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暂时写这么点

MDB/imm_mongodb/bsoncxx/builder/basic/impl.hpp

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+// Copyright 2015 MongoDB Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <bsoncxx/builder/basic/sub_array.hpp>
+#include <bsoncxx/builder/basic/sub_document.hpp>
+#include <bsoncxx/util/functor.hpp>
+
+#include <bsoncxx/config/prelude.hpp>
+
+namespace bsoncxx {
+BSONCXX_INLINE_NAMESPACE_BEGIN
+namespace builder {
+namespace basic {
+namespace impl {
+
+template <typename T>
+using takes_document = typename util::is_functor<T, void(sub_document)>;
+
+template <typename T>
+using takes_array = typename util::is_functor<T, void(sub_array)>;
+
+template <typename T>
+BSONCXX_INLINE typename std::enable_if<takes_document<T>::value, void>::type generic_append(
+    core* core, T&& func) {
+    core->open_document();
+    func(sub_document(core));
+    core->close_document();
+}
+
+template <typename T>
+BSONCXX_INLINE typename std::enable_if<takes_array<T>::value, void>::type generic_append(core* core,
+                                                                                         T&& func) {
+    core->open_array();
+    func(sub_array(core));
+    core->close_array();
+}
+
+template <typename T>
+BSONCXX_INLINE
+    typename std::enable_if<!takes_document<T>::value && !takes_array<T>::value, void>::type
+    generic_append(core* core, T&& t) {
+    core->append(std::forward<T>(t));
+}
+
+template <typename T>
+BSONCXX_INLINE void value_append(core* core, T&& t) {
+    generic_append(core, std::forward<T>(t));
+}
+
+}  // namespace impl
+}  // namespace basic
+}  // namespace builder
+BSONCXX_INLINE_NAMESPACE_END
+}  // namespace bsoncxx
+
+#include <bsoncxx/config/postlude.hpp>