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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/bool.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/equal.hpp>
#include <boost/hana/hash.hpp>
#include <boost/hana/integral_constant.hpp>
#include <boost/hana/type.hpp>
#include <type_traits>
namespace hana = boost::hana;
int main() {
// Unsigned integral constants should hash to `unsigned long long`
{
BOOST_HANA_CONSTANT_ASSERT(hana::equal(
hana::hash(hana::integral_c<unsigned char, 10>),
hana::type_c<hana::integral_constant<unsigned long long, 10>>
));
BOOST_HANA_CONSTANT_ASSERT(hana::equal(
hana::hash(hana::integral_c<unsigned short, 10>),
hana::type_c<hana::integral_constant<unsigned long long, 10>>
));
BOOST_HANA_CONSTANT_ASSERT(hana::equal(
hana::hash(hana::integral_c<unsigned int, 10>),
hana::type_c<hana::integral_constant<unsigned long long, 10>>
));
BOOST_HANA_CONSTANT_ASSERT(hana::equal(
hana::hash(hana::integral_c<unsigned long, 10>),
hana::type_c<hana::integral_constant<unsigned long long, 10>>
));
BOOST_HANA_CONSTANT_ASSERT(hana::equal(
hana::hash(hana::integral_c<unsigned long long, 10>),
hana::type_c<hana::integral_constant<unsigned long long, 10>>
));
}
// Signed integral constants should hash to `signed long long`
{
BOOST_HANA_CONSTANT_ASSERT(hana::equal(
hana::hash(hana::integral_c<signed char, 10>),
hana::type_c<hana::integral_constant<signed long long, 10>>
));
BOOST_HANA_CONSTANT_ASSERT(hana::equal(
hana::hash(hana::integral_c<signed short, 10>),
hana::type_c<hana::integral_constant<signed long long, 10>>
));
BOOST_HANA_CONSTANT_ASSERT(hana::equal(
hana::hash(hana::integral_c<signed int, 10>),
hana::type_c<hana::integral_constant<signed long long, 10>>
));
BOOST_HANA_CONSTANT_ASSERT(hana::equal(
hana::hash(hana::integral_c<signed long, 10>),
hana::type_c<hana::integral_constant<signed long long, 10>>
));
BOOST_HANA_CONSTANT_ASSERT(hana::equal(
hana::hash(hana::integral_c<signed long long, 10>),
hana::type_c<hana::integral_constant<signed long long, 10>>
));
}
// `char` should hash to either `signed long long` or `unsigned long long`,
// depending on its signedness
{
using T = std::conditional_t<
std::is_signed<char>::value,
signed long long,
unsigned long long
>;
BOOST_HANA_CONSTANT_ASSERT(hana::equal(
hana::hash(hana::integral_c<char, 10>),
hana::type_c<hana::integral_constant<T, 10>>
));
}
// Pointers to members should hash to themselves.
// This test is disabled in pre-C++17, because pointers to non-static
// data members can't be used as non-type template arguments before that.
// See http://stackoverflow.com/q/35398848/627587.
{
#if __cplusplus > 201402L
struct Foo { int bar; };
constexpr auto x = hana::integral_constant<int Foo::*, &Foo::bar>{};
BOOST_HANA_CONSTANT_ASSERT(hana::equal(
hana::hash(x),
hana::type_c<hana::integral_constant<int Foo::*, &Foo::bar>>
));
#endif
}
// Booleans should hash to themselves
{
BOOST_HANA_CONSTANT_ASSERT(hana::equal(
hana::hash(hana::true_c),
hana::type_c<hana::true_>
));
BOOST_HANA_CONSTANT_ASSERT(hana::equal(
hana::hash(hana::false_c),
hana::type_c<hana::false_>
));
}
}
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