key_context.hpp

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// Copyright 2009-present 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/stream/closed_context-fwd.hpp>
#include <bsoncxx/builder/stream/key_context-fwd.hpp>
 
#include <bsoncxx/builder/core.hpp>
#include <bsoncxx/builder/stream/value_context.hpp>
#include <bsoncxx/stdx/string_view.hpp>
#include <bsoncxx/stdx/type_traits.hpp>
 
#include <bsoncxx/config/prelude.hpp>
 
namespace bsoncxx {
namespace v_noabi {
namespace builder {
namespace stream {
 
template <class base>
class key_context {
   public:
    key_context(core* core) : _core(core) {}
 
    template <std::size_t n>
    value_context<key_context> operator<<(const char (&v)[n]) {
        _core->key_view(stdx::string_view{v, n - 1});
        return value_context<key_context>(_core);
    }
 
    value_context<key_context> operator<<(std::string str) {
        _core->key_owned(std::move(str));
        return value_context<key_context>(_core);
    }
 
    value_context<key_context> operator<<(stdx::string_view str) {
        _core->key_view(std::move(str));
        return value_context<key_context>(_core);
    }
 
    template <typename T>
    detail::requires_t<key_context&, detail::is_invocable<T, key_context>>  //
    operator<<(T&& func) {
        detail::invoke(std::forward<T>(func), *this);
        return *this;
    }
 
    template <typename T>
    detail::requires_t<bsoncxx::v_noabi::document::value,
                       std::is_same<base, closed_context>,
                       detail::is_alike<T, finalize_type>>
    operator<<(T&&) {
        return _core->extract_document();
    }
 
    key_context operator<<(concatenate_doc doc) {
        _core->concatenate(doc);
        return *this;
    }
 
    base operator<<(const close_document_type) {
        _core->close_document();
        return unwrap();
    }
 
    operator key_context<>() {
        return key_context<>(_core);
    }
 
   private:
    base unwrap() {
        return base(_core);
    }
 
    core* _core;
};
 
}  // namespace stream
}  // namespace builder
}  // namespace v_noabi
}  // namespace bsoncxx
 
#include <bsoncxx/config/postlude.hpp>