Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 321 insertions, 0 deletions

diff --git a/src/boost/libs/hana/example/misc/infinite_set.cpp b/src/boost/libs/hana/example/misc/infinite_set.cpp
new file mode 100644
index 000000000..6bccfd535
--- /dev/null
+++ b/src/boost/libs/hana/example/misc/infinite_set.cpp
@@ -0,0 +1,321 @@
+// 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/and.hpp>
+#include <boost/hana/any_of.hpp>
+#include <boost/hana/flatten.hpp>
+#include <boost/hana/functional/compose.hpp>
+#include <boost/hana/functional/partial.hpp>
+#include <boost/hana/fwd/ap.hpp>
+#include <boost/hana/fwd/equal.hpp>
+#include <boost/hana/fwd/find_if.hpp>
+#include <boost/hana/fwd/lift.hpp>
+#include <boost/hana/fwd/union.hpp>
+#include <boost/hana/if.hpp>
+#include <boost/hana/is_subset.hpp>
+#include <boost/hana/optional.hpp>
+#include <boost/hana/transform.hpp>
+namespace hana = boost::hana;
+
+
+// A `Monad` for searching infinite sets in finite time.
+//
+// Taken from http://goo.gl/XJeDy8.
+struct infinite_set_tag { };
+
+template <typename Find>
+struct infinite_set {
+    Find find;
+    using hana_tag = infinite_set_tag;
+};
+
+template <typename Pred>
+constexpr infinite_set<Pred> make_infinite_set(Pred pred) {
+    return {pred};
+}
+
+template <typename X>
+constexpr auto singleton(X x) {
+    return make_infinite_set([=](auto /*p*/) { return x; });
+}
+
+template <typename X, typename Y>
+constexpr auto doubleton(X x, Y y) {
+    return make_infinite_set([=](auto p) {
+        return hana::if_(p(x), x, y);
+    });
+}
+
+namespace boost { namespace hana {
+    template <>
+    struct union_impl<infinite_set_tag> {
+        template <typename Xs, typename Ys>
+        static constexpr auto apply(Xs xs, Ys ys) {
+            return flatten(doubleton(xs, ys));
+        }
+    };
+
+    //////////////////////////////////////////////////////////////////////////
+    // Comparable
+    //////////////////////////////////////////////////////////////////////////
+    template <>
+    struct equal_impl<infinite_set_tag, infinite_set_tag> {
+        template <typename Xs, typename Ys>
+        static constexpr auto apply(Xs xs, Ys ys)
+        { return and_(is_subset(xs, ys), is_subset(ys, xs)); }
+    };
+
+
+    //////////////////////////////////////////////////////////////////////////
+    // Functor
+    //////////////////////////////////////////////////////////////////////////
+    template <>
+    struct transform_impl<infinite_set_tag> {
+        template <typename Set, typename F>
+        static constexpr auto apply(Set set, F f) {
+            return make_infinite_set([=](auto q) {
+                return f(set.find(compose(q, f)));
+            });
+        }
+    };
+
+    //////////////////////////////////////////////////////////////////////////
+    // Applicative
+    //////////////////////////////////////////////////////////////////////////
+    template <>
+    struct lift_impl<infinite_set_tag> {
+        template <typename X>
+        static constexpr auto apply(X x)
+        { return singleton(x); }
+    };
+
+    template <>
+    struct ap_impl<infinite_set_tag> {
+        template <typename F, typename Set>
+        static constexpr auto apply(F fset, Set set) {
+            return flatten(transform(fset, partial(transform, set)));
+        }
+    };
+
+    //////////////////////////////////////////////////////////////////////////
+    // Monad
+    //////////////////////////////////////////////////////////////////////////
+    template <>
+    struct flatten_impl<infinite_set_tag> {
+        template <typename Set>
+        static constexpr auto apply(Set set) {
+            return make_infinite_set([=](auto p) {
+                return set.find([=](auto set) {
+                    return any_of(set, p);
+                }).find(p);
+            });
+        }
+    };
+
+    //////////////////////////////////////////////////////////////////////////
+    // Searchable
+    //////////////////////////////////////////////////////////////////////////
+    template <>
+    struct find_if_impl<infinite_set_tag> {
+        template <typename Set, typename Pred>
+        static constexpr auto apply(Set set, Pred p) {
+            auto x = set.find(p);
+            return if_(p(x), hana::just(x), hana::nothing);
+        }
+    };
+
+    template <>
+    struct any_of_impl<infinite_set_tag> {
+        template <typename Set, typename Pred>
+        static constexpr auto apply(Set set, Pred p) {
+            return p(set.find(p));
+        }
+    };
+}} // end namespace boost::hana
+
+//////////////////////////////////////////////////////////////////////////////
+// Tests
+//////////////////////////////////////////////////////////////////////////////
+
+#include <boost/hana/any_of.hpp>
+#include <boost/hana/ap.hpp>
+#include <boost/hana/assert.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/find_if.hpp>
+#include <boost/hana/flatten.hpp>
+#include <boost/hana/integral_constant.hpp>
+#include <boost/hana/is_subset.hpp>
+#include <boost/hana/lift.hpp>
+#include <boost/hana/not.hpp>
+#include <boost/hana/optional.hpp>
+#include <boost/hana/plus.hpp>
+#include <boost/hana/transform.hpp>
+#include <boost/hana/union.hpp>
+namespace hana = boost::hana;
+
+
+template <int i>
+constexpr int n = i;
+
+template <int i>
+constexpr auto c = hana::int_c<i>;
+
+int main() {
+    auto f = [](auto n) { return n + hana::int_c<10>; };
+    auto g = [](auto n) { return n + hana::int_c<100>; };
+
+    // union_
+    {
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::union_(singleton(c<0>), singleton(c<0>)),
+            singleton(c<0>)
+        ));
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::union_(singleton(c<0>), singleton(c<1>)),
+            doubleton(c<0>, c<1>)
+        ));
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::union_(singleton(c<0>), doubleton(c<0>, c<1>)),
+            doubleton(c<0>, c<1>)
+        ));
+    }
+
+    // Comparable
+    {
+        // equal
+        {
+            BOOST_HANA_CONSTEXPR_CHECK(hana::equal(singleton(n<0>), singleton(n<0>)));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(singleton(n<0>), singleton(n<1>))));
+
+            BOOST_HANA_CONSTEXPR_CHECK(hana::equal(singleton(n<0>), doubleton(n<0>, n<0>)));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(singleton(n<0>), doubleton(n<0>, n<1>))));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(singleton(n<0>), doubleton(n<1>, n<1>))));
+
+            BOOST_HANA_CONSTEXPR_CHECK(hana::equal(doubleton(n<0>, n<1>), doubleton(n<0>, n<1>)));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::equal(doubleton(n<0>, n<1>), doubleton(n<1>, n<0>)));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(doubleton(n<0>, n<1>), doubleton(n<0>, n<0>))));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(doubleton(n<0>, n<1>), doubleton(n<3>, n<4>))));
+        }
+    }
+
+    // Functor
+    {
+        // transform
+        {
+            BOOST_HANA_CONSTEXPR_CHECK(hana::equal(
+                hana::transform(singleton(n<0>), f),
+                singleton(f(n<0>))
+            ));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::equal(
+                hana::transform(doubleton(n<0>, n<1>), f),
+                doubleton(f(n<0>), f(n<1>))
+            ));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::equal(
+                hana::transform(doubleton(n<0>, n<0>), f),
+                singleton(f(n<0>))
+            ));
+        }
+    }
+
+    // Applicative
+    {
+        // ap
+        {
+            BOOST_HANA_CONSTANT_CHECK(hana::equal(
+                hana::ap(singleton(f), singleton(c<0>)),
+                singleton(f(c<0>))
+            ));
+            BOOST_HANA_CONSTANT_CHECK(hana::equal(
+                hana::ap(singleton(f), doubleton(c<0>, c<1>)),
+                doubleton(f(c<0>), f(c<1>))
+            ));
+
+            BOOST_HANA_CONSTANT_CHECK(hana::equal(
+                hana::ap(doubleton(f, g), singleton(c<0>)),
+                doubleton(f(c<0>), g(c<0>))
+            ));
+            BOOST_HANA_CONSTANT_CHECK(hana::equal(
+                hana::ap(doubleton(f, g), doubleton(c<0>, c<1>)),
+                hana::union_(doubleton(f(c<0>), f(c<1>)),
+                             doubleton(g(c<0>), g(c<1>)))
+            ));
+        }
+
+        // lift
+        {
+            BOOST_HANA_CONSTANT_CHECK(hana::equal(
+                hana::lift<infinite_set_tag>(c<0>),
+                singleton(c<0>)
+            ));
+        }
+    }
+
+    // Monad
+    {
+        // flatten
+        {
+            BOOST_HANA_CONSTANT_CHECK(hana::equal(
+                hana::flatten(singleton(singleton(c<0>))),
+                singleton(c<0>)
+            ));
+            BOOST_HANA_CONSTANT_CHECK(hana::equal(
+                hana::flatten(singleton(doubleton(c<0>, c<1>))),
+                doubleton(c<0>, c<1>)
+            ));
+
+            BOOST_HANA_CONSTANT_CHECK(hana::equal(
+                hana::flatten(doubleton(singleton(c<0>), singleton(c<1>))),
+                doubleton(c<0>, c<1>)
+            ));
+            BOOST_HANA_CONSTANT_CHECK(hana::equal(
+                hana::flatten(doubleton(doubleton(c<0>, c<1>), singleton(c<2>))),
+                hana::union_(doubleton(c<0>, c<1>), singleton(c<2>))
+            ));
+            BOOST_HANA_CONSTANT_CHECK(hana::equal(
+                hana::flatten(doubleton(singleton(c<0>), doubleton(c<1>, c<2>))),
+                hana::union_(doubleton(c<0>, c<1>), singleton(c<2>))
+            ));
+            BOOST_HANA_CONSTANT_CHECK(hana::equal(
+                hana::flatten(doubleton(doubleton(c<0>, c<1>), doubleton(c<2>, c<3>))),
+                hana::union_(doubleton(c<0>, c<1>), doubleton(c<2>, c<3>))
+            ));
+        }
+    }
+
+    // Searchable
+    {
+        // any_of
+        {
+            BOOST_HANA_CONSTEXPR_CHECK(hana::any_of(singleton(n<0>), hana::equal.to(n<0>)));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::any_of(singleton(n<0>), hana::equal.to(n<1>))));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::any_of(doubleton(n<0>, n<1>), hana::equal.to(n<0>)));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::any_of(doubleton(n<0>, n<1>), hana::equal.to(n<1>)));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::any_of(doubleton(n<0>, n<1>), hana::equal.to(n<2>))));
+        }
+
+        // find_if
+        {
+            BOOST_HANA_CONSTANT_CHECK(hana::find_if(singleton(c<0>), hana::equal.to(c<0>)) == hana::just(c<0>));
+            BOOST_HANA_CONSTANT_CHECK(hana::find_if(singleton(c<1>), hana::equal.to(c<0>)) == hana::nothing);
+
+            BOOST_HANA_CONSTANT_CHECK(hana::find_if(doubleton(c<0>, c<1>), hana::equal.to(c<0>)) == hana::just(c<0>));
+            BOOST_HANA_CONSTANT_CHECK(hana::find_if(doubleton(c<0>, c<1>), hana::equal.to(c<1>)) == hana::just(c<1>));
+            BOOST_HANA_CONSTANT_CHECK(hana::find_if(doubleton(c<0>, c<1>), hana::equal.to(c<2>)) == hana::nothing);
+        }
+
+        // is_subset
+        {
+            BOOST_HANA_CONSTEXPR_CHECK(hana::is_subset(singleton(n<0>), singleton(n<0>)));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::is_subset(singleton(n<1>), singleton(n<0>))));
+
+            BOOST_HANA_CONSTEXPR_CHECK(hana::is_subset(singleton(n<0>), doubleton(n<0>, n<1>)));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::is_subset(singleton(n<1>), doubleton(n<0>, n<1>)));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::is_subset(singleton(n<2>), doubleton(n<0>, n<1>))));
+
+            BOOST_HANA_CONSTEXPR_CHECK(hana::is_subset(doubleton(n<0>, n<1>), doubleton(n<0>, n<1>)));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::is_subset(doubleton(n<0>, n<2>), doubleton(n<0>, n<1>))));
+            BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::is_subset(doubleton(n<2>, n<3>), doubleton(n<0>, n<1>))));
+        }
+    }
+}