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Make sure core metafunctions return IntegralConstants #310

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7 changes: 3 additions & 4 deletions include/boost/hana/core/common.hpp
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Expand Up @@ -16,11 +16,10 @@ Distributed under the Boost Software License, Version 1.0.
#include <boost/hana/config.hpp>
#include <boost/hana/core/when.hpp>
#include <boost/hana/detail/canonical_constant.hpp>
#include <boost/hana/detail/integral_constant.hpp>
#include <boost/hana/detail/std_common_type.hpp>
#include <boost/hana/detail/void_t.hpp>

#include <type_traits>


BOOST_HANA_NAMESPACE_BEGIN
//////////////////////////////////////////////////////////////////////////
Expand All @@ -45,11 +44,11 @@ BOOST_HANA_NAMESPACE_BEGIN
// has_common
//////////////////////////////////////////////////////////////////////////
template <typename T, typename U, typename>
struct has_common : std::false_type { };
struct has_common : hana::integral_constant<bool, false> { };

template <typename T, typename U>
struct has_common<T, U, detail::void_t<typename common<T, U>::type>>
: std::true_type
: hana::integral_constant<bool, true>
{ };

//////////////////////////////////////////////////////////////////////////
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7 changes: 3 additions & 4 deletions include/boost/hana/core/default.hpp
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Expand Up @@ -13,19 +13,18 @@ Distributed under the Boost Software License, Version 1.0.
#include <boost/hana/fwd/core/default.hpp>

#include <boost/hana/config.hpp>

#include <type_traits>
#include <boost/hana/detail/integral_constant.hpp>


BOOST_HANA_NAMESPACE_BEGIN
template <typename Method, typename>
struct is_default : std::false_type { };
struct is_default : hana::integral_constant<bool, false> { };

template <typename Method>
struct is_default<Method, decltype((void)
static_cast<default_>(*(Method*)0)
)>
: std::true_type
: hana::integral_constant<bool, true>
{ };
BOOST_HANA_NAMESPACE_END

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9 changes: 5 additions & 4 deletions include/boost/hana/core/to.hpp
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Expand Up @@ -19,6 +19,7 @@ Distributed under the Boost Software License, Version 1.0.
#include <boost/hana/core/common.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/core/make.hpp>
#include <boost/hana/detail/integral_constant.hpp>
#include <boost/hana/detail/wrong.hpp>
#include <boost/hana/unpack.hpp>
#include <boost/hana/value.hpp>
Expand Down Expand Up @@ -146,23 +147,23 @@ BOOST_HANA_NAMESPACE_BEGIN
// is_convertible
//////////////////////////////////////////////////////////////////////////
template <typename From, typename To, typename>
struct is_convertible : std::true_type { };
struct is_convertible : hana::integral_constant<bool, true> { };

template <typename From, typename To>
struct is_convertible<From, To, decltype((void)
static_cast<convert_detail::no_conversion>(*(to_impl<To, From>*)0)
)> : std::false_type { };
)> : hana::integral_constant<bool, false> { };

//////////////////////////////////////////////////////////////////////////
// is_embedded
//////////////////////////////////////////////////////////////////////////
template <typename From, typename To, typename>
struct is_embedded : std::false_type { };
struct is_embedded : hana::integral_constant<bool, false> { };

template <typename From, typename To>
struct is_embedded<From, To, decltype((void)
static_cast<embedding<true>>(*(to_impl<To, From>*)0)
)> : std::true_type { };
)> : hana::integral_constant<bool, true> { };

//////////////////////////////////////////////////////////////////////////
// Conversion for Constants
Expand Down
4 changes: 4 additions & 0 deletions test/core/common.cpp
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Expand Up @@ -2,7 +2,9 @@
// 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/concept/integral_constant.hpp>
#include <boost/hana/core/common.hpp>
#include <boost/hana/not.hpp>

#include <type_traits>
namespace hana = boost::hana;
Expand All @@ -29,4 +31,6 @@ static_assert(!hana::has_common<T, void>{}, "");
static_assert(!hana::has_common<invalid, T>{}, "");
static_assert(!hana::has_common<T, invalid>{}, "");

static_assert(hana::IntegralConstant<hana::has_common<T, T>>{}, "");

int main() { }
4 changes: 4 additions & 0 deletions test/core/default.cpp
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Expand Up @@ -3,6 +3,8 @@
// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)

#include <boost/hana/core/default.hpp>

#include <boost/hana/concept/integral_constant.hpp>
namespace hana = boost::hana;


Expand All @@ -15,4 +17,6 @@ struct method_impl<int> { };
static_assert(hana::is_default<method_impl<void>>{}, "");
static_assert(!hana::is_default<method_impl<int>>{}, "");

static_assert(hana::IntegralConstant<hana::is_default<method_impl<void>>>{}, "");

int main() { }
3 changes: 3 additions & 0 deletions test/core/is_embedded.cpp
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Expand Up @@ -2,13 +2,16 @@
// 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/concept/integral_constant.hpp>
#include <boost/hana/core/to.hpp>
#include <boost/hana/equal.hpp>

#include <climits>
namespace hana = boost::hana;


static_assert(hana::IntegralConstant<hana::is_embedded<float, double>>{}, "");

// This test makes sure that fundamental types are properly embedded in
// each other, when sensible.

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3 changes: 3 additions & 0 deletions test/core/to.cpp
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Expand Up @@ -5,6 +5,7 @@
#include <boost/hana/core/to.hpp>

#include <boost/hana/assert.hpp>
#include <boost/hana/concept/integral_constant.hpp>
#include <boost/hana/core/tag_of.hpp>

#include <string>
Expand Down Expand Up @@ -103,4 +104,6 @@ int main() {

static_assert(hana::is_convertible<int, void>{}, "");
static_assert(!hana::is_embedded<int, void>{}, "");

static_assert(hana::IntegralConstant<hana::is_convertible<int, void>>{}, "");
}