diff options
Diffstat (limited to '')
-rw-r--r-- | src/boost/libs/hana/test/type/integral.cpp | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/type/integral.cpp b/src/boost/libs/hana/test/type/integral.cpp new file mode 100644 index 000000000..e3159bbc3 --- /dev/null +++ b/src/boost/libs/hana/test/type/integral.cpp @@ -0,0 +1,83 @@ +// 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/concept/metafunction.hpp> +#include <boost/hana/equal.hpp> +#include <boost/hana/not.hpp> +#include <boost/hana/type.hpp> + +#include <type_traits> +namespace hana = boost::hana; + + +struct x1; struct x2; struct x3; +struct y1 { }; struct y2 { }; struct y3 { }; + +template <typename ...> struct mf { struct type { }; }; +struct mfc { template <typename ...> struct apply { struct type { }; }; }; +template <typename ...> struct tpl { }; + +// make sure `integral(f)(...)` returns the right type +static_assert(std::is_same< + decltype(hana::integral(hana::metafunction<mf>)()), + mf<>::type +>{}, ""); +static_assert(std::is_same< + decltype(hana::integral(hana::metafunction<mf>)(hana::type_c<x1>)), + mf<x1>::type +>{}, ""); +static_assert(std::is_same< + decltype(hana::integral(hana::metafunction<mf>)(hana::type_c<x1>, hana::type_c<x2>)), + mf<x1, x2>::type +>{}, ""); + +static_assert(std::is_same< + decltype(hana::integral(hana::template_<tpl>)()), + tpl<> +>{}, ""); +static_assert(std::is_same< + decltype(hana::integral(hana::template_<tpl>)(hana::type_c<x1>)), + tpl<x1> +>{}, ""); +static_assert(std::is_same< + decltype(hana::integral(hana::template_<tpl>)(hana::type_c<x1>, hana::type_c<x2>)), + tpl<x1, x2> +>{}, ""); + +static_assert(std::is_same< + decltype(hana::integral(hana::metafunction_class<mfc>)()), + mfc::apply<>::type +>{}, ""); +static_assert(std::is_same< + decltype(hana::integral(hana::metafunction_class<mfc>)(hana::type_c<x1>)), + mfc::apply<x1>::type +>{}, ""); +static_assert(std::is_same< + decltype(hana::integral(hana::metafunction_class<mfc>)(hana::type_c<x1>, hana::type_c<x2>)), + mfc::apply<x1, x2>::type +>{}, ""); + +// Make sure integral is SFINAE-friendly +struct invalid_hana_metafunction { + template <typename ...> struct apply { /* missing type alias */ }; +}; +auto invalid_integral = hana::integral(invalid_hana_metafunction{}); +BOOST_HANA_CONSTANT_CHECK(hana::not_( + hana::is_valid(invalid_integral)(hana::type_c<void>, hana::type_c<void>) +)); + + +int main() { + // Make sure we can perform the call; we already made sure the return type was correct + constexpr auto a = hana::integral(hana::metafunction<mf>)(); (void)a; + constexpr auto b = hana::integral(hana::metafunction<mf>)(hana::type_c<x1>); (void)b; + constexpr auto c = hana::integral(hana::metafunction<mf>)(hana::type_c<x1>, hana::type_c<x2>); (void)c; + constexpr auto d = hana::integral(hana::metafunction<mf>)(hana::type_c<x1>, hana::type_c<x2>, hana::type_c<x3>); (void)d; + + // Make sure we don't read from a non-constexpr variable + auto t = hana::type_c<x1>; + constexpr auto r = hana::integral(hana::metafunction<mf>)(t); + (void)r; +} |