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// Copyright Louis Dionne 2013-2022
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
#ifndef BOOST_HANA_TEST_LAWS_BASE_HPP
#define BOOST_HANA_TEST_LAWS_BASE_HPP
#include <boost/hana/and.hpp>
#include <boost/hana/bool.hpp>
#include <boost/hana/core/when.hpp>
#include <boost/hana/detail/wrong.hpp>
#include <boost/hana/equal.hpp>
#include <boost/hana/eval_if.hpp>
#include <boost/hana/for_each.hpp>
#include <boost/hana/functional/compose.hpp>
#include <boost/hana/functional/infix.hpp>
#include <boost/hana/functional/partial.hpp>
#include <boost/hana/fwd/concept/integral_constant.hpp>
#include <boost/hana/fwd/core/to.hpp>
#include <boost/hana/fwd/less.hpp>
#include <boost/hana/not.hpp>
#include <boost/hana/or.hpp>
#include <boost/hana/tuple.hpp>
#include <support/tracked.hpp>
#include <type_traits>
#include <utility>
namespace boost { namespace hana {
//////////////////////////////////////////////////////////////////////////
// Misc
//////////////////////////////////////////////////////////////////////////
namespace test {
struct laws;
template <int i>
struct for_each_n_t {
static_assert(i > 0, "can't use for_each_n with i < 0");
template <typename Xs, typename F>
constexpr auto operator()(Xs const& xs, F const& f) const {
hana::for_each(xs,
hana::compose(
hana::partial(for_each_n_t<i - 1>{}, xs),
hana::partial(hana::partial, f)
)
);
}
};
template <>
struct for_each_n_t<1> {
template <typename Xs, typename F>
constexpr auto operator()(Xs const& xs, F const& f) const {
hana::for_each(xs, f);
}
};
template <int i>
constexpr for_each_n_t<i> for_each_n{};
auto foreach = hana::for_each;
constexpr auto foreach3 = for_each_n<3>;
constexpr auto foreach2 = for_each_n<2>;
struct implies_t {
template <typename P, typename Q>
constexpr decltype(auto) operator()(P&& p, Q&& q) const {
return hana::or_(hana::not_(static_cast<P&&>(p)),
static_cast<Q&&>(q));
}
};
constexpr auto implies = hana::infix(implies_t{});
struct iff_t {
template <typename P, typename Q>
constexpr decltype(auto) operator()(P&& p, Q&& q) const {
return hana::and_(implies(p, q), implies(q, p));
}
};
constexpr auto iff = hana::infix(iff_t{});
template <typename Cond, typename F>
constexpr decltype(auto) only_when_(Cond cond, F f) {
return hana::eval_if(cond, f, [](auto){ });
}
// A type with a constructor that must not be instantiated.
// This is to make sure we don't instantiate something else than
// the copy-constructor of the elements inside a container when we
// copy the container.
struct trap_construct {
trap_construct() = default;
trap_construct(trap_construct const&) = default;
#ifndef BOOST_HANA_WORKAROUND_MSVC_MULTIPLECTOR_106654
trap_construct(trap_construct&) = default;
#endif
trap_construct(trap_construct&&) = default;
template <typename X>
trap_construct(X&&) {
static_assert(detail::wrong<X>{},
"this constructor must not be instantiated");
}
};
// A move-only type. Useful for testing containers.
struct move_only {
move_only() = default;
move_only(move_only const&) = delete;
move_only(move_only&&) = default;
};
//////////////////////////////////////////////////////////////////////
// InjectionResult
//////////////////////////////////////////////////////////////////////
struct InjectionResult { };
template <int i, typename ...X>
struct injection_result {
using hana_tag = InjectionResult;
static constexpr int injection_id = i;
hana::tuple<X...> args;
Tracked tracker;
template <typename ...Y, typename = decltype(tuple<X...>{std::declval<Y>()...})>
constexpr explicit injection_result(Y&& ...y)
: args{static_cast<Y&&>(y)...}, tracker{i}
{ }
};
//! A monotonic injective function.
//!
//! This is used in the unit tests, where we often just need a function
//! which preserves equality and order, but which also satisfies the
//! following law for all `Injection`s `f` and `g`:
//! @code
//! f(x) == g(x) if and only if f === g
//! @endcode
//! where `===` means _was created by the same call to `injection`_.
//! This allows creating several such functions in the unit tests while
//! conserving precious information such as the fact that
//! `f(g(x)) != g(f(x))`.
template <int i>
struct _injection {
template <typename ...X>
constexpr auto operator()(X&& ...x) const {
return injection_result<i,
typename std::decay<X>::type...
>{static_cast<X&&>(x)...};
}
};
} // end namespace test
template <>
struct equal_impl<test::InjectionResult, test::InjectionResult> {
template <typename X, typename Y>
static constexpr auto apply(X x, Y y) {
return hana::and_(
hana::bool_c<X::injection_id == Y::injection_id>,
hana::equal(x.args, y.args)
);
}
};
template <>
struct less_impl<test::InjectionResult, test::InjectionResult> {
template <typename X, typename Y>
static constexpr auto apply(X x, Y y) {
static_assert(X::injection_id == Y::injection_id,
"can't order the result of two different injections");
return hana::less(x.args, y.args);
}
};
//////////////////////////////////////////////////////////////////////////
// Integer
//////////////////////////////////////////////////////////////////////////
namespace test {
enum class Policy : int {
// One of those is mandatory
Constant = 1 << 0
, Constexpr = 1 << 1
, Runtime = 1 << 2
// Those are optional
, Tracked = 1 << 3
, Comparable = 1 << 4
, Orderable = 1 << 5
};
constexpr bool operator&&(Policy a, Policy b) {
return static_cast<int>(a) && static_cast<int>(b);
}
constexpr bool operator&&(Policy a, bool b) {
return static_cast<int>(a) && b;
}
constexpr bool operator&&(bool a, Policy b) {
return a && static_cast<int>(b);
}
constexpr bool operator||(Policy a, Policy b) {
return static_cast<int>(a) || static_cast<int>(b);
}
constexpr bool operator||(Policy a, bool b) {
return static_cast<int>(a) || b;
}
constexpr bool operator||(bool a, Policy b) {
return a || static_cast<int>(b);
}
constexpr bool operator!(Policy a) {
return !static_cast<int>(a);
}
constexpr Policy operator|(Policy a, Policy b) {
return static_cast<Policy>(static_cast<int>(a) | static_cast<int>(b));
}
constexpr Policy operator&(Policy a, Policy b) {
return static_cast<Policy>(static_cast<int>(a) & static_cast<int>(b));
}
template <Policy policy, typename = void>
struct Integer { };
template <Policy policy>
struct Integer<policy, std::enable_if_t<!!(policy & Policy::Constant)>> {
using value_type = int;
};
template <int i, Policy policy, typename = void>
struct integer {
static_assert(
!!(policy & (Policy::Constant | Policy::Constexpr | Policy::Runtime))
, "You must choose at least one of Constant, Constexpr and Runtime.");
static constexpr int value = i;
constexpr operator int() const { return value; }
using hana_tag = Integer<policy>;
Tracked tracker{i};
};
template <int i, Policy policy>
struct integer <i, policy, std::enable_if_t<!!(policy & Policy::Constexpr)>> {
static constexpr int value = i;
constexpr operator int() const { return value; }
using hana_tag = Integer<policy>;
};
template <int i>
struct eq : integer<i, Policy::Comparable | Policy::Runtime> { };
template <int i>
struct ct_eq : integer<i, Policy::Comparable | Policy::Constant> { };
template <int i>
struct cx_eq : integer<i, Policy::Comparable | Policy::Constexpr> { };
template <int i>
struct ord : integer<i, Policy::Orderable | Policy::Runtime> { };
template <int i>
struct ct_ord : integer<i, Policy::Orderable | Policy::Constant> { };
template <int i>
struct cx_ord : integer<i, Policy::Orderable | Policy::Constexpr> { };
template <int i>
struct _constant
: integer<i, Policy::Constant | Policy::Comparable | Policy::Orderable>
{ };
}
//////////////////////////////////////////////////////////////////////////
// Model of Constant/IntegralConstant
//////////////////////////////////////////////////////////////////////////
template <test::Policy policy>
struct IntegralConstant<test::Integer<policy>> {
static constexpr bool value = static_cast<bool>(policy & test::Policy::Constant);
};
template <test::Policy policy, typename C>
struct to_impl<test::Integer<policy>, C, when<
(policy & test::Policy::Constant) &&
hana::IntegralConstant<C>::value
>>
: embedding<is_embedded<typename C::value_type, int>::value>
{
template <typename N>
static constexpr auto apply(N const&) {
return test::integer<N::value, policy>{};
}
};
//////////////////////////////////////////////////////////////////////////
// Model of Comparable
//////////////////////////////////////////////////////////////////////////
template <test::Policy p1, test::Policy p2>
struct equal_impl<test::Integer<p1>, test::Integer<p2>, when<
// both Comparable or Orderable
(p1 & (test::Policy::Comparable | test::Policy::Orderable)) &&
(p2 & (test::Policy::Comparable | test::Policy::Orderable)) &&
// one Constexpr and the other Constant, or both Constexpr
(((p1 & test::Policy::Constant) && (p2 & test::Policy::Constexpr)) ||
((p1 & test::Policy::Constexpr) && (p2 & test::Policy::Constant)) ||
((p1 & test::Policy::Constexpr) && (p2 & test::Policy::Constexpr)))
>> {
template <typename X, typename Y>
static constexpr bool apply(X const&, Y const&)
{ return X::value == Y::value; }
};
template <test::Policy p1, test::Policy p2>
struct equal_impl<test::Integer<p1>, test::Integer<p2>, when<
// both Comparable or Orderable
(p1 & (test::Policy::Comparable | test::Policy::Orderable)) &&
(p2 & (test::Policy::Comparable | test::Policy::Orderable)) &&
// either one is Runtime
((p1 & test::Policy::Runtime) || (p2 & test::Policy::Runtime))
>> {
template <typename X, typename Y>
static bool apply(X const&, Y const&)
{ return X::value == Y::value; }
};
//////////////////////////////////////////////////////////////////////////
// Model of Orderable
//////////////////////////////////////////////////////////////////////////
template <test::Policy p1, test::Policy p2>
struct less_impl<test::Integer<p1>, test::Integer<p2>, when<
// both Orderable
(p1 & test::Policy::Orderable) && (p2 & test::Policy::Orderable) &&
// one Constexpr and the other Constant, or both Constexpr
(((p1 & test::Policy::Constant) && (p2 & test::Policy::Constexpr)) ||
((p1 & test::Policy::Constexpr) && (p2 & test::Policy::Constant)) ||
((p1 & test::Policy::Constexpr) && (p2 & test::Policy::Constexpr)))
>> {
template <typename X, typename Y>
static constexpr bool apply(X const&, Y const&)
{ return X::value < Y::value; }
};
template <test::Policy p1, test::Policy p2>
struct less_impl<test::Integer<p1>, test::Integer<p2>, when<
// both Orderable
(p1 & test::Policy::Orderable) && (p2 & test::Policy::Orderable) &&
// either one is Runtime
((p1 & test::Policy::Runtime) || (p2 & test::Policy::Runtime))
>> {
template <typename X, typename Y>
static bool apply(X const&, Y const&)
{ return X::value < Y::value; }
};
}} // end namespace boost::hana
#endif // !BOOST_HANA_TEST_LAWS_BASE_HPP
|
