Squashed 'third_party/immer/' content from commit ad3e3556d

git-subtree-dir: third_party/immer
git-subtree-split: ad3e3556d38bb75966dd24c61a774970a7c7957e

benchmark/config.hpp

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+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#pragma once
+
+#include <nonius.h++>
+
+#include <immer/heap/gc_heap.hpp>
+#include <immer/memory_policy.hpp>
+
+namespace {
+
+NONIUS_PARAM(N, std::size_t{1000})
+
+struct gc_disable
+{
+    gc_disable()
+    {
+#if IMMER_BENCHMARK_DISABLE_GC
+        GC_disable();
+#else
+        GC_gcollect();
+#endif
+    }
+    ~gc_disable()
+    {
+#if IMMER_BENCHMARK_DISABLE_GC
+        GC_enable();
+        GC_gcollect();
+#endif
+    }
+    gc_disable(const gc_disable&) = delete;
+    gc_disable(gc_disable&&) = delete;
+};
+
+template <typename Meter, typename Fn>
+void measure(Meter& m, Fn&& fn)
+{
+    gc_disable guard;
+    return m.measure(std::forward<Fn>(fn));
+}
+
+using def_memory    = immer::default_memory_policy;
+using gc_memory     = immer::memory_policy<immer::heap_policy<immer::gc_heap>, immer::no_refcount_policy>;
+using gcf_memory    = immer::memory_policy<immer::heap_policy<immer::gc_heap>, immer::no_refcount_policy, immer::gc_transience_policy, false>;
+using basic_memory  = immer::memory_policy<immer::heap_policy<immer::cpp_heap>, immer::refcount_policy>;
+using safe_memory   = immer::memory_policy<immer::free_list_heap_policy<immer::cpp_heap>, immer::refcount_policy>;
+using unsafe_memory = immer::memory_policy<immer::unsafe_free_list_heap_policy<immer::cpp_heap>, immer::unsafe_refcount_policy>;
+
+} // anonymous namespace