merge(3p/immer): Subtree merge at 'ad3e3556d' as 'third_party/immer'

Change-Id: I9636a41ad44b4218293833fd3e9456d9b07c731b

third_party/immer/extra/guile/src/immer.cpp

@@ -0,0 +1,153 @@
+//
+// 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
+//
+
+#include <immer/flex_vector.hpp>
+#include <immer/flex_vector_transient.hpp>
+#include <immer/algorithm.hpp>
+#include <scm/scm.hpp>
+#include <iostream>
+
+namespace {
+
+struct guile_heap
+{
+    static void* allocate(std::size_t size)
+    { return scm_gc_malloc(size, "immer"); }
+
+    static void* allocate(std::size_t size, immer::norefs_tag)
+    { return scm_gc_malloc_pointerless(size, "immer"); }
+
+    template <typename ...Tags>
+    static void deallocate(std::size_t size, void* obj, Tags...)
+    { scm_gc_free(obj, size, "immer"); }
+};
+
+using guile_memory = immer::memory_policy<
+    immer::heap_policy<guile_heap>,
+    immer::no_refcount_policy,
+    immer::gc_transience_policy,
+    false>;
+
+template <typename T>
+using guile_ivector = immer::flex_vector<T, guile_memory>;
+
+struct dummy
+{
+    SCM port_ = scm_current_warning_port();
+
+    dummy(dummy&&)
+    { scm_puts("~~ dummy move constructor\n", port_); }
+
+    dummy()
+    { scm_puts("~~ dummy default constructor\n", port_); }
+
+    ~dummy()
+    { scm_puts("~~ dummy finalized\n", port_); }
+
+    void foo()
+    { scm_puts("~~ dummy foo\n", port_); }
+
+    int bar(int x)
+    {
+        auto res = x + 42;
+        scm_puts("~~ dummy bar: ", port_);
+        scm_display(scm::val{res}, port_);
+        scm_newline(port_);
+        return res;
+    }
+};
+
+template <int I>
+void func()
+{
+    auto port = scm_current_warning_port();
+    scm_puts("~~ func", port);
+    scm_display(scm_from_int(I), port);
+    scm_newline(port);
+}
+
+template <typename T = scm::val>
+void init_ivector(std::string type_name = "")
+{
+    using namespace std::string_literals;
+
+    using self_t = guile_ivector<T>;
+    using size_t = typename self_t::size_type;
+
+    auto name = "ivector"s + (type_name.empty() ? ""s : "-" + type_name);
+
+    scm::type<self_t>(name)
+        .constructor([] (scm::args rest) {
+            return self_t(rest.begin(), rest.end());
+        })
+        .maker([] (size_t n, scm::args rest) {
+            return self_t(n, rest ? *rest : scm::val{});
+        })
+        .define("ref", &self_t::operator[])
+        .define("length", &self_t::size)
+        .define("set", [] (const self_t& v, size_t i, scm::val x) {
+            return v.set(i, x);
+        })
+        .define("update", [] (const self_t& v, size_t i, scm::val fn) {
+            return v.update(i, fn);
+        })
+        .define("push", [] (const self_t& v, scm::val x) {
+            return v.push_back(x);
+        })
+        .define("take", [] (const self_t& v, size_t s) {
+            return v.take(s);
+        })
+        .define("drop", [] (const self_t& v, size_t s) {
+            return v.drop(s);
+        })
+        .define("append", [] (self_t v, scm::args rest) {
+            for (auto x : rest)
+                v = v + x;
+            return v;
+        })
+        .define("fold", [] (scm::val fn, scm::val first, const self_t& v) {
+            return immer::accumulate(v, first, fn);
+        })
+        ;
+}
+
+} // anonymous namespace
+
+struct bar_tag_t {};
+
+extern "C"
+void init_immer()
+{
+    scm::type<dummy>("dummy")
+        .constructor()
+        .finalizer()
+        .define("foo", &dummy::foo)
+        .define("bar", &dummy::bar);
+
+    scm::group()
+        .define("func1", func<1>);
+
+    scm::group<bar_tag_t>()
+        .define("func2", func<2>)
+        .define("func3", &dummy::bar);
+
+    scm::group("foo")
+        .define("func1", func<1>);
+
+    init_ivector();
+    init_ivector<std::uint8_t>("u8");
+    init_ivector<std::uint16_t>("u16");
+    init_ivector<std::uint32_t>("u32");
+    init_ivector<std::uint64_t>("u64");
+    init_ivector<std::int8_t>("s8");
+    init_ivector<std::int16_t>("s16");
+    init_ivector<std::int32_t>("s32");
+    init_ivector<std::int64_t>("s64");
+    init_ivector<float>("f32");
+    init_ivector<double>("f64");
+}