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functional.cpp
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// Copyright Louis Dionne 2013-2017
// 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/assert.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/functional.hpp>
#include <laws/base.hpp>
#include <support/tracked.hpp>
#include <utility>
namespace hana = boost::hana;
template <int i = 0>
struct nonpod : Tracked {
nonpod() : Tracked{i} { }
};
template <int i = 0>
struct undefined { };
struct move_only {
move_only(move_only&&) = default;
move_only(move_only const&) = delete;
};
int main() {
hana::test::_injection<0> f{};
hana::test::_injection<1> g{};
hana::test::_injection<2> h{};
using hana::test::ct_eq;
// always
{
auto z = ct_eq<0>{};
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::always(z)(), z
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::always(z)(undefined<1>{}), z
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::always(z)(undefined<1>{}, undefined<2>{}), z
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::always(z)(undefined<1>{}, undefined<2>{}, undefined<3>{}), z
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::always(z)(undefined<1>{}, undefined<2>{}, undefined<3>{}, undefined<4>{}), z
));
hana::always(z)(nonpod<>{});
auto m = hana::always(move_only{})(undefined<1>{}); (void)m;
}
// apply (tested separately)
{
}
// arg
{
// moveonly friendliness:
move_only z = hana::arg<1>(move_only{}); (void)z;
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::arg<1>(ct_eq<1>{}),
ct_eq<1>{}
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::arg<1>(ct_eq<1>{}, undefined<2>{}),
ct_eq<1>{}
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::arg<1>(ct_eq<1>{}, undefined<2>{}, undefined<3>{}),
ct_eq<1>{}
));
hana::arg<1>(nonpod<1>{});
hana::arg<1>(nonpod<1>{}, nonpod<2>{});
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::arg<2>(undefined<1>{}, ct_eq<2>{}),
ct_eq<2>{}
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::arg<2>(undefined<1>{}, ct_eq<2>{}, undefined<3>{}),
ct_eq<2>{}
));
hana::arg<2>(nonpod<1>{}, nonpod<2>{});
hana::arg<2>(nonpod<1>{}, nonpod<2>{}, nonpod<3>{});
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::arg<3>(undefined<1>{}, undefined<2>{}, ct_eq<3>{}),
ct_eq<3>{}
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::arg<3>(undefined<1>{}, undefined<2>{}, ct_eq<3>{}, undefined<4>{}),
ct_eq<3>{}
));
hana::arg<3>(nonpod<1>{}, nonpod<2>{}, nonpod<3>{});
hana::arg<3>(nonpod<1>{}, nonpod<2>{}, nonpod<3>{}, nonpod<4>{});
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::arg<4>(undefined<1>{}, undefined<2>{}, undefined<3>{}, ct_eq<4>{}),
ct_eq<4>{}
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::arg<4>(undefined<1>{}, undefined<2>{}, undefined<3>{}, ct_eq<4>{}, undefined<5>{}),
ct_eq<4>{}
));
hana::arg<4>(nonpod<1>{}, nonpod<2>{}, nonpod<3>{}, nonpod<4>{});
hana::arg<4>(nonpod<1>{}, nonpod<2>{}, nonpod<3>{}, nonpod<4>{}, nonpod<5>{});
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::arg<5>(undefined<1>{}, undefined<2>{}, undefined<3>{}, undefined<4>{}, ct_eq<5>{}),
ct_eq<5>{}
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::arg<5>(undefined<1>{}, undefined<2>{}, undefined<3>{}, undefined<4>{}, ct_eq<5>{}, undefined<6>{}),
ct_eq<5>{}
));
hana::arg<5>(nonpod<1>{}, nonpod<2>{}, nonpod<3>{}, nonpod<4>{}, nonpod<5>{});
hana::arg<5>(nonpod<1>{}, nonpod<2>{}, nonpod<3>{}, nonpod<4>{}, nonpod<5>{}, nonpod<6>{});
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::arg<6>(undefined<1>{}, undefined<2>{}, undefined<3>{}, undefined<4>{}, undefined<5>{}, ct_eq<6>{}),
ct_eq<6>{}
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::arg<6>(undefined<1>{}, undefined<2>{}, undefined<3>{}, undefined<4>{}, undefined<5>{}, ct_eq<6>{}, undefined<7>{}),
ct_eq<6>{}
));
hana::arg<6>(nonpod<1>{}, nonpod<2>{}, nonpod<3>{}, nonpod<4>{}, nonpod<5>{}, nonpod<6>{});
hana::arg<6>(nonpod<1>{}, nonpod<2>{}, nonpod<3>{}, nonpod<4>{}, nonpod<5>{}, nonpod<6>{}, nonpod<7>{});
}
// compose
{
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::compose(f, g)(ct_eq<0>{}),
f(g(ct_eq<0>{}))
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::compose(f, g)(ct_eq<0>{}, ct_eq<1>{}),
f(g(ct_eq<0>{}), ct_eq<1>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::compose(f, g)(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}),
f(g(ct_eq<0>{}), ct_eq<1>{}, ct_eq<2>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::compose(f, g, h)(ct_eq<0>{}),
f(g(h(ct_eq<0>{})))
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::compose(f, g, h)(ct_eq<0>{}, ct_eq<1>{}),
f(g(h(ct_eq<0>{})), ct_eq<1>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::compose(f, g, h)(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}),
f(g(h(ct_eq<0>{})), ct_eq<1>{}, ct_eq<2>{})
));
auto h = [capture = move_only{}](int) { (void)capture; return 1; };
auto i = [](int) { return 1; };
hana::compose(std::move(h), i)(1);
{
// Compose move-only functions.
auto f = [capture = move_only{}](int) { (void)capture; return 1; };
auto g = [capture = move_only{}](int) { (void)capture; return 1; };
auto c = hana::compose(std::move(f), std::move(g)); (void)c;
}
}
// curry
{
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<0>(f)(),
f()
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<1>(f)(ct_eq<1>{}),
f(ct_eq<1>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<2>(f)(ct_eq<1>{})(ct_eq<2>{}),
f(ct_eq<1>{}, ct_eq<2>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<2>(f)(ct_eq<1>{}, ct_eq<2>{}),
f(ct_eq<1>{}, ct_eq<2>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<3>(f)(ct_eq<1>{})(ct_eq<2>{})(ct_eq<3>{}),
f(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<3>(f)(ct_eq<1>{})(ct_eq<2>{}, ct_eq<3>{}),
f(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<3>(f)(ct_eq<1>{}, ct_eq<2>{})(ct_eq<3>{}),
f(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<3>(f)(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}),
f(ct_eq<1>{}, ct_eq<2>{}, ct_eq<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(hana::equal(
hana::curry<0>(hana::curry<0>(f))(),
f()
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<1>(hana::curry<1>(f))(ct_eq<1>{}),
f(ct_eq<1>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<2>(hana::curry<2>(f))(ct_eq<1>{})(ct_eq<2>{}),
f(ct_eq<1>{}, ct_eq<2>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<2>(hana::curry<2>(f))(ct_eq<1>{}, ct_eq<2>{}),
f(ct_eq<1>{}, ct_eq<2>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<3>(hana::curry<3>(f))(ct_eq<1>{})(ct_eq<2>{})(ct_eq<3>{}),
f(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<3>(hana::curry<3>(f))(ct_eq<1>{})(ct_eq<2>{}, ct_eq<3>{}),
f(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<3>(hana::curry<3>(f))(ct_eq<1>{}, ct_eq<2>{})(ct_eq<3>{}),
f(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::curry<3>(hana::curry<3>(f))(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}),
f(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{})
));
}
// demux (tested separately)
{
}
// fix (tested separately)
{
}
// flip
{
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::flip(f)(ct_eq<1>{}, ct_eq<2>{}),
f(ct_eq<2>{}, ct_eq<1>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::flip(f)(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}),
f(ct_eq<2>{}, ct_eq<1>{}, ct_eq<3>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::flip(f)(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}, ct_eq<4>{}),
f(ct_eq<2>{}, ct_eq<1>{}, ct_eq<3>{}, ct_eq<4>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::flip(f)(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}, ct_eq<4>{}, ct_eq<5>{}),
f(ct_eq<2>{}, ct_eq<1>{}, ct_eq<3>{}, ct_eq<4>{}, ct_eq<5>{})
));
}
// id
{
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::id(ct_eq<0>{}),
ct_eq<0>{}
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::id(ct_eq<1>{}),
ct_eq<1>{}
));
(void)hana::id(move_only{});
// make sure we don't return a dangling reference
auto f = []() -> decltype(auto) { return hana::id(Tracked{1}); };
auto z = f(); (void)z;
}
// lockstep (tested separately)
{
}
// infix
{
auto g = hana::infix(f);
// disregard associativity
BOOST_HANA_CONSTANT_CHECK(hana::equal(
ct_eq<0>{} ^g^ ct_eq<1>{},
f(ct_eq<0>{}, ct_eq<1>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
(ct_eq<0>{} ^g)^ ct_eq<1>{},
f(ct_eq<0>{}, ct_eq<1>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
ct_eq<0>{} ^(g^ ct_eq<1>{}),
f(ct_eq<0>{}, ct_eq<1>{})
));
// left partial application
BOOST_HANA_CONSTANT_CHECK(hana::equal(
(ct_eq<0>{}^g)(ct_eq<1>{}),
f(ct_eq<0>{}, ct_eq<1>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
(ct_eq<0>{}^g)(ct_eq<1>{}, ct_eq<2>{}),
f(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
(ct_eq<0>{}^g)(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}),
f(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{})
));
// right partial application
BOOST_HANA_CONSTANT_CHECK(hana::equal(
(g^ct_eq<1>{})(ct_eq<0>{}),
f(ct_eq<0>{}, ct_eq<1>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
(g^ct_eq<2>{})(ct_eq<0>{}, ct_eq<1>{}),
f(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
(g^ct_eq<3>{})(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}),
f(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{})
));
// equivalence with the base function
BOOST_HANA_CONSTANT_CHECK(hana::equal(
g(ct_eq<0>{}, ct_eq<1>{}),
f(ct_eq<0>{}, ct_eq<1>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
g(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}),
f(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{})
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
g(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}),
f(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{})
));
}
// on
{
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::on(f, g)(),
f()
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::on(f, g)(ct_eq<0>{}),
f(g(ct_eq<0>{}))
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::on(f, g)(ct_eq<0>{}, ct_eq<1>{}),
f(g(ct_eq<0>{}), g(ct_eq<1>{}))
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::on(f, g)(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}),
f(g(ct_eq<0>{}), g(ct_eq<1>{}), g(ct_eq<2>{}))
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::on(f, g)(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}),
f(g(ct_eq<0>{}), g(ct_eq<1>{}), g(ct_eq<2>{}), g(ct_eq<3>{}))
));
// check the infix version
BOOST_HANA_CONSTANT_CHECK(hana::equal(
(f ^hana::on^ g)(),
f()
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
(f ^hana::on^ g)(ct_eq<0>{}),
f(g(ct_eq<0>{}))
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
(f ^hana::on^ g)(ct_eq<0>{}, ct_eq<1>{}),
f(g(ct_eq<0>{}), g(ct_eq<1>{}))
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
(f ^hana::on^ g)(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}),
f(g(ct_eq<0>{}), g(ct_eq<1>{}), g(ct_eq<2>{}))
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
(f ^hana::on^ g)(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}),
f(g(ct_eq<0>{}), g(ct_eq<1>{}), g(ct_eq<2>{}), g(ct_eq<3>{}))
));
}
// overload
{
// 1 function
{
auto f = hana::overload([](int) { return ct_eq<1>{}; });
BOOST_HANA_CONSTANT_CHECK(hana::equal(f(int{}), ct_eq<1>{}));
}
// 2 functions
{
auto f = hana::overload(
[](int) { return ct_eq<1>{}; },
[](float) { return ct_eq<2>{}; }
);
BOOST_HANA_CONSTANT_CHECK(hana::equal(f(int{}), ct_eq<1>{}));
BOOST_HANA_CONSTANT_CHECK(hana::equal(f(float{}), ct_eq<2>{}));
}
// 3 functions
{
auto f = hana::overload(
[](int) { return ct_eq<1>{}; },
[](float) { return ct_eq<2>{}; },
static_cast<ct_eq<3>(*)(char)>([](char) { return ct_eq<3>{}; })
);
BOOST_HANA_CONSTANT_CHECK(hana::equal(f(int{}), ct_eq<1>{}));
BOOST_HANA_CONSTANT_CHECK(hana::equal(f(float{}), ct_eq<2>{}));
BOOST_HANA_CONSTANT_CHECK(hana::equal(f(char{}), ct_eq<3>{}));
}
// 4 functions
{
auto f = hana::overload(
[](int) { return ct_eq<1>{}; },
[](float) { return ct_eq<2>{}; },
static_cast<ct_eq<3>(*)(char)>([](char) { return ct_eq<3>{}; }),
[](auto) { return ct_eq<4>{}; }
);
struct otherwise { };
BOOST_HANA_CONSTANT_CHECK(hana::equal(f(int{}), ct_eq<1>{}));
BOOST_HANA_CONSTANT_CHECK(hana::equal(f(float{}), ct_eq<2>{}));
BOOST_HANA_CONSTANT_CHECK(hana::equal(f(char{}), ct_eq<3>{}));
BOOST_HANA_CONSTANT_CHECK(hana::equal(f(otherwise{}), ct_eq<4>{}));
}
// check move-only friendliness for bare functions
{
void (*g)(move_only) = [](move_only) { };
hana::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 ct_eq<0>{}; };
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::overload(f)(convertible_to_int{}),
ct_eq<0>{}
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::overload(static_cast<ct_eq<0>(*)(int)>(f))(convertible_to_int{}),
ct_eq<0>{}
));
}
}
// partial (tested separately)
{
}
// placeholder (tested separately)
{
}
}