undefined<1>), z
));
BOOST_HANA_CONSTANT_CHECK(equal(
always(z)(undefined<1>, undefined<2>), z
));
BOOST_HANA_CONSTANT_CHECK(equal(
always(z)(undefined<1>, undefined<2>, undefined<3>), z
));
BOOST_HANA_CONSTANT_CHECK(equal(
always(z)(undefined<1>, undefined<2>, undefined<3>, undefined<4>), z
));
always(z)(nonpod<>);
auto m = always(move_only{})(undefined<1>); (void)m;
}
// apply
{
BOOST_HANA_CONSTANT_CHECK(equal(apply(f), f()));
BOOST_HANA_CONSTANT_CHECK(equal(apply(f, x<0>), f(x<0>)));
BOOST_HANA_CONSTANT_CHECK(equal(apply(f, x<0>, x<1>), f(x<0>, x<1>)));
BOOST_HANA_CONSTANT_CHECK(equal(apply(f, x<0>, x<1>, x<2>), f(x<0>, x<1>, x<2>)));
BOOST_HANA_CONSTANT_CHECK(equal(apply(f, x<0>, x<1>, x<2>, x<3>), f(x<0>, x<1>, x<2>, x<3>)));
apply(f, nonpod<>);
}
// arg
{
BOOST_HANA_CONSTANT_CHECK(equal(
arg<1>(x<1>),
x<1>
));
BOOST_HANA_CONSTANT_CHECK(equal(
arg<1>(x<1>, undefined<2>),
x<1>
));
BOOST_HANA_CONSTANT_CHECK(equal(
arg<1>(x<1>, undefined<2>, undefined<3>),
x<1>
));
arg<1>(nonpod<1>);
arg<1>(nonpod<1>, nonpod<2>);
BOOST_HANA_CONSTANT_CHECK(equal(
arg<2>(undefined<1>, x<2>),
x<2>
));
BOOST_HANA_CONSTANT_CHECK(equal(
arg<2>(undefined<1>, x<2>, undefined<3>),
x<2>
));
arg<2>(nonpod<1>, nonpod<2>);
arg<2>(nonpod<1>, nonpod<2>, nonpod<3>);
BOOST_HANA_CONSTANT_CHECK(equal(
arg<3>(undefined<1>, undefined<2>, x<3>),
x<3>
));
BOOST_HANA_CONSTANT_CHECK(equal(
arg<3>(undefined<1>, undefined<2>, x<3>, undefined<4>),
x<3>
));
arg<3>(nonpod<1>, nonpod<2>, nonpod<3>);
arg<3>(nonpod<1>, nonpod<2>, nonpod<3>, nonpod<4>);
}
// compose
{
BOOST_HANA_CONSTANT_CHECK(equal(
compose(f, g)(x<0>),
f(g(x<0>))
));
BOOST_HANA_CONSTANT_CHECK(equal(
compose(f, g)(x<0>, x<1>),
f(g(x<0>), x<1>)
));
BOOST_HANA_CONSTANT_CHECK(equal(
compose(f, g)(x<0>, x<1>, x<2>),
f(g(x<0>), x<1>, x<2>)
));
BOOST_HANA_CONSTANT_CHECK(equal(
compose(f, g, h)(x<0>),
f(g(h(x<0>)))
));
BOOST_HANA_CONSTANT_CHECK(equal(
compose(f, g, h)(x<0>, x<1>),
f(g(h(x<0>)), x<1>)
));
BOOST_HANA_CONSTANT_CHECK(equal(
compose(f, g, h)(x<0>, x<1>, x<2>),
f(g(h(x<0>)), x<1>, x<2>)
));
auto h = [capture = move_only{}](int dummy) { return 1; };
auto i = [](int dummy) { return 1; };
compose(std::move(h), i)(1);
{
// Compose move-only functions.
auto f = [capture = move_only{}] (int) { return 1; };
auto g = [capture = move_only{}] (int) { return 1; };
auto c = compose(std::move(f), std::move(g)); (void)c;
}
}
// curry
{
BOOST_HANA_CONSTANT_CHECK(equal(curry<0>(f)(), f()));
BOOST_HANA_CONSTANT_CHECK(equal(curry<1>(f)(x<1>), f(x<1>)));
BOOST_HANA_CONSTANT_CHECK(equal(curry<2>(f)(x<1>)(x<2>), f(x<1>, x<2>)));
BOOST_HANA_CONSTANT_CHECK(equal(curry<2>(f)(x<1>, x<2>), f(x<1>, x<2>)));
BOOST_HANA_CONSTANT_CHECK(equal(curry<3>(f)(x<1>)(x<2>)(x<3>), f(x<1>, x<2>, x<3>)));
BOOST_HANA_CONSTANT_CHECK(equal(curry<3>(f)(x<1>)(x<2>, x<3>), f(x<1>, x<2>, x<3>)));
BOOST_HANA_CONSTANT_CHECK(equal(curry<3>(f)(x<1>, x<2>)(x<3>), f(x<1>, x<2>, x<3>)));
BOOST_HANA_CONSTANT_CHECK(equal(curry<3>(f)(x<1>, x<2>, x<3>), f(x<1>, x<2>, x<3>)));
// Make sure curry is idempotent; this is important because it allows
// currying a function in generic contexts where it is unknown whether
// the function is already curried.
BOOST_HANA_CONSTANT_CHECK(equal(curry<0>(curry<0>(f))(), f()));
BOOST_HANA_CONSTANT_CHECK(equal(curry<1>(curry<1>(f))(x<1>), f(x<1>)));
BOOST_HANA_CONSTANT_CHECK(equal(curry<2>(curry<2>(f))(x<1>)(x<2>), f(x<1>, x<2>)));
BOOST_HANA_CONSTANT_CHECK(equal(curry<2>(curry<2>(f))(x<1>, x<2>), f(x<1>, x<2>)));
BOOST_HANA_CONSTANT_CHECK(equal(curry<3>(curry<3>(f))(x<1>)(x<2>)(x<3>), f(x<1>, x<2>, x<3>)));
BOOST_HANA_CONSTANT_CHECK(equal(curry<3>(curry<3>(f))(x<1>)(x<2>, x<3>), f(x<1>, x<2>, x<3>)));
BOOST_HANA_CONSTANT_CHECK(equal(curry<3>(curry<3>(f))(x<1>, x<2>)(x<3>), f(x<1>, x<2>, x<3>)));
BOOST_HANA_CONSTANT_CHECK(equal(curry<3>(curry<3>(f))(x<1>, x<2>, x<3>), f(x<1>, x<2>, x<3>)));
}
// demux
{
BOOST_HANA_CONSTANT_CHECK(equal(demux(f)()(), f()));
BOOST_HANA_CONSTANT_CHECK(equal(demux(f)(g)(x<1>), f(g(x<1>))));
BOOST_HANA_CONSTANT_CHECK(equal(demux(f)(g)(x<1>, x<2>), f(g(x<1>, x<2>))));
BOOST_HANA_CONSTANT_CHECK(equal(demux(f)(g)(x<1>, x<2>, x<3>), f(g(x<1>, x<2>, x<3>))));
BOOST_HANA_CONSTANT_CHECK(equal(demux(f)(g, h)(x<1>), f(g(x<1>), h(x<1>))));
BOOST_HANA_CONSTANT_CHECK(equal(demux(f)(g, h)(x<1>, x<2>), f(g(x<1>, x<2>), h(x<1>, x<2>))));
BOOST_HANA_CONSTANT_CHECK(equal(demux(f)(g, h)(x<1>, x<2>, x<3>), f(g(x<1>, x<2>, x<3>), h(x<1>, x<2>, x<3>))));
}
// fix (tested separately)
{
}
// flip
{
BOOST_HANA_CONSTANT_CHECK(equal(flip(f)(x<1>, x<2>), f(x<2>, x<1>)));
BOOST_HANA_CONSTANT_CHECK(equal(flip(f)(x<1>, x<2>, x<3>), f(x<2>, x<1>, x<3>)));
BOOST_HANA_CONSTANT_CHECK(equal(flip(f)(x<1>, x<2>, x<3>, x<4>), f(x<2>, x<1>, x<3>, x<4>)));
BOOST_HANA_CONSTANT_CHECK(equal(flip(f)(x<1>, x<2>, x<3>, x<4>, x<5>), f(x<2>, x<1>, x<3>, x<4>, x<5>)));
}
// id
{
BOOST_HANA_CONSTANT_CHECK(equal(id(x<0>), x<0>));
BOOST_HANA_CONSTANT_CHECK(equal(id(x<1>), x<1>));
(void)id(move_only{});
}
// lockstep
{
BOOST_HANA_CONSTANT_CHECK(equal(lockstep(f)()(), f()));
BOOST_HANA_CONSTANT_CHECK(equal(lockstep(f)(g)(x<1>), f(g(x<1>))));
BOOST_HANA_CONSTANT_CHECK(equal(lockstep(f)(g, h)(x<1>, x<2>), f(g(x<1>), h(x<2>))));
BOOST_HANA_CONSTANT_CHECK(equal(lockstep(f)(g, h, i)(x<1>, x<2>, x<3>), f(g(x<1>), h(x<2>), i(x<3>))));
}
// infix
{
BOOST_HANA_CONSTEXPR_LAMBDA auto g = infix(f);
// disregard associativity
BOOST_HANA_CONSTANT_CHECK(equal(x<0> ^g^ x<1>, f(x<0>, x<1>)));
BOOST_HANA_CONSTANT_CHECK(equal((x<0> ^g)^ x<1>, f(x<0>, x<1>)));
BOOST_HANA_CONSTANT_CHECK(equal(x<0> ^(g^ x<1>), f(x<0>, x<1>)));
// left partial application
BOOST_HANA_CONSTANT_CHECK(equal((x<0>^g)(x<1>), f(x<0>, x<1>)));
BOOST_HANA_CONSTANT_CHECK(equal((x<0>^g)(x<1>, x<2>), f(x<0>, x<1>, x<2>)));
BOOST_HANA_CONSTANT_CHECK(equal((x<0>^g)(x<1>, x<2>, x<3>), f(x<0>, x<1>, x<2>, x<3>)));
// right partial application
BOOST_HANA_CONSTANT_CHECK(equal((g^x<1>)(x<0>), f(x<0>, x<1>)));
BOOST_HANA_CONSTANT_CHECK(equal((g^x<2>)(x<0>, x<1>), f(x<0>, x<1>, x<2>)));
BOOST_HANA_CONSTANT_CHECK(equal((g^x<3>)(x<0>, x<1>, x<2>), f(x<0>, x<1>, x<2>, x<3>)));
// equivalence with the base function
BOOST_HANA_CONSTANT_CHECK(equal(g(x<0>, x<1>), f(x<0>, x<1>)));
BOOST_HANA_CONSTANT_CHECK(equal(g(x<0>, x<1>, x<2>), f(x<0>, x<1>, x<2>)));
BOOST_HANA_CONSTANT_CHECK(equal(g(x<0>, x<1>, x<2>, x<3>), f(x<0>, x<1>, x<2>, x<3>)));
}
// on
{
BOOST_HANA_CONSTANT_CHECK(equal(on(f, g)(), f()));
BOOST_HANA_CONSTANT_CHECK(equal(on(f, g)(x<0>), f(g(x<0>))));
BOOST_HANA_CONSTANT_CHECK(equal(on(f, g)(x<0>, x<1>), f(g(x<0>), g(x<1>))));
BOOST_HANA_CONSTANT_CHECK(equal(on(f, g)(x<0>, x<1>, x<2>), f(g(x<0>), g(x<1>), g(x<2>))));
BOOST_HANA_CONSTANT_CHECK(equal(on(f, g)(x<0>, x<1>, x<2>, x<3>), f(g(x<0>), g(x<1>), g(x<2>), g(x<3>))));
// check the infix version
BOOST_HANA_CONSTANT_CHECK(equal((f ^on^ g)(), f()));
BOOST_HANA_CONSTANT_CHECK(equal((f ^on^ g)(x<0>), f(g(x<0>))));
BOOST_HANA_CONSTANT_CHECK(equal((f ^on^ g)(x<0>, x<1>), f(g(x<0>), g(x<1>))));
BOOST_HANA_CONSTANT_CHECK(equal((f ^on^ g)(x<0>, x<1>, x<2>), f(g(x<0>), g(x<1>), g(x<2>))));
BOOST_HANA_CONSTANT_CHECK(equal((f ^on^ g)(x<0>, x<1>, x<2>, x<3>), f(g(x<0>), g(x<1>), g(x<2>), g(x<3>))));
}
// overload
{
// 1 function
{
auto f = overload([](int) { return x<1>; });
BOOST_HANA_CONSTANT_CHECK(equal(f(int{}), x<1>));
}
// 2 functions
{
auto f = overload(
[](int) { return x<1>; },
[](float) { return x<2>; }
);
BOOST_HANA_CONSTANT_CHECK(equal(f(int{}), x<1>));
BOOST_HANA_CONSTANT_CHECK(equal(f(float{}), x<2>));
}
// 3 functions
{
auto f = overload(
[](int) { return x<1>; },
[](float) { return x<2>; },
static_cast<decltype(x<3>)(*)(char)>([](char) { return x<3>; })
);
BOOST_HANA_CONSTANT_CHECK(equal(f(int{}), x<1>));
BOOST_HANA_CONSTANT_CHECK(equal(f(float{}), x<2>));
BOOST_HANA_CONSTANT_CHECK(equal(f(char{}), x<3>));
}
// 4 functions
{
auto f = overload(
[](int) { return x<1>; },
[](float) { return x<2>; },
static_cast<decltype(x<3>)(*)(char)>([](char) { return x<3>; }),
[](auto) { return x<4>; }
);
struct otherwise { };
BOOST_HANA_CONSTANT_CHECK(equal(f(int{}), x<1>));
BOOST_HANA_CONSTANT_CHECK(equal(f(float{}), x<2>));
BOOST_HANA_CONSTANT_CHECK(equal(f(char{}), x<3>));
BOOST_HANA_CONSTANT_CHECK(equal(f(otherwise{}), x<4>));
}
// check move-only friendlyness for bare functions
{
void (*g)(move_only) = [](move_only) { };
overload(g)(move_only{});
}
// check non-strict matches which require a conversion
{
struct convertible_to_int { operator int() const { return 1; } };
auto f = [](int) { return x<0>; };
BOOST_HANA_CONSTANT_CHECK(equal(
overload(f)(convertible_to_int{}),
x<0>
));
BOOST_HANA_CONSTANT_CHECK(equal(
overload(static_cast<decltype(x<0>)(*)(int)>(f))(convertible_to_int{}),
x<0>
));
}
}
// partial
{
BOOST_HANA_CONSTANT_CHECK(equal(partial(f)(), f()));
BOOST_HANA_CONSTANT_CHECK(equal(partial(f)(x<1>), f(x<1>)));
BOOST_HANA_CONSTANT_CHECK(equal(partial(f)(x<1>, x<2>), f(x<1>, x<2>)));
BOOST_HANA_CONSTANT_CHECK(equal(partial(f)(x<1>, x<2>, x<3>), f(x<1>, x<2>, x<3>)));
BOOST_HANA_CONSTANT_CHECK(equal(partial(f, x<1>)(), f(x<1>)));
BOOST_HANA_CONSTANT_CHECK(equal(partial(f, x<1>)(x<2>), f(x<1>, x<2>)));
BOOST_HANA_CONSTANT_CHECK(equal(partial(f, x<1>)(x<2>, x<3>), f(x<1>, x<2>, x<3>)));
BOOST_HANA_CONSTANT_CHECK(equal(partial(f, x<1>, x<2>)(), f(x<1>, x<2>)));
BOOST_HANA_CONSTANT_CHECK(equal(partial(f, x<1>, x<2>)(x<3>), f(x<1>, x<2>, x<3>)));
BOOST_HANA_CONSTANT_CHECK(equal(partial(f, x<1>, x<2>)(x<3>, x<4>), f(x<1>, x<2>, x<3>, x<4>)));
BOOST_HANA_CONSTANT_CHECK(equal(partial(f, x<1>, x<2>, x<3>)(), f(x<1>, x<2>, x<3>)));
}
// placeholder (tested separately)
{
}
}
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