Blame SOURCES/boost-1.60-python-regptr.patch

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From f2c465ffa508459216f7093bf95ba001ad994206 Mon Sep 17 00:00:00 2001
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From: vslashg <veloso@verylowsodium.com>
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Date: Mon, 29 Feb 2016 13:33:35 -0500
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Subject: [PATCH] Fix auto-pointer registration in Boost Python 1.60.
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The conditional instantiation magic of maybe_register_pointer_to_python() assumes that use_value_holder and use_back_reference will be one of the boost::mpl::bool_ types, but this assumption is no longer true in Boost 1.60, where they can be standard library bool wrappers instead.
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Explicitly defining these types as mpl::bool_ classes fixes https://github.com/boostorg/python/issues/56.
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---
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 include/boost/python/object/class_metadata.hpp | 12 +++++++-----
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 1 file changed, 7 insertions(+), 5 deletions(-)
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diff --git a/include/boost/python/object/class_metadata.hpp b/include/boost/python/object/class_metadata.hpp
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index c71cf67..5009c17 100644
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--- a/include/boost/python/object/class_metadata.hpp
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+++ b/include/boost/python/object/class_metadata.hpp
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@@ -164,7 +164,7 @@ struct class_metadata
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     >::type held_type;
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     // Determine if the object will be held by value
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-    typedef is_convertible<held_type*,T*> use_value_holder;
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+    typedef mpl::bool_<is_convertible<held_type*,T*>::value> use_value_holder;
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     // Compute the "wrapped type", that is, if held_type is a smart
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     // pointer, we're talking about the pointee.
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@@ -175,10 +175,12 @@ struct class_metadata
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     >::type wrapped;
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     // Determine whether to use a "back-reference holder"
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-    typedef mpl::or_<
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-        has_back_reference<T>
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-      , is_same<held_type_arg,T>
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-      , is_base_and_derived<T,wrapped>
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+    typedef mpl::bool_<
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+        mpl::or_<
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+            has_back_reference<T>
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+          , is_same<held_type_arg,T>
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+          , is_base_and_derived<T,wrapped>
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+        >::value
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     > use_back_reference;
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     // Select the holder.