1 files changed, 0 insertions, 101 deletions
diff --git a/third_party/immer/immer/refcount/refcount_policy.hpp b/third_party/immer/immer/refcount/refcount_policy.hpp
deleted file mode 100644
index a7a282cd13..0000000000
--- a/third_party/immer/immer/refcount/refcount_policy.hpp
+++ /dev/null
@@ -1,101 +0,0 @@
-//
-// 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 <immer/refcount/no_refcount_policy.hpp>
-
-#include <atomic>
-#include <cassert>
-#include <thread>
-#include <utility>
-
-// This has been shamelessly copied from boost...
-#if defined(_MSC_VER) && _MSC_VER >= 1310 &&                                   \
-    (defined(_M_IX86) || defined(_M_X64)) && !defined(__c2__)
-extern "C" void _mm_pause();
-#define IMMER_SMT_PAUSE _mm_pause()
-#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
-#define IMMER_SMT_PAUSE __asm__ __volatile__("rep; nop" : : : "memory")
-#endif
-
-namespace immer {
-
-// This is an atomic spinlock similar to the one used by boost to provide
-// "atomic" shared_ptr operations.  It also does not differ much from the one
-// from libc++ or libstdc++...
-struct spinlock
-{
-    std::atomic_flag v_{};
-
-    bool try_lock() { return !v_.test_and_set(std::memory_order_acquire); }
-
-    void lock()
-    {
-        for (auto k = 0u; !try_lock(); ++k) {
-            if (k < 4)
-                continue;
-#ifdef IMMER_SMT_PAUSE
-            else if (k < 16)
-                IMMER_SMT_PAUSE;
-#endif
-            else
-                std::this_thread::yield();
-        }
-    }
-
-    void unlock() { v_.clear(std::memory_order_release); }
-
-    struct scoped_lock
-    {
-        scoped_lock(const scoped_lock&) = delete;
-        scoped_lock& operator=(const scoped_lock&) = delete;
-
-        explicit scoped_lock(spinlock& sp)
-            : sp_{sp}
-        {
-            sp.lock();
-        }
-
-        ~scoped_lock() { sp_.unlock(); }
-
-    private:
-        spinlock& sp_;
-    };
-};
-
-/*!
- * A reference counting policy implemented using an *atomic* `int`
- * count.  It is **thread-safe**.
- */
-struct refcount_policy
-{
-    using spinlock_type = spinlock;
-
-    mutable std::atomic<int> refcount;
-
-    refcount_policy()
-        : refcount{1} {};
-    refcount_policy(disowned)
-        : refcount{0}
-    {}
-
-    void inc() { refcount.fetch_add(1, std::memory_order_relaxed); }
-
-    bool dec() { return 1 == refcount.fetch_sub(1, std::memory_order_acq_rel); }
-
-    void dec_unsafe()
-    {
-        assert(refcount.load() > 1);
-        refcount.fetch_sub(1, std::memory_order_relaxed);
-    }
-
-    bool unique() { return refcount == 1; }
-};
-
-} // namespace immer