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authorVincent Ambo <mail@tazj.in>2020-07-15T07·20+0100
committerVincent Ambo <mail@tazj.in>2020-07-15T07·23+0100
commit1213b086a1015a662ab7ebd658f784534fd3116a (patch)
treed3bc8f3b7f40b8b60f0ef6fbd649cf765f4fdfb6 /third_party/immer/extra/guile/scm/detail/subr_wrapper.hpp
parent1390827b9ea1e04bc9863e48930bfd16db3b716e (diff)
parent7f19d641647ac4ef313ed88d6b5c140983ce5436 (diff)
merge(3p/immer): Subtree merge at 'ad3e3556d' as 'third_party/immer' r/1299
Change-Id: I9636a41ad44b4218293833fd3e9456d9b07c731b
Diffstat (limited to 'third_party/immer/extra/guile/scm/detail/subr_wrapper.hpp')
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diff --git a/third_party/immer/extra/guile/scm/detail/subr_wrapper.hpp b/third_party/immer/extra/guile/scm/detail/subr_wrapper.hpp
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+++ b/third_party/immer/extra/guile/scm/detail/subr_wrapper.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 <scm/detail/invoke.hpp>
+#include <scm/detail/function_args.hpp>
+#include <scm/detail/convert.hpp>
+
+namespace scm {
+namespace detail {
+
+// this anonymous namespace should help avoiding registration clashes
+// among translation units.
+namespace {
+
+template <typename Tag, typename R, typename Fn>
+auto subr_wrapper_impl(Fn fn, pack<R>, pack<>)
+{
+    check_call_once<Tag, Fn>();
+    static const Fn fn_ = fn;
+    return [] () -> SCM { return to_scm(invoke(fn_)); };
+}
+template <typename Tag, typename Fn, typename R, typename T1>
+auto subr_wrapper_impl(Fn fn, pack<R>, pack<T1>)
+{
+    check_call_once<Tag, Fn>();
+    static const Fn fn_ = fn;
+    return [] (SCM a1) -> SCM {
+        return to_scm(invoke(fn_, to_cpp<T1>(a1)));
+    };
+}
+template <typename Tag, typename Fn, typename R, typename T1, typename T2>
+auto subr_wrapper_impl(Fn fn, pack<R>, pack<T1, T2>)
+{
+    check_call_once<Tag, Fn>();
+    static const Fn fn_ = fn;
+    return [] (SCM a1, SCM a2) -> SCM {
+        return to_scm(invoke(fn_, to_cpp<T1>(a1), to_cpp<T2>(a2)));
+    };
+}
+template <typename Tag, typename Fn, typename R, typename T1, typename T2,
+          typename T3>
+auto subr_wrapper_impl(Fn fn, pack<R>, pack<T1, T2, T3>)
+{
+    check_call_once<Tag, Fn>();
+    static const Fn fn_ = fn;
+    return [] (SCM a1, SCM a2, SCM a3) -> SCM {
+        return to_scm(invoke(fn_, to_cpp<T1>(a1), to_cpp<T2>(a2),
+                             to_cpp<T3>(a3)));
+    };
+}
+
+template <typename Tag, typename Fn>
+auto subr_wrapper_impl(Fn fn, pack<void>, pack<>)
+{
+    check_call_once<Tag, Fn>();
+    static const Fn fn_ = fn;
+    return [] () -> SCM { invoke(fn_); return SCM_UNSPECIFIED; };
+}
+template <typename Tag, typename Fn, typename T1>
+auto subr_wrapper_impl(Fn fn, pack<void>, pack<T1>)
+{
+    check_call_once<Tag, Fn>();
+    static const Fn fn_ = fn;
+    return [] (SCM a1) -> SCM {
+        invoke(fn_, to_cpp<T1>(a1)); return SCM_UNSPECIFIED;
+    };
+}
+template <typename Tag, typename Fn, typename T1, typename T2>
+auto subr_wrapper_impl(Fn fn, pack<void>, pack<T1, T2>)
+{
+    check_call_once<Tag, Fn>();
+    static const Fn fn_ = fn;
+    return [] (SCM a1, SCM a2) -> SCM {
+        invoke(fn_, to_cpp<T1>(a1), to_cpp<T2>(a2));
+        return SCM_UNSPECIFIED;
+    };
+}
+template <typename Tag, typename Fn, typename T1, typename T2, typename T3>
+auto subr_wrapper_impl(Fn fn, pack<void>, pack<T1, T2, T3>)
+{
+    check_call_once<Tag, Fn>();
+    static const Fn fn_ = fn;
+    return [] (SCM a1, SCM a2, SCM a3) -> SCM {
+        invoke(fn_, to_cpp<T1>(a1), to_cpp<T2>(a2), to_cpp<T3>(a3));
+        return SCM_UNSPECIFIED;
+    };
+}
+
+template <typename Tag, typename Fn, typename... Args>
+auto subr_wrapper_aux(Fn fn, pack<Args...>)
+{
+    return subr_wrapper_impl<Tag>(
+        fn, pack<std::result_of_t<Fn(Args...)>>{}, pack<Args...>{});
+}
+
+template <typename Tag, typename Fn>
+auto subr_wrapper(Fn fn)
+{
+    return subr_wrapper_aux<Tag>(fn, function_args_t<Fn>{});
+}
+
+} // anonymous namespace
+} // namespace detail
+} // namespace scm